如何打印 javascript 中所有百分比超过 70% 的学生姓名?

how to print all students name which have percentage more than 70% in javascript?

我正在使用 json-rule-enginehttps://www.npmjs.com/package/json-rules-engine 我有一个学生名单,上面有姓名和他们的百分比,我还有 business rule 百分比应该大于或等于 70所以我想打印所有百分比超过 70 的学生姓名

这是我的代码 https://repl.it/repls/AlienatedLostEntropy#index.js

学生名单

const students = [
  {
    name:"naveen",
    percentage:70
  },
  {
    name:"rajat",
    percentage:50
  },
  {
    name:"ravi",
    percentage:75
  },
  {
    name:"kaushal",
    percentage:64
  },
  {
    name:"piush",
    percentage:89
  }
] 

规则

engine.addRule({
  conditions: {
    all: [
      {
        fact: "percentage",
        operator: "greaterThanInclusive",
        value: 70
      }
    ]
  },
  onSuccess(){
    console.log('on success called')
  },
  onFailure(){
    console.log('on failure called')
  },
  event: {
    type: "message",
    params: {
      data: "hello-world!"
    }
  }
});

代码 https://repl.it/repls/AlienatedLostEntropy#index.js 任何更新

json-rules-engine 模块采用不同格式的数据。在你的 Repl.it 中你没有定义任何事实。

事实应该是:

let facts = [
  {
    name:"naveen",
    percentage:70
  },
  [...]

此外,模块本身似乎不处理事实数组。您必须对其进行调整才能实现这一目标。这可以通过以下方式完成:

facts.forEach((fact) => {
  engine
    .run(fact)
    [...]

终于在almanac里面找到了学生数据。您可以通过以下方式获取这些值:results.almanac.factMap.get('[name|percentage|age|school|etc]').value

这是更新后的 Repl.it:https://repl.it/@adelriosantiago/json-rules-example

我可能提交了一个完全不相关的答案,但这里是。由于 students 对象是一个数组,您可以循环遍历它,然后使用 if else 语句。

for (let i = 0; i < students.length; i++) {
    if (students[i].percentage >= 70) {
        console.log(students[i].name);
    }
}

抱歉,如果这不正确!

这是一个工作示例。

计数 successfailed 个案例

const { Engine } = require("json-rules-engine");


let engine = new Engine();

const students = [
  {
    name:"naveen",
    percentage:70
  },
  {
    name:"rajat",
    percentage:50
  },
  {
    name:"ravi",
    percentage:75
  },
  {
    name:"kaushal",
    percentage:64
  },
  {
    name:"piush",
    percentage:89
  }
] 

engine.addRule({
    conditions: {
            all: [{
            fact: 'percentage',
            operator: 'greaterThanInclusive',
            value: 70
        }]
    },
    event: { type: 'procedure_result'}
})

let result = {success_count : 0 , failed_count : 0}

engine.on('success', () => result.success_count++)
    .on('failure', () => result.failed_count++)

const getResults = function(){
    return new Promise((resolve, reject) => {
        students.forEach(fact => {
            return engine.run(fact)
            .then(() => resolve())
        })
    })
}

getResults().then(() => console.log(result));