使用Underscore.js从Object中删除空属性/ falsy值

问题描述

我有一个具有多个属性的对象。我想删除任何有假值的属性。

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

这可以通过，但对象呢？

This can be achieved with compact on arrays, but what about objects?

推荐答案

你可以制作自己的下划线插件（mixin）：

You could make your own underscore plugin (mixin) :

_.mixin({
  compactObject: function(o) {
    _.each(o, function(v, k) {
      if(!v) {
        delete o[k];
      }
    });
    return o;
  }
});

然后将其用作本机下划线方法：

And then use it as a native underscore method :

var o = _.compactObject({
  foo: 'bar',
  a: 0,
  b: false,
  c: '',
  d: null,
  e: undefined
});

更新

因为 ，这个mixin影响原始对象，而原始 compact 下划线方法。

解决此问题并使我们的 compactObject 表现得更像是 cousin ，这是一个小小的更新：

Update

As @AndreiNeculau pointed out, this mixin affects the original object, while the original compact underscore method returns a copy of the array.
To solve this issue and make our compactObject behave more like it's cousin, here's a minor update:

_.mixin({
  compactObject : function(o) {
     var clone = _.clone(o);
     _.each(clone, function(v, k) {
       if(!v) {
         delete clone[k];
       }
     });
     return clone;
  }
});

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