从 Javascript 中的函数创建关联数组
Create associative array from function in Javascript
我有一个函数（如下）过滤作为参数传递给函数的特定频道的数组，然后 returns 针对该频道的不同 ConversationID 的数量：
var conversationsByChannel = function (channel) {
var conversations = transcriptsData.jsonarray
.filter(ConversationID => ConversationID.MessageChannel===channel)
.map(({ConversationID}) => ConversationID);
var distinctConversations = [...new Set(conversations)];
return {[channel]: distinctConversations.length}
};
以下成绩单示例数据：
var transcriptsData = {
"jsonarray": [
{"Type":"trace","MessageID":"aHEeHB0t0hHr7175E07zF8kfVjGLBRMdzD_oYUEHNE71Va3wN0yJv9aBAzkOk6JMZvTBRMzBNCUjCvTRuxrAVA","MessageTime":"2019-08-07T09:19:45.342Z","MessageChannel":"facebook","MessageSenderID":"2826538590752448","MessageSenderName":"Sean Betts","ConversationID":"2826538590752448-530667464425015","MessageText":"Symptoms","MessageRecipientID":"530667464425015","QuickReplyDisplayText":null,"QuickReplyPayload":null,"Question":"[\"What are the symptoms of schizophrenia?\"]","Answer":"\nThe symptoms of schizophrenia are usually classified into:\n\n* Positive symptoms – any change in behaviour or thoughts, such as hallucinations or delusions\n* Negative symptoms – a withdrawal or lack of function that you would not usually expect to see in a healthy person; for example, people with schizophrenia often appear emotionless and flat","FollowUpPrompts":"[{\"displayOrder\":0,\"qnaId\":150,\"qna\":null,\"displayText\":\"Related Issues\"}]"}
,{"Type":"trace","MessageID":"hLgPSyBP-cAPdKYJ-bFHUckfVjGLBRMdzD_oYUEHNE4bJsq-K4GZvHL9m6guIMtShXFRY-XoxTMdZVBLLZBGDQ","MessageTime":"2019-08-07T09:19:39.582Z","MessageChannel":"facebook","MessageSenderID":"2826538590752448","MessageSenderName":"Sean Betts","ConversationID":"2826538590752448-530667464425015","MessageText":"Schizophrenia","MessageRecipientID":"530667464425015","QuickReplyDisplayText":null,"QuickReplyPayload":null,"Question":"[\"What is schizophrenia?\"]","Answer":"\nViews on schizophrenia have changed over the years. Lots of people question whether it's really a distinct condition, or actually a few different conditions that overlap. But you may still be given this diagnosis if you experience symptoms such as:\n\n* psychosis (such as hallucinations or delusions)\n\n* disorganised thinking and speech\n\n* feeling disconnected from your feelings\n\n* difficulty concentrating\n\n* wanting to avoid people\n\n* a lack of interest in things\n\n* not wanting to look after yourself.\n\nBecause psychiatric experts disagree about what schizophrenia is, some people argue that this term shouldn't be used at all. Others think the name of the condition doesn't matter, and prefer to just focus on helping you manage your symptoms and meeting your individual needs.","FollowUpPrompts":"[{\"displayOrder\":0,\"qnaId\":147,\"qna\":null,\"displayText\":\"Prevalence\"},{\"displayOrder\":0,\"qnaId\":148,\"qna\":null,\"displayText\":\"Causes\"},{\"displayOrder\":0,\"qnaId\":149,\"qna\":null,\"displayText\":\"Symptoms\"},{\"displayOrder\":0,\"qnaId\":150,\"qna\":null,\"displayText\":\"Related Issues\"}]"}
,{"Type":"trace","MessageID":"893qgqa3cR9","MessageTime":"2019-08-07T09:19:27.853Z","MessageChannel":"facebook","MessageSenderID":"2826538590752448","MessageSenderName":"Sean Betts","ConversationID":"2826538590752448-530667464425015","MessageText":"WHAT_IS_MENTAL_HEALTH","MessageRecipientID":"530667464425015","QuickReplyDisplayText":"Mental Health","QuickReplyPayload":"WHAT_IS_MENTAL_HEALTH","Question":"[\"What is mental health?\"]","Answer":"\nIn many ways, Mental Health is just like Physical Health: Everybody has it and we need to take care of it.