将小写字符串与未更改的对象键匹配

Question

我想在不改变原始键的情况下将小写字符串与对象键匹配。稍后我将使用原始形状的钥匙。有办法吗？

userInput = "SOmekey".toLowerCase();
data = {"SoMeKeY": "Value"};
if (data[userInput]) {
    for (const [key, value] of Object.entries(data)) {
        console.log('Unaltered data: ', key, value)
    }
}

Answer 1

字符串是不可变的，因此如果您对一个字符串调用 .toLowerCase()，您并不是在更改该字符串，而是在创建一个新字符串。所以不用担心回到原来的那个。

userInput = "SOmekey";
data = {"SoMeKeY": "Value"};

for (key in data){
  // Neither key or userInput are changed by creating
  // lower cased versions of them. New strings are created
  // and those new strings are used here for comparison.
  if(key.toLowerCase() === userInput.toLowerCase()){
    console.log(key, data[key], "| Original user input: ", userInput);
  }
}

Answer 2

然后只需降低对象键的大小写即可搜索:D

userInput = "SOmekey".toLowerCase();
data = {"SoMeKeY": "Value"};

//object's keys except they are lowered as well
let loweredKeys=Object.keys(data).map(a=>a.toLowerCase())

//now for verification
if(loweredKeys.includes(userInput)){
  let keyIndex=loweredKeys.indexOf(userInput)
  let values=Object.values(data)
  let keys=Object.keys(data)
  console.log("Unaltered data: ",keys[keyIndex],values[keyIndex])
}

将小写字符串与未更改的对象键匹配

Matching lowercase string to unaltered object key

javascript

object

matching

lowercase