blocks|key|2291717|text|您可以使用create函数来获取n对象，并使用休息参数将它们收集到数组中。现在，您可以将数组合并到铺展中以组合对象，并在定制器函数中使用Array.map()或lodash的_.map()和_.add()对数组中的项进行求和|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2291718|​|2291719|const+{+mergeWith,+isArray,+map,+add+}+=+_

const+fn+=+(...rest)+=>+_.mergeWith({},+...rest,+(o+=+[],+s)+=>
++map(s,+(n,+i)+=>+add(n,+o[i]))
)

const+a+=+{bar:[1,2],+foo:[7,9]}
const+b+=+{bar:[2,2],+foo:[3,1]}
const+c+=+{bar:[3,2],+foo:[5,6]}
const+d+=+{bar:[4,2],+foo:[5,4]}

const+result+=+fn(a,+b,+c,+d)

console.log(result)|code-block|syntax|javascript|2291720|<script+src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.min.js"></script>|2291721|2291722|还可以使用lodash/fp创建一个函数，将所有值与_.mergeAllWith()合并到多维数组中，然后使用_.zipAll()转换数组，并对每个数组进行求和：|2291723|2291724|const+{+rest,+flow,+mergeAllWith,+isArray,+head,+mapValues,+zipAll,+map,+sum+}+=+_

const+fn+=+rest(flow(
++mergeAllWith((o,+s)+=>+[...isArray(head(o))+?+o+:+[o],+s]),+//+combine+to+a+multidimensional+array
++mapValues(flow(
++++zipAll,
++++map(sum)
++)),
))

const+a+=+{bar:[1,2],+foo:[7,9]}
const+b+=+{bar:[2,2],+foo:[3,1]}
const+c+=+{bar:[3,2],+foo:[5,6]}
const+d+=+{bar:[4,2],+foo:[5,4]}

const+result+=+fn(a,+b,+c,+d)

console.log(result)|2291725|<script+src='https://cdn.jsdelivr.net/g/lodash@4(lodash.min.js%2Blodash.fp.min.js)'></script>|2291726|2291727|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/rest_parameters|1|https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax|2|https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map|3|https://lodash.com/docs/4.17.11#map|4|https://lodash.com/docs/4.17.11#add|5|https://github.com/lodash/lodash/wiki/FP-Guide^0|G|1|1W|B|2F|7|2N|7|N|4|0|1D|2|1|1W|B|2|2F|7|3|2N|7|4|0|0|0|0|0|Q|G|1J|A|5|9|5|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1F|8|@$9|1G|A|1H|B|C]|$9|1I|A|1J|B|C]|$9|1K|A|1L|B|C]|$9|1M|A|1N|B|C]]|D|@$9|1O|A|1P|1|1Q]|$9|1R|A|1S|1|1T]|$9|1U|A|1V|1|1W]|$9|1X|A|1Y|1|1Z]|$9|20|A|21|1|22]]|E|$]]|$1|F|3|G|5|6|7|23|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|24|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|J|7|25|8|@]|D|@]|E|$K|L]]|$1|O|3|G|5|6|7|26|8|@]|D|@]|E|$]]|$1|P|3|Q|5|6|7|27|8|@$9|28|A|29|B|C]|$9|2A|A|2B|B|C]]|D|@$9|2C|A|2D|1|2E]]|E|$]]|$1|R|3|G|5|6|7|2F|8|@]|D|@]|E|$]]|$1|S|3|T|5|J|7|2G|8|@]|D|@]|E|$K|L]]|$1|U|3|V|5|J|7|2H|8|@]|D|@]|E|$K|L]]|$1|W|3|G|5|6|7|2I|8|@]|D|@]|E|$]]|$1|X|3|-4|5|6|7|2J|8|@]|D|@]|E|$]]]|Y|$Z|$5|10|11|12|E|$13|14]]|15|$5|10|11|12|E|$13|16]]|17|$5|10|11|12|E|$13|18]]|19|$5|10|11|12|E|$13|1A]]|1B|$5|10|11|12|E|$13|1C]]|1D|$5|10|11|12|E|$13|1E]]]]