\n\nGood Mental Health means being generally able to think, feel and react in the ways that you need and want to live your life. But if you go through a period of poor Mental Health you might find the ways you're frequently thinking, feeling or reacting become difficult, or even impossible, to cope with. This can feel just as bad as a physical illness, or even worse.\n\nMental Health problems affect around one in four people in any given year. They range from common problems, such as depression and anxiety, to rarer problems such as schizophrenia and bipolar disorder.","FollowUpPrompts":"[{\"displayOrder\":0,\"qnaId\":123,\"qna\":null,\"displayText\":\"What Types Are There?\"}]"}
,{"Type":"trace","MessageID":"V2VFDEjUb_w3uoJwMwdHYckfVjGLBRMdzD_oYUEHNE7ufPEJdVsZzedQSKsLniMtd9-f_Ngy-mk-tNd1w3X33w","MessageTime":"2019-08-07T09:19:57.637Z","MessageChannel":"facebook","MessageSenderID":"2826538590752448","MessageSenderName":"Sean Betts","ConversationID":"2826538590752448-530667464425015","MessageText":"Suicide","MessageRecipientID":"530667464425015","QuickReplyDisplayText":null,"QuickReplyPayload":null,"Question":"[\"How common is suicide?\"]","Answer":"\nApproximately 6.7% of people have attempted suicide during their lifetime in the UK","FollowUpPrompts":"[{\"displayOrder\":0,\"qnaId\":195,\"qna\":null,\"displayText\":\"Get Help\"}]"}
,{"Type":"trace","MessageID":"V2VFDEjUb_w3uoJwMwdHYckfVjGLBRMdzD_oYUEHNE7ufPEJdVsZzedQSKsLniMtd9-f_Ngy-mk-tNd1w3X33w","MessageTime":"2019-08-07T09:19:57.637Z","MessageChannel":"facebook","MessageSenderID":"2826538590752448","MessageSenderName":"Sean Betts","ConversationID":"2826538590752448-530667464425015","MessageText":"Suicide","MessageRecipientID":"530667464425015","QuickReplyDisplayText":null,"QuickReplyPayload":null,"Question":"[\"How common is suicide?\"]","Answer":"\nApproximately 6.7% of people have attempted suicide during their lifetime in the UK","FollowUpPrompts":"[{\"displayOrder\":0,\"qnaId\":195,\"qna\":null,\"displayText\":\"Get Help\"}]"}
,{"Type":"trace","MessageID":"RLOUlqwIcO4zSY4zHgWG78kfVjGLBRMdzD_oYUEHNE7gRJSePak9st7_nIIgw3OWXLvAMm4hMXeJ5kFnlIavpQ","MessageTime":"2019-08-07T09:20:04.294Z","MessageChannel":"facebook","MessageSenderID":"2826538590752448","MessageSenderName":"Sean Betts","ConversationID":"2826538590752448-530667464425015","MessageText":"Get Help","MessageRecipientID":"530667464425015","QuickReplyDisplayText":null,"QuickReplyPayload":null,"Question":"[\"Help me\"]","Answer":"\nBeing in a crisis can be very frightening. If you are worried about your safety, thinking of self-harm or feeling suicidal please get some help and support ASAP.\n\nWhen you're in a criss due to Mental Health problems or struggling to deal with your NeuroDiversity it can be difficult to know what to do. Everyone is deserving of support and it's vitally important that you get some when in crisis.\n\nPlease follow this link for details of where you can get help:\n\nhttps://www.mihnd.co.uk/crisis","FollowUpPrompts":"[{\"displayOrder\":0,\"qnaId\":196,\"qna\":null,\"displayText\":\"Help Yourself\"}]"}
]
};
这在为单个频道创建关联数组方面效果很好，并将 return 以下内容（使用 Facebook 作为示例频道）：
{facebook:1}
我想做的是使用此函数创建一个关联数组，其中包含所有频道和 ConversationID 的数量 key:value 对。例如：
{facebook:1, webchat:1, slack:1}
我一直在尝试各种技术来 运行 函数并组合 returned 数组，但除了将键设置为索引值的关联数组之外别无他法根据以下内容：
0:{facebook:1}, 1:{webchat:1}, 2:{slack:1}
我相信这是因为我在函数中使用花括号 return 我的数组，但找不到没有它们的函数工作方式。
类似于：
var transcriptsData = {
"jsonarray": [
