blocks|key|1539919|text|使用从student对象获取的值创建键。使用student将当前的key分配给obj+(累加器)|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1539920|​|1539921|const+students+=+[{
++++name:+"sam",
++++age:+26,
++},
++{
++++name:+"john",
++++age:+30,
++}
];

const+result+=+students.reduce((obj,+student)+=>+{
++const+key+=+`${student.name}_${student.age}`;
++obj[key]+=+student;
++return+obj;
},+{});

console.log(result);|code-block|syntax|javascript|1539922|1539923|使用回调创建键的通用方法：|1539924|1539925|const+keyBy+=+(arr,+cb)+=>+
++arr.reduce((r,+o)+=>+{
++++const+key+=+cb(o);
++++r[key]+=+o;
++++return+r;
++},+{});
++
const+students+=+[{"name":"sam","age":26},{"name":"john","age":30}];++

const+result+=+keyBy(students,+(o)+=>+`${o.name}_${o.age}`);

console.log(result);|1539926|1539927|entityMap^0|3|7|M|7|X|3|13|3|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@$9|W|A|X|B|C]|$9|Y|A|Z|B|C]|$9|10|A|11|B|C]|$9|12|A|13|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|14|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|15|8|@]|D|@]|E|$K|L]]|$1|M|3|G|5|6|7|16|8|@]|D|@]|E|$]]|$1|N|3|O|5|6|7|17|8|@]|D|@]|E|$]]|$1|P|3|G|5|6|7|18|8|@]|D|@]|E|$]]|$1|Q|3|R|5|J|7|19|8|@]|D|@]|E|$K|L]]|$1|S|3|G|5|6|7|1A|8|@]|D|@]|E|$]]|$1|T|3|-4|5|6|7|1B|8|@]|D|@]|E|$]]]|U|$]]

<p>Create the key with the values taken from the <code>student</code> object. Assign the current <code>student</code> to the <code>obj</code> (the accumulator) using the <code>key</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>const students = [{
    name: "sam",
    age: 26,
  },
  {
    name: "john",
    age: 30,
  }
];

const result = students.reduce((obj, student) =&gt; {
  const key = `${student.name}_${student.age}`;
  obj[key] = student;
  return obj;
}, {});

console.log(result);</code></pre>
</div>
</div>
</p>

<p>A generic approach that uses a callback to create the key:</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 keyBy = (arr, cb) =&gt; 
  arr.reduce((r, o) =&gt; {
    const key = cb(o);
    r[key] = o;
    return r;
  }, {});
  
const students = [{"name":"sam","age":26},{"name":"john","age":30}];  

const result = keyBy(students, (o) =&gt; `${o.name}_${o.age}`);

console.log(result);</code></pre>
</div>
</div>
</p>


blocks|key|1539940|text|您不能用这样的模板文字将其分配到左侧。尝试先定义属性，然后将其分配给对象：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1539941|​|1539942|const+students+=+[+{+name:+"sam",+age:+26,+},+{+name:+'john',+age:+30,+}+];
const+finalObj+=+students.reduce((obj,+student)+=>+{
++const+prop+=+`${student.name}_${student.age}`;
++obj[prop]+=+student;
++return+obj;
},+{});
console.log(finalObj);|code-block|syntax|javascript|1539943|1539944|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|N|8|@]|9|@]|A|$G|H]]|$1|I|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|P|8|@]|9|@]|A|$]]]|K|$]]

<p>You can't assign to the left side with a template literal like that. Try defining the property first, and then assigning it to the object:</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 students = [ { name: "sam", age: 26, }, { name: 'john', age: 30, } ];
const finalObj = students.reduce((obj, student) =&gt; {
  const prop = `${student.name}_${student.age}`;
  obj[prop] = student;
  return obj;
}, {});
console.log(finalObj);</code></pre>
</div>
</div>
</p>


blocks|key|1302475|text|我试过这个剧本，它成功了。只需根据学生姓名和年龄创建变量名，然后将其重新分配给对象。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1302476|students.reduce((obj,+student)+=>+{
++++var+name+=+student.name+%2B+'-'+%2B+student.age;
++++obj[name]+=+student;
++++return+obj;
++},+{});|code-block|syntax|javascript|1302477|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>I tried this script and it worked. Simply create variable name based on student name and age then assign back to the object</p>

<pre><code>students.reduce((obj, student) =&gt; {
    var name = student.name + '-' + student.age;
    obj[name] = student;
    return obj;
  }, {});
</code></pre>


blocks|key|238431|text|希望这个片段会有用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|238432|​|238433|const+students+=+[{
++++name:+"sam",
++++age:+26,
++},
++{
++++name:+"john",
++++age:+30,
++}
]
//Using+reduce+function+to+add+value+to+the+accumalator
var+x+=+students.reduce(function(acc,+curr,+index)+{
++//+Here+acc+is+the+object+which+is+passed+as+argument,
++//In+this+object+checking+if+it+has+a+key+like+sam_26+&+so+on
++if+(!acc.hasOwnProperty([curr['name']+%2B+'_'+%2B+curr['age']]))+{
++++//if+not+then+add+the+key+and+add+relevant+vakues+to+it
++++acc[curr.name+%2B+'_'+%2B+curr.age]+=+{
++++++name:+curr.name,
++++++age:+curr.age
++++}
++}
++return+acc;
},+{});
console.log(x)|code-block|syntax|javascript|238434|238435|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|N|8|@]|9|@]|A|$G|H]]|$1|I|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|P|8|@]|9|@]|A|$]]]|K|$]]

<p>Hopefully this snippet will be useful</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 students = [{
    name: "sam",
    age: 26,
  },
  {
    name: "john",
    age: 30,
  }
]
//Using reduce function to add value to the accumalator
var x = students.reduce(function(acc, curr, index) {
  // Here acc is the object which is passed as argument,
  //In this object checking if it has a key like sam_26 &amp; so on
  if (!acc.hasOwnProperty([curr['name'] + '_' + curr['age']])) {
    //if not then add the key and add relevant vakues to it
    acc[curr.name + '_' + curr.age] = {
      name: curr.name,
      age: curr.age
    }
  }
  return acc;
}, {});
console.log(x)</code></pre>
</div>
</div>
</p>


<p>hi I am trying to create a object map from array of objects using reduce method but did n't find a way to add 2 properties as key . Let  say I have array of objects like - </p>

<pre><code> const students = [
    {
      name: "sam",
      age: 26,
    },
    {
      name: 'john",
      age: 30,
    }
    ]
</code></pre>

<p>i am trying to create a map like </p>

<pre><code>{
  sam_26:{
      name: "sam",
      age: 26,
    }
 }
</code></pre>

<p>my code for reduce function :</p>

<pre><code>students.reduce((obj, student) =&gt; {
    `${obj[student.name]}_${obj[student.age]}` = student;
    return obj;
  }, {});
</code></pre>

<p>this didn't work . any pointers will be helpful ..thanks!</p>


js object property creation from keys

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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嗨，我正在尝试使用减少方法从对象数组中创建一个对象映射，但是没有找到添加2个属性作为键的方法。假设我有一系列的物体，比如- const students = [    {      name: "sam",      age: 26,    },    {      name: 'john",      age: 30...

问从键创建js对象属性
EN

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