blocks|key|410249|text|有了罗达什的transform|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|410250|_.transform(obj,+function(res,+v,+k)+{
++if+(v)+res[k]+=+v;
});|code-block|syntax|javascript|410251|entityMap|0|LINK|mutability|MUTABLE|url|http://lodash.com/docs#transform^0|6|9|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

With lodash's <a href="http://lodash.com/docs#transform" rel="noreferrer">transform</a>,

<pre><code>_.transform(obj, function(res, v, k) {
 if (v) res[k] = v;
});
</code></pre>

blocks|key|192064|text|Object.keys(o).forEach(function(k)+{
++++if+(!o[k])+{
++++++++delete+o[k];
++++}
});|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|192065|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>Object.keys(o).forEach(function(k) {
 if (!o[k]) {
 delete o[k];
 }
});
</code></pre>

blocks|key|192091|text|您可以创建浅层克隆：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|192092|_(obj).reduce(function(a,v,k){+
+++++if(v){+a[k]=v;+}+
+++++return+a;+
},{});|code-block|syntax|javascript|192093|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|$]]

You can create a shallow clone:

<pre><code>_(obj).reduce(function(a,v,k){ 
 if(v){ a[k]=v; } 
 return a; 
},{});
</code></pre>

blocks|key|192060|text|对于对象，使用delete。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|192061|for(var+k+in+obj){

++if(obj.hasOwnProperty(k)+&&+!obj[k]){
++++delete+obj[k];
++}
}|code-block|syntax|javascript|192062|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|$]]

for object use delete.

<pre><code>for(var k in obj){

 if(obj.hasOwnProperty(k) &amp;&amp; !obj[k]){
 delete obj[k];
 }
}
</code></pre>

blocks|key|410365|text|突然，我需要创建一个函数来递归地删除错误。我希望这能帮到你。我在用Lodash。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|410366|var+removeFalsies+=+function+(obj)+{
++++return+_.transform(obj,+function+(o,+v,+k)+{
++++++++if+(v+&&+typeof+v+===+'object')+{
++++++++++++o[k]+=+_.removeFalsies(v);
++++++++}+else+if+(v)+{
++++++++++++o[k]+=+v;
++++++++}
++++});
};

_.mixin({+'removeFalsies':+removeFalsies+});|code-block|syntax|javascript|410367|然后你就可以使用它了：|410368|var+o+=+_.removeFalsies({
++foo:+'bar',
++a:+0,
++b:+false,
++c:+'',
++d:+null,
++e:+undefined,
++obj:+{
++++foo:+'bar',
++++a:+0,
++++b:+false,
++++c:+'',
++++d:+null,
++++e:+undefined
++}
});

//+{
//+++foo:+'bar',
//+++obj:+{
//+++++foo:+'bar'
//+++}
//+}|410369|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Suddenly I needed create a function to remove recursively falsies. I hope this helps. I'm using Lodash.

<pre><code>var removeFalsies = function (obj) {
 return _.transform(obj, function (o, v, k) {
 if (v &amp;&amp; typeof v === 'object') {
 o[k] = _.removeFalsies(v);
 } else if (v) {
 o[k] = v;
 }
 });
};

_.mixin({ 'removeFalsies': removeFalsies });
</code></pre>

Then you can use it:

<pre><code>var o = _.removeFalsies({
 foo: 'bar',
 a: 0,
 b: false,
 c: '',
 d: null,
 e: undefined,
 obj: {
 foo: 'bar',
 a: 0,
 b: false,
 c: '',
 d: null,
 e: undefined
 }
});

// {
// foo: 'bar',
// obj: {
// foo: 'bar'
// }
// }
</code></pre>

blocks|key|410294|text|添加到gion_13的答案中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|410295|_.mixin({
++compactObject+:+function(o)+{
+++++var+newObject+=+{};
+++++_.each(o,+function(v,+k)+{
+++++++if(v+!==+null+&&+v+!==+undefined)+{
+++++++++newObject[k]+=+v
+++++++}
+++++});
+++++return+newObject;
++}
});|code-block|syntax|javascript|410296|它创建了一个新对象并添加了键和值，而不是克隆所有内容并删除键值对。细微的差别。|410297|但更重要的是，显式地检查null和undefined，而不是falsey，这将删除值为false的键值对。|410298|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

To add to gion_13's answer:

<pre><code>_.mixin({
 compactObject : function(o) {
 var newObject = {};
 _.each(o, function(v, k) {
 if(v !== null &amp;&amp; v !== undefined) {
 newObject[k] = v
 }
 });
 return newObject;
 }
});
</code></pre>

This one creates a new object and adds keys and values instead of cloning everything and deleting key-value pairs. Minor difference.

But more importantly, checks explicitly for null and undefined instead of falsey, which will delete key-value pairs that have false as a value.

blocks|key|410497|text|您应该在lodash中使用pickBy。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|410498|pickBy的默认签名为_.(sourceObj,+[_.identity])，因此它将移除空属性|410499|_.pickBy(sourceObj);|code-block|syntax|javascript|410500|entityMap^0|D|6|0|C|R|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@$9|S|A|T|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|U|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

You should use <code>pickBy</code> from lodash.
The default signature of pickBy is <code>_.(sourceObj, [_.identity])</code> so it will remove empty properties
<pre class="lang-js prettyprint-override"><code>_.pickBy(sourceObj);
</code></pre>

blocks|key|192284|text|在lodash中，您可以这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|192285|_.pickBy(object, _.identity);|code-block|syntax|javascript|192286|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|$]]

in the lodash you do like this:

<pre><code>_.pickBy(object, _.identity);
</code></pre>

blocks|key|192245|text|尽管文档中记录了在数组中使用_.compact。它似乎也适用于对象。我刚刚在chrome、opera和firefox控制台上运行了以下代码：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|192246|var+obj+=+{first:+1,+second:+null,+third:+3,+fourth:+function(){return+5}}
undefined
_.compact(obj)

[1,+3,+function()]|code-block|syntax|javascript|192247|更新:正如示例所示，在对象上调用_.compact将丢弃键并返回一个压缩数组。|192248|entityMap^0|E|9|0|0|G|9|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

Although <code>_.compact</code> is documented for use in arrays. It seems to work for objects too. I just ran the following in chrome, opera and firefox consoles:

<pre><code>var obj = {first: 1, second: null, third: 3, fourth: function(){return 5}}
undefined
_.compact(obj)

[1, 3, function()]
</code></pre>

UPDATE: As the sample indicates calling <code>_.compact</code> on an object will drop the keys and return a compacted array.

I have an object with several properties. I would like to remove any properties that have falsy values.

This can be achieved with <a href="http://underscorejs.org/#compact" rel="noreferrer"><code>compact</code></a> on arrays, but what about objects?

Remove empty properties / falsy values from Object with Underscore.js

我有一个具有几个属性的对象。我想删除所有具有错误值的属性。这可以通过数组上的来实现，但是对象呢？

问使用Underscore.js从对象中删除空属性/假值
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回答 9

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