{"Type":"trace","MessageID":"aHEeHB0t0hHr7175E07zF8kfVjGLBRMdzD_oYUEHNE71Va3wN0yJv9aBAzkOk6JMZvTBRMzBNCUjCvTRuxrAVA","MessageTime":"2019-08-07T09:19:45.342Z","MessageChannel":"facebook","MessageSenderID":"2826538590752448","MessageSenderName":"Sean Betts","ConversationID":"2826538590752448-530667464425015","MessageText":"Symptoms","MessageRecipientID":"530667464425015","QuickReplyDisplayText":null,"QuickReplyPayload":null,"Question":"[\"What are the symptoms of schizophrenia?\"]","Answer":"\nThe symptoms of schizophrenia are usually classified into:\n\n* Positive symptoms – any change in behaviour or thoughts, such as hallucinations or delusions\n* Negative symptoms – a withdrawal or lack of function that you would not usually expect to see in a healthy person; for example, people with schizophrenia often appear emotionless and flat","FollowUpPrompts":"[{\"displayOrder\":0,\"qnaId\":150,\"qna\":null,\"displayText\":\"Related Issues\"}]"}
,{"Type":"trace","MessageID":"hLgPSyBP-cAPdKYJ-bFHUckfVjGLBRMdzD_oYUEHNE4bJsq-K4GZvHL9m6guIMtShXFRY-XoxTMdZVBLLZBGDQ","MessageTime":"2019-08-07T09:19:39.582Z","MessageChannel":"facebook","MessageSenderID":"2826538590752448","MessageSenderName":"Sean Betts","ConversationID":"2826538590752448-530667464425015","MessageText":"Schizophrenia","MessageRecipientID":"530667464425015","QuickReplyDisplayText":null,"QuickReplyPayload":null,"Question":"[\"What is schizophrenia?\"]","Answer":"\nViews on schizophrenia have changed over the years. Lots of people question whether it's really a distinct condition, or actually a few different conditions that overlap. But you may still be given this diagnosis if you experience symptoms such as:\n\n* psychosis (such as hallucinations or delusions)\n\n* disorganised thinking and speech\n\n* feeling disconnected from your feelings\n\n* difficulty concentrating\n\n* wanting to avoid people\n\n* a lack of interest in things\n\n* not wanting to look after yourself.\n\nBecause psychiatric experts disagree about what schizophrenia is, some people argue that this term shouldn't be used at all. Others think the name of the condition doesn't matter, and prefer to just focus on helping you manage your symptoms and meeting your individual needs.","FollowUpPrompts":"[{\"displayOrder\":0,\"qnaId\":147,\"qna\":null,\"displayText\":\"Prevalence\"},{\"displayOrder\":0,\"qnaId\":148,\"qna\":null,\"displayText\":\"Causes\"},{\"displayOrder\":0,\"qnaId\":149,\"qna\":null,\"displayText\":\"Symptoms\"},{\"displayOrder\":0,\"qnaId\":150,\"qna\":null,\"displayText\":\"Related Issues\"}]"}
,{"Type":"trace","MessageID":"893qgqa3cR9","MessageTime":"2019-08-07T09:19:27.853Z","MessageChannel":"facebook","MessageSenderID":"2826538590752448","MessageSenderName":"Sean Betts","ConversationID":"2826538590752448-530667464425015","MessageText":"WHAT_IS_MENTAL_HEALTH","MessageRecipientID":"530667464425015","QuickReplyDisplayText":"Mental Health","QuickReplyPayload":"WHAT_IS_MENTAL_HEALTH","Question":"[\"What is mental health?\"]","Answer":"\nIn many ways, Mental Health is just like Physical Health: Everybody has it and we need to take care of it.\n\nGood Mental Health means being generally able to think, feel and react in the ways that you need and want to live your life. But if you go through a period of poor Mental Health you might find the ways you're frequently thinking, feeling or reacting become difficult, or even impossible, to cope with. This can feel just as bad as a physical illness, or even worse.\n\nMental Health problems affect around one in four people in any given year. They range from common problems, such as depression and anxiety, to rarer problems such as schizophrenia and bipolar disorder.","FollowUpPrompts":"[{\"displayOrder\":0,\"qnaId\":123,\"qna\":null,\"displayText\":\"What Types Are There?\"}]"}
