blocks|key|4155385|text|您可以使用reduce来实现这一点：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4155386|​|4155387|const+data+=+{
++orderId:+999,+menuId:+123456,+questions:+[
++++{
++++++questionId:+123,
++++++depth:+1,
++++++answers:+[
++++++++{+answerId:+999,+text:+"foo1"},
++++++++{+answerId:+888,+text:+"foo2"}
++++++]
++++},
++++{
++++++questionId:+654,
++++++depth:+1,
++++++answers:+[+{+answerId:+777,+text:+"bar"+}]
++++}
++]
}

const+result+=+data.questions.reduce((acc,+{questionId,+answers})+=>+{
++return+Object.assign({
++++[`q_${questionId}`]:+answers.map(
++++++({answerId})+=>+answerId
++++)
++},+acc)
},+{});

console.log(result)|code-block|syntax|javascript|4155388|4155389|entityMap^0|5|6|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|S|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|T|8|@]|D|@]|E|$K|L]]|$1|M|3|G|5|6|7|U|8|@]|D|@]|E|$]]|$1|N|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|O|$]]

<p>you can use <code>reduce</code> to achieve this : </p>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>const data = {
  orderId: 999, menuId: 123456, questions: [
    {
      questionId: 123,
      depth: 1,
      answers: [
        { answerId: 999, text: "foo1"},
        { answerId: 888, text: "foo2"}
      ]
    },
    {
      questionId: 654,
      depth: 1,
      answers: [ { answerId: 777, text: "bar" }]
    }
  ]
}

const result = data.questions.reduce((acc, {questionId, answers}) =&gt; {
  return Object.assign({
    [`q_${questionId}`]: answers.map(
      ({answerId}) =&gt; answerId
    )
  }, acc)
}, {});

console.log(result)</code></pre>
</div>
</div>
</p>


blocks|key|4155448|text|使用reduce的以下方法将完成此工作：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4155449|​|4155450|const+data+=+{
++orderId:+999,
++menuId:+123456,
++questions:+[{
++++++questionId:+123,
++++++depth:+1,
++++++answers:+[{
++++++++++answerId:+999,+
++++++++++text:+"foo1"
++++++++},+{
++++++++++answerId:+888,
++++++++++text:+"foo2"
++++++++}
++++++]
++++},+{
++++++questionId:+654,
++++++depth:+1,
++++++answers:+[{
++++++++answerId:+777,
++++++++text:+"bar"
++++++}]
++++}
++]};

const+result+=+data.questions.reduce((all,+{
++questionId:+id,
++answers
})+=>+{

++all[`q_${id}`]+=+answers.map(a+=>+a.answerId);

++return+all;
},+{});
console.log(result);|code-block|syntax|javascript|4155451|4155452|entityMap^0|2|6|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|S|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|T|8|@]|D|@]|E|$K|L]]|$1|M|3|G|5|6|7|U|8|@]|D|@]|E|$]]|$1|N|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|O|$]]

<p>The following approach with <code>reduce</code> will do the job:</p>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>const data = {
  orderId: 999,
  menuId: 123456,
  questions: [{
      questionId: 123,
      depth: 1,
      answers: [{
          answerId: 999, 
          text: "foo1"
        }, {
          answerId: 888,
          text: "foo2"
        }
      ]
    }, {
      questionId: 654,
      depth: 1,
      answers: [{
        answerId: 777,
        text: "bar"
      }]
    }
  ]};

const result = data.questions.reduce((all, {
  questionId: id,
  answers
}) =&gt; {

  all[`q_${id}`] = answers.map(a =&gt; a.answerId);

  return all;
}, {});
console.log(result);</code></pre>
</div>
</div>
</p>


blocks|key|4155766|text|这是简单的JSON+parsing。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4155767|​|4155768|var+input+=+{
+orderId:999,
+menuId:+123456,
++questions:[{
++++questionId:+123,
++++depth:+1,
++++++++answers:+[
++++++++++++{+answerId:+999,+text:+"foo1"+},
++++++++++++{+answerId:+888,+text:+"foo2"+}]
++},
++{
++++questionId:+654,
++++depth:+1,
++++answers:+[{+answerId:+777,+text:+"bar"+}]
++}]
};

var+length+=+input.questions.length;
var+questionsobj+=+input.questions;
var+resultJsonData+=+{};

for(var+i=0;+i<length;+i%2B%2B)+{+++
+++var+question_id+=+questionsobj[i].questionId;
+++var+answersobj+=+questionsobj[i].answers;
+++var+len+=+answersobj.length;
+++var+arrayObject+=+[];
+++
+++for(var+k=0;+k<len;+k%2B%2B)+{
++++++arrayObject[k]+=+answersobj[k].answerId;
+++}
+++resultJsonData["q_"+%2B+question_id]+=+arrayObject;
}

console.log(JSON.stringify(resultJsonData));|code-block|syntax|javascript|4155769|4155770|entityMap^0|5|C|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|S|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|T|8|@]|D|@]|E|$K|L]]|$1|M|3|G|5|6|7|U|8|@]|D|@]|E|$]]|$1|N|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|O|$]]

<p>This is with simple <code>JSON parsing</code>.</p>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>var input = {
 orderId:999,
 menuId: 123456,
  questions:[{
    questionId: 123,
    depth: 1,
        answers: [
            { answerId: 999, text: "foo1" },
            { answerId: 888, text: "foo2" }]
  },
  {
    questionId: 654,
    depth: 1,
    answers: [{ answerId: 777, text: "bar" }]
  }]
};

var length = input.questions.length;
var questionsobj = input.questions;
var resultJsonData = {};

for(var i=0; i&lt;length; i++) {   
   var question_id = questionsobj[i].questionId;
   var answersobj = questionsobj[i].answers;
   var len = answersobj.length;
   var arrayObject = [];
   
   for(var k=0; k&lt;len; k++) {
      arrayObject[k] = answersobj[k].answerId;
   }
   resultJsonData["q_" + question_id] = arrayObject;
}

console.log(JSON.stringify(resultJsonData));</code></pre>
</div>
</div>
</p>


<p>I'm getting a payload back that I need to pull id's from two separate levels within the payload and return it as a single object of key value pairs. I was attempting to do some sort of combination or <code>ForEach()</code> and <code>reduce()</code> but I couldn't seem to find the right way of doing it. Here is a what the data looks like.</p>

<pre><code>{
 orderId:999,
 menuId: 123456,
  questions:[{
    questionId: 123,
    depth: 1,
        answers: [
            { answerId: 999, text: "foo1" },
            { answerId: 888, text: "foo2" }]
  },
  {
    questionId: 654,
    depth: 1,
    answers: [{ answerId: 777, text: "bar" }]
  }]
}
</code></pre>

<p>What I'm attempting to have as the result</p>

<pre><code>{"q_123": ["999", "888"], "q_654": "777"}
</code></pre>


javascript extract id's from two levels of arrays for key value pairs in new object

我得到了一个有效负载，我需要从有效负载中的两个单独的级别拉取id，并将其作为键值对的单个对象返回。我试图做一些组合，或者ForEach()和reduce()，但是我似乎找不到正确的方法。下面是数据的样子。{ orderId:999, menuId: 123456,  questions:[{    questionId...

问javascript从新对象中的键值对的两级数组中提取id
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