javascript 下划线如何使用省略
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underscore how to use omit
提问by bsr
How does underscore's omit work. I was expecting to remove properties with key 1 and 2 below. but it is not.
下划线的省略如何工作。我期待删除下面的键 1 和 2 的属性。但事实并非如此。
var test = {
1: [],
2: [],
3: [],
4: []
}
var out = _.omit(test, [1,2])
var out2 = _.omit(test, 1,2)
console.log(out)
console.log(out2)
Object {1: Array[0], 2: Array[0], 3: Array[0], 4: Array[0]}
Object {1: Array[0], 2: Array[0], 3: Array[0], 4: Array[0]}
回答by Quentin
_omitcalls _containswhich includes this line of code:
_omit_contains包括这行代码的调用：
return value === target;
The keys will be strings, so you need to pass strings in to compare to (since "1" === 1is false).
键将是字符串，因此您需要将字符串传入以进行比较（因为"1" === 1为 false）。
_.omit(test, "1", "2")
回答by bsr
I guess key needs to be string. This worked. http://jsfiddle.net/FMaDq/2/
我猜键需要是字符串。这奏效了。 http://jsfiddle.net/FMaDq/2/
var out = _.omit(test, ['1','2'])