,{"Type":"trace","MessageID":"V2VFDEjUb_w3uoJwMwdHYckfVjGLBRMdzD_oYUEHNE7ufPEJdVsZzedQSKsLniMtd9-f_Ngy-mk-tNd1w3X33w","MessageTime":"2019-08-07T09:19:57.637Z","MessageChannel":"facebook","MessageSenderID":"2826538590752448","MessageSenderName":"Sean Betts","ConversationID":"2826538590752448-530667464425015","MessageText":"Suicide","MessageRecipientID":"530667464425015","QuickReplyDisplayText":null,"QuickReplyPayload":null,"Question":"[\"How common is suicide?\"]","Answer":"\nApproximately 6.7% of people have attempted suicide during their lifetime in the UK","FollowUpPrompts":"[{\"displayOrder\":0,\"qnaId\":195,\"qna\":null,\"displayText\":\"Get Help\"}]"}
,{"Type":"trace","MessageID":"V2VFDEjUb_w3uoJwMwdHYckfVjGLBRMdzD_oYUEHNE7ufPEJdVsZzedQSKsLniMtd9-f_Ngy-mk-tNd1w3X33w","MessageTime":"2019-08-07T09:19:57.637Z","MessageChannel":"facebook","MessageSenderID":"2826538590752448","MessageSenderName":"Sean Betts","ConversationID":"2826538590752448-530667464425015","MessageText":"Suicide","MessageRecipientID":"530667464425015","QuickReplyDisplayText":null,"QuickReplyPayload":null,"Question":"[\"How common is suicide?\"]","Answer":"\nApproximately 6.7% of people have attempted suicide during their lifetime in the UK","FollowUpPrompts":"[{\"displayOrder\":0,\"qnaId\":195,\"qna\":null,\"displayText\":\"Get Help\"}]"}
,{"Type":"trace","MessageID":"RLOUlqwIcO4zSY4zHgWG78kfVjGLBRMdzD_oYUEHNE7gRJSePak9st7_nIIgw3OWXLvAMm4hMXeJ5kFnlIavpQ","MessageTime":"2019-08-07T09:20:04.294Z","MessageChannel":"facebook","MessageSenderID":"2826538590752448","MessageSenderName":"Sean Betts","ConversationID":"2826538590752448-530667464425015","MessageText":"Get Help","MessageRecipientID":"530667464425015","QuickReplyDisplayText":null,"QuickReplyPayload":null,"Question":"[\"Help me\"]","Answer":"\nBeing in a crisis can be very frightening. If you are worried about your safety, thinking of self-harm or feeling suicidal please get some help and support ASAP.\n\nWhen you're in a criss due to Mental Health problems or struggling to deal with your NeuroDiversity it can be difficult to know what to do. Everyone is deserving of support and it's vitally important that you get some when in crisis.\n\nPlease follow this link for details of where you can get help:\n\nhttps://www.mihnd.co.uk/crisis","FollowUpPrompts":"[{\"displayOrder\":0,\"qnaId\":196,\"qna\":null,\"displayText\":\"Help Yourself\"}]"}
]
};
var groupBy = function(arr, prop) {
return arr.reduce(function(groups, item) {
const val = item[prop]
groups[val] = groups[val] || []
groups[val].push(item)
return groups
}, {})
}
var conversationsByChannel = function () {
var conversations = groupBy(transcriptsData.jsonarray,'MessageChannel');
for (var p in conversations) {
conversations[p] = conversations[p].length;
}
return conversations;
};
console.log(conversationsByChannel());
这是计算数组中值出现次数的经典方法：
var transcriptsData = {
"jsonarray": [
{ "MessageChannel" : "channel1", "ConversationID" : "11111" },
{ "MessageChannel" : "channel1", "ConversationID" : "22222" },
{ "MessageChannel" : "channel1", "ConversationID" : "22222" },
{ "MessageChannel" : "channel2", "ConversationID" : "11111" },
{ "MessageChannel" : "channel2", "ConversationID" : "11111" },
{ "MessageChannel" : "channel2", "ConversationID" : "33333" },
{ "MessageChannel" : "channel2", "ConversationID" : "44444" }
]
};
function getConversationsByChannel (data, filterValue) {
// Note: Omit filterValue to process all channels
const channels = {};
// Loops through the data to build the `channels` object
data.jsonarray.forEach(item => {
const channel = item.MessageChannel, id = item.ConversationID;
// Makes sure there is no filter, or channel matches filter, before proceeding
if(!filterValue || filterValue == channel){
if(!channels[channel]){
// Adds a property to the `channels` object.
// Its value is an array including one item: the ConversationID.