<p>You can use create a function that takes <code>n</code> objects, and collects them to an array using <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/rest_parameters" rel="nofollow noreferrer">rest parameters</a>. Now you can <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax" rel="nofollow noreferrer">spread</a> the array into <a href="https://lodash.com/docs/4.17.11#mergeWith" rel="nofollow noreferrer"><code>_.mergeWith()</code></a> to combine the objects, and in the customizer function sum the items in the arrays using <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map" rel="nofollow noreferrer"><code>Array.map()</code></a> or lodash's <a href="https://lodash.com/docs/4.17.11#map" rel="nofollow noreferrer"><code>_.map()</code></a> and <a href="https://lodash.com/docs/4.17.11#add" rel="nofollow noreferrer"><code>_.add()</code></a>:</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 { mergeWith, isArray, map, add } = _

const fn = (...rest) =&gt; _.mergeWith({}, ...rest, (o = [], s) =&gt;
  map(s, (n, i) =&gt; add(n, o[i]))
)

const a = {bar:[1,2], foo:[7,9]}
const b = {bar:[2,2], foo:[3,1]}
const c = {bar:[3,2], foo:[5,6]}
const d = {bar:[4,2], foo:[5,4]}

const result = fn(a, b, c, d)

console.log(result)</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.min.js"&gt;&lt;/script&gt;</code></pre>
</div>
</div>
</p>

<p>You can also use <a href="https://github.com/lodash/lodash/wiki/FP-Guide" rel="nofollow noreferrer">lodash/fp</a> to create a function that merges all values to a multidimensional array with <code>_.mergeAllWith()</code>, then transpose the arrays using <code>_.zipAll()</code>, and sums each array:</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 { rest, flow, mergeAllWith, isArray, head, mapValues, zipAll, map, sum } = _

const fn = rest(flow(
  mergeAllWith((o, s) =&gt; [...isArray(head(o)) ? o : [o], s]), // combine to a multidimensional array
  mapValues(flow(
    zipAll,
    map(sum)
  )),
))

const a = {bar:[1,2], foo:[7,9]}
const b = {bar:[2,2], foo:[3,1]}
const c = {bar:[3,2], foo:[5,6]}
const d = {bar:[4,2], foo:[5,4]}

const result = fn(a, b, c, d)

console.log(result)</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script src='https://cdn.jsdelivr.net/g/lodash@4(lodash.min.js+lodash.fp.min.js)'&gt;&lt;/script&gt;</code></pre>
</div>
</div>
</p>


blocks|key|102945|text|您可以使用普通JavaScript和Object.entries、concat和reduce来完成这一任务。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|102946|​|102947|const+a+=+{+bar:+[1,2],+foo:+[7,9]+};
const+b+=+{+bar:+[2,2],+foo:+[3,1]+};

const+entries+=+Object.entries(a).concat(Object.entries(b));

const+result+=+entries.reduce((accum,+[key,+val])+=>+{
++accum[key]+=+accum[key]+?+accum[key].map((x,+i)+=>+x+%2B+val[i])+:+val;
++return+accum;
},+{+});

console.log(result);|code-block|syntax|javascript|102948|102949|entityMap^0|I|E|X|6|14|6|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]|$9|S|A|T|B|C]|$9|U|A|V|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|W|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|X|8|@]|D|@]|E|$K|L]]|$1|M|3|G|5|6|7|Y|8|@]|D|@]|E|$]]|$1|N|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|O|$]]

<p>You can accomplish this using plain JavaScript with <code>Object.entries</code>, <code>concat</code> and <code>reduce</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 a = { bar: [1,2], foo: [7,9] };
const b = { bar: [2,2], foo: [3,1] };

const entries = Object.entries(a).concat(Object.entries(b));

const result = entries.reduce((accum, [key, val]) =&gt; {
  accum[key] = accum[key] ? accum[key].map((x, i) =&gt; x + val[i]) : val;
  return accum;
}, { });

console.log(result);</code></pre>
</div>
</div>
</p>


<p>I do have two objects containing keys like</p>

<pre><code>var a = {bar:[1,2], foo:[7,9]}
var b = {bar:[2,2], foo:[3,1]}
</code></pre>

<p>I want to get the fallowing results:</p>

<pre><code>var c = {bar:[3,4], foo:[10,10]}
</code></pre>

<p>I already have a <code>for</code> logic like:</p>

<pre><code>for (let key in b) {
  if (a[key]) {
      a[key][0] += b[key][0];
      a[key][1] += b[key][1];
  } 
  else a[key] = b[key];
}
</code></pre>

<p>But I would like to make this logic in a lodash way. How can I Do it?</p>


custom sum elements by key using lodash

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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我确实有两个对象包含密钥，比如var a = {bar:[1,2], foo:[7,9]}var b = {bar:[2,2], foo:[3,1]}我想知道休闲结果：var c = {bar:[3,4], foo:[10,10]}我已经有了一个for逻辑，例如：for (let key in b) {  if (a[...

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