channels[channel] = [id];
}
else if(!channels[channel].includes(id)){
// Add a new ConversationID to the array for this channel
channels[channel].push(id);
}
}
});
// Replaces the property's value with a number
// indicating the number of unique conversations
for(channel in channels){
// Uses `for...in` to loop through object properties
channels[channel] = channels[channel].length;
}
// Returns the `channels` object
return channels;
};
console.log("Count of conversations for all channels:");
console.log(getConversationsByChannel(transcriptsData));
// Logs { "channel1": 2, "channel2": 3 }
console.log("Count of conversations for 'channel1' only:");
console.log(getConversationsByChannel(transcriptsData, "channel1"));
// Logs { "channel1": 2 }
我有一个函数（如下）过滤作为参数传递给函数的特定频道的数组，然后 returns 针对该频道的不同 ConversationID 的数量：
var conversationsByChannel = function (channel) {
var conversations = transcriptsData.jsonarray
.filter(ConversationID => ConversationID.MessageChannel===channel)
.map(({ConversationID}) => ConversationID);
var distinctConversations = [...new Set(conversations)];
return {[channel]: distinctConversations.length}
};
以下成绩单示例数据：
var transcriptsData = {
"jsonarray": [
{"Type":"trace","MessageID":"aHEeHB0t0hHr7175E07zF8kfVjGLBRMdzD_oYUEHNE71Va3wN0yJv9aBAzkOk6JMZvTBRMzBNCUjCvTRuxrAVA","MessageTime":"2019-08-07T09:19:45.342Z","MessageChannel":"facebook","MessageSenderID":"2826538590752448","MessageSenderName":"Sean Betts","ConversationID":"2826538590752448-530667464425015","MessageText":"Symptoms","MessageRecipientID":"530667464425015","QuickReplyDisplayText":null,"QuickReplyPayload":null,"Question":"[\"What are the symptoms of schizophrenia?\"]","Answer":"\nThe symptoms of schizophrenia are usually classified into:\n\n* Positive symptoms – any change in behaviour or thoughts, such as hallucinations or delusions\n* Negative symptoms – a withdrawal or lack of function that you would not usually expect to see in a healthy person; for example, people with schizophrenia often appear emotionless and flat","FollowUpPrompts":"[{\"displayOrder\":0,\"qnaId\":150,\"qna\":null,\"displayText\":\"Related Issues\"}]"}
,{"Type":"trace","MessageID":"hLgPSyBP-cAPdKYJ-bFHUckfVjGLBRMdzD_oYUEHNE4bJsq-K4GZvHL9m6guIMtShXFRY-XoxTMdZVBLLZBGDQ","MessageTime":"2019-08-07T09:19:39.582Z","MessageChannel":"facebook","MessageSenderID":"2826538590752448","MessageSenderName":"Sean Betts","ConversationID":"2826538590752448-530667464425015","MessageText":"Schizophrenia","MessageRecipientID":"530667464425015","QuickReplyDisplayText":null,"QuickReplyPayload":null,"Question":"[\"What is schizophrenia?\"]","Answer":"\nViews on schizophrenia have changed over the years. Lots of people question whether it's really a distinct condition, or actually a few different conditions that overlap. But you may still be given this diagnosis if you experience symptoms such as:\n\n* psychosis (such as hallucinations or delusions)\n\n* disorganised thinking and speech\n\n* feeling disconnected from your feelings\n\n* difficulty concentrating\n\n* wanting to avoid people\n\n* a lack of interest in things\n\n* not wanting to look after yourself.\n\nBecause psychiatric experts disagree about what schizophrenia is, some people argue that this term shouldn't be used at all. Others think the name of the condition doesn't matter, and prefer to just focus on helping you manage your symptoms and meeting your individual needs.","FollowUpPrompts":"[{\"displayOrder\":0,\"qnaId\":147,\"qna\":null,\"displayText\":\"Prevalence\"},{\"displayOrder\":0,\"qnaId\":148,\"qna\":null,\"displayText\":\"Causes\"},{\"displayOrder\":0,\"qnaId\":149,\"qna\":null,\"displayText\":\"Symptoms\"},{\"displayOrder\":0,\"qnaId\":150,\"qna\":null,\"displayText\":\"Related Issues\"}]"}
,{"Type":"trace","MessageID":"893qgqa3cR9","MessageTime":"2019-08-07T09:19:27.853Z","MessageChannel":"facebook","MessageSenderID":"2826538590752448","MessageSenderName":"Sean Betts","ConversationID":"2826538590752448-530667464425015","MessageText":"WHAT_IS_MENTAL_HEALTH","MessageRecipientID":"530667464425015","QuickReplyDisplayText":"Mental Health","QuickReplyPayload":"WHAT_IS_MENTAL_HEALTH","Question":"[\"What is mental health?\"]","Answer":"\nIn many ways, Mental Health is just like Physical Health: Everybody has it and we need to take care of it.\n\nGood Mental Health means being generally able to think, feel and react in the ways that you need and want to live your life. But if you go through a period of poor Mental Health you might find the ways you're frequently thinking, feeling or reacting become difficult, or even impossible, to cope with. This can feel just as bad as a physical illness, or even worse.\n\nMental Health problems affect around one in four people in any given year. They range from common problems, such as depression and anxiety, to rarer problems such as schizophrenia and bipolar disorder.","FollowUpPrompts":"[{\"displayOrder\":0,\"qnaId\":123,\"qna\":null,\"displayText\":\"What Types Are There?\"}]"}
,{"Type":"trace","MessageID":"V2VFDEjUb_w3uoJwMwdHYckfVjGLBRMdzD_oYUEHNE7ufPEJdVsZzedQSKsLniMtd9-f_Ngy-mk-tNd1w3X33w","MessageTime":"2019-08-07T09:19:57.637Z","MessageChannel":"facebook","MessageSenderID":"2826538590752448","MessageSenderName":"Sean Betts","ConversationID":"2826538590752448-530667464425015","MessageText":"Suicide","MessageRecipientID":"530667464425015","QuickReplyDisplayText":null,"QuickReplyPayload":null,"Question":"[\"How common is suicide?\"]","Answer":"\nApproximately 6.7% of people have attempted suicide during their lifetime in the UK","FollowUpPrompts":"[{\"displayOrder\":0,\"qnaId\":195,\"qna\":null,\"displayText\":\"Get Help\"}]"}
,{"Type":"trace","MessageID":"V2VFDEjUb_w3uoJwMwdHYckfVjGLBRMdzD_oYUEHNE7ufPEJdVsZzedQSKsLniMtd9-f_Ngy-mk-tNd1w3X33w","MessageTime":"2019-08-07T09:19:57.637Z","MessageChannel":"facebook","MessageSenderID":"2826538590752448","MessageSenderName":"Sean Betts","ConversationID":"2826538590752448-530667464425015","MessageText":"Suicide","MessageRecipientID":"530667464425015","QuickReplyDisplayText":null,"QuickReplyPayload":null,"Question":"[\"How common is suicide?\"]","Answer":"\nApproximately 6.7% of people have attempted suicide during their lifetime in the UK","FollowUpPrompts":"[{\"displayOrder\":0,\"qnaId\":195,\"qna\":null,\"displayText\":\"Get Help\"}]"}
,{"Type":"trace","MessageID":"RLOUlqwIcO4zSY4zHgWG78kfVjGLBRMdzD_oYUEHNE7gRJSePak9st7_nIIgw3OWXLvAMm4hMXeJ5kFnlIavpQ","MessageTime":"2019-08-07T09:20:04.294Z","MessageChannel":"facebook","MessageSenderID":"2826538590752448","MessageSenderName":"Sean Betts","ConversationID":"2826538590752448-530667464425015","MessageText":"Get Help","MessageRecipientID":"530667464425015","QuickReplyDisplayText":null,"QuickReplyPayload":null,"Question":"[\"Help me\"]","Answer":"\nBeing in a crisis can be very frightening. If you are worried about your safety, thinking of self-harm or feeling suicidal please get some help and support ASAP.\n\nWhen you're in a criss due to Mental Health problems or struggling to deal with your NeuroDiversity it can be difficult to know what to do. Everyone is deserving of support and it's vitally important that you get some when in crisis.\n\nPlease follow this link for details of where you can get help:\n\nhttps://www.mihnd.co.uk/crisis","FollowUpPrompts":"[{\"displayOrder\":0,\"qnaId\":196,\"qna\":null,\"displayText\":\"Help Yourself\"}]"}
]
};
这在为单个频道创建关联数组方面效果很好，并将 return 以下内容（使用 Facebook 作为示例频道）：
{facebook:1}
我想做的是使用此函数创建一个关联数组，其中包含所有频道和 ConversationID 的数量 key:value 对。例如：
{facebook:1, webchat:1, slack:1}
我一直在尝试各种技术来 运行 函数并组合 returned 数组，但除了将键设置为索引值的关联数组之外别无他法根据以下内容：
0:{facebook:1}, 1:{webchat:1}, 2:{slack:1}
我相信这是因为我在函数中使用花括号 return 我的数组，但找不到没有它们的函数工作方式。
类似于：
var transcriptsData = {
"jsonarray": [
{"Type":"trace","MessageID":"aHEeHB0t0hHr7175E07zF8kfVjGLBRMdzD_oYUEHNE71Va3wN0yJv9aBAzkOk6JMZvTBRMzBNCUjCvTRuxrAVA","MessageTime":"2019-08-07T09:19:45.342Z","MessageChannel":"facebook","MessageSenderID":"2826538590752448","MessageSenderName":"Sean Betts","ConversationID":"2826538590752448-530667464425015","MessageText":"Symptoms","MessageRecipientID":"530667464425015","QuickReplyDisplayText":null,"QuickReplyPayload":null,"Question":"[\"What are the symptoms of schizophrenia?\"]","Answer":"\nThe symptoms of schizophrenia are usually classified into:\n\n* Positive symptoms – any change in behaviour or thoughts, such as hallucinations or delusions\n* Negative symptoms – a withdrawal or lack of function that you would not usually expect to see in a healthy person; for example, people with schizophrenia often appear emotionless and flat","FollowUpPrompts":"[{\"displayOrder\":0,\"qnaId\":150,\"qna\":null,\"displayText\":\"Related Issues\"}]"}
,{"Type":"trace","MessageID":"hLgPSyBP-cAPdKYJ-bFHUckfVjGLBRMdzD_oYUEHNE4bJsq-K4GZvHL9m6guIMtShXFRY-XoxTMdZVBLLZBGDQ","MessageTime":"2019-08-07T09:19:39.582Z","MessageChannel":"facebook","MessageSenderID":"2826538590752448","MessageSenderName":"Sean Betts","ConversationID":"2826538590752448-530667464425015","MessageText":"Schizophrenia","MessageRecipientID":"530667464425015","QuickReplyDisplayText":null,"QuickReplyPayload":null,"Question":"[\"What is schizophrenia?\"]","Answer":"\nViews on schizophrenia have changed over the years. Lots of people question whether it's really a distinct condition, or actually a few different conditions that overlap. But you may still be given this diagnosis if you experience symptoms such as:\n\n* psychosis (such as hallucinations or delusions)\n\n* disorganised thinking and speech\n\n* feeling disconnected from your feelings\n\n* difficulty concentrating\n\n* wanting to avoid people\n\n* a lack of interest in things\n\n* not wanting to look after yourself.\n\nBecause psychiatric experts disagree about what schizophrenia is, some people argue that this term shouldn't be used at all. Others think the name of the condition doesn't matter, and prefer to just focus on helping you manage your symptoms and meeting your individual needs.","FollowUpPrompts":"[{\"displayOrder\":0,\"qnaId\":147,\"qna\":null,\"displayText\":\"Prevalence\"},{\"displayOrder\":0,\"qnaId\":148,\"qna\":null,\"displayText\":\"Causes\"},{\"displayOrder\":0,\"qnaId\":149,\"qna\":null,\"displayText\":\"Symptoms\"},{\"displayOrder\":0,\"qnaId\":150,\"qna\":null,\"displayText\":\"Related Issues\"}]"}
,{"Type":"trace","MessageID":"893qgqa3cR9","MessageTime":"2019-08-07T09:19:27.853Z","MessageChannel":"facebook","MessageSenderID":"2826538590752448","MessageSenderName":"Sean Betts","ConversationID":"2826538590752448-530667464425015","MessageText":"WHAT_IS_MENTAL_HEALTH","MessageRecipientID":"530667464425015","QuickReplyDisplayText":"Mental Health","QuickReplyPayload":"WHAT_IS_MENTAL_HEALTH","Question":"[\"What is mental health?\"]","Answer":"\nIn many ways, Mental Health is just like Physical Health: Everybody has it and we need to take care of it.\n\nGood Mental Health means being generally able to think, feel and react in the ways that you need and want to live your life. But if you go through a period of poor Mental Health you might find the ways you're frequently thinking, feeling or reacting become difficult, or even impossible, to cope with. This can feel just as bad as a physical illness, or even worse.\n\nMental Health problems affect around one in four people in any given year. They range from common problems, such as depression and anxiety, to rarer problems such as schizophrenia and bipolar disorder.","FollowUpPrompts":"[{\"displayOrder\":0,\"qnaId\":123,\"qna\":null,\"displayText\":\"What Types Are There?\"}]"}
,{"Type":"trace","MessageID":"V2VFDEjUb_w3uoJwMwdHYckfVjGLBRMdzD_oYUEHNE7ufPEJdVsZzedQSKsLniMtd9-f_Ngy-mk-tNd1w3X33w","MessageTime":"2019-08-07T09:19:57.637Z","MessageChannel":"facebook","MessageSenderID":"2826538590752448","MessageSenderName":"Sean Betts","ConversationID":"2826538590752448-530667464425015","MessageText":"Suicide","MessageRecipientID":"530667464425015","QuickReplyDisplayText":null,"QuickReplyPayload":null,"Question":"[\"How common is suicide?\"]","Answer":"\nApproximately 6.7% of people have attempted suicide during their lifetime in the UK","FollowUpPrompts":"[{\"displayOrder\":0,\"qnaId\":195,\"qna\":null,\"displayText\":\"Get Help\"}]"}
,{"Type":"trace","MessageID":"V2VFDEjUb_w3uoJwMwdHYckfVjGLBRMdzD_oYUEHNE7ufPEJdVsZzedQSKsLniMtd9-f_Ngy-mk-tNd1w3X33w","MessageTime":"2019-08-07T09:19:57.637Z","MessageChannel":"facebook","MessageSenderID":"2826538590752448","MessageSenderName":"Sean Betts","ConversationID":"2826538590752448-530667464425015","MessageText":"Suicide","MessageRecipientID":"530667464425015","QuickReplyDisplayText":null,"QuickReplyPayload":null,"Question":"[\"How common is suicide?\"]","Answer":"\nApproximately 6.7% of people have attempted suicide during their lifetime in the UK","FollowUpPrompts":"[{\"displayOrder\":0,\"qnaId\":195,\"qna\":null,\"displayText\":\"Get Help\"}]"}
,{"Type":"trace","MessageID":"RLOUlqwIcO4zSY4zHgWG78kfVjGLBRMdzD_oYUEHNE7gRJSePak9st7_nIIgw3OWXLvAMm4hMXeJ5kFnlIavpQ","MessageTime":"2019-08-07T09:20:04.294Z","MessageChannel":"facebook","MessageSenderID":"2826538590752448","MessageSenderName":"Sean Betts","ConversationID":"2826538590752448-530667464425015","MessageText":"Get Help","MessageRecipientID":"530667464425015","QuickReplyDisplayText":null,"QuickReplyPayload":null,"Question":"[\"Help me\"]","Answer":"\nBeing in a crisis can be very frightening. If you are worried about your safety, thinking of self-harm or feeling suicidal please get some help and support ASAP.\n\nWhen you're in a criss due to Mental Health problems or struggling to deal with your NeuroDiversity it can be difficult to know what to do. Everyone is deserving of support and it's vitally important that you get some when in crisis.\n\nPlease follow this link for details of where you can get help:\n\nhttps://www.mihnd.co.uk/crisis","FollowUpPrompts":"[{\"displayOrder\":0,\"qnaId\":196,\"qna\":null,\"displayText\":\"Help Yourself\"}]"}
]
};
var groupBy = function(arr, prop) {
return arr.reduce(function(groups, item) {
const val = item[prop]
groups[val] = groups[val] || []
groups[val].push(item)
return groups
}, {})
}
var conversationsByChannel = function () {
var conversations = groupBy(transcriptsData.jsonarray,'MessageChannel');
for (var p in conversations) {
conversations[p] = conversations[p].length;
}
return conversations;
};
console.log(conversationsByChannel());
这是计算数组中值出现次数的经典方法：
var transcriptsData = {
"jsonarray": [
{ "MessageChannel" : "channel1", "ConversationID" : "11111" },
{ "MessageChannel" : "channel1", "ConversationID" : "22222" },
{ "MessageChannel" : "channel1", "ConversationID" : "22222" },
{ "MessageChannel" : "channel2", "ConversationID" : "11111" },
{ "MessageChannel" : "channel2", "ConversationID" : "11111" },
{ "MessageChannel" : "channel2", "ConversationID" : "33333" },
{ "MessageChannel" : "channel2", "ConversationID" : "44444" }
]
};
function getConversationsByChannel (data, filterValue) {
// Note: Omit filterValue to process all channels
const channels = {};
// Loops through the data to build the `channels` object
data.jsonarray.forEach(item => {
const channel = item.MessageChannel, id = item.ConversationID;
// Makes sure there is no filter, or channel matches filter, before proceeding
if(!filterValue || filterValue == channel){
if(!channels[channel]){
// Adds a property to the `channels` object.
// Its value is an array including one item: the ConversationID.
channels[channel] = [id];
}
else if(!channels[channel].includes(id)){
// Add a new ConversationID to the array for this channel
channels[channel].push(id);
}
}
});
// Replaces the property's value with a number
// indicating the number of unique conversations
for(channel in channels){
// Uses `for...in` to loop through object properties
channels[channel] = channels[channel].length;
}
// Returns the `channels` object
return channels;
};
console.log("Count of conversations for all channels:");
console.log(getConversationsByChannel(transcriptsData));
// Logs { "channel1": 2, "channel2": 3 }
console.log("Count of conversations for 'channel1' only:");
console.log(getConversationsByChannel(transcriptsData, "channel1"));
// Logs { "channel1": 2 }