如何检查对象中的数组是否全部为空? [英] How to Check if Arrays in a Object Are All Empty?
问题描述
所以我需要传递一个对象,其中每个属性都是数组。该函数将使用保存在每个数组中的信息,但是我想通过检查每个数组的每个数组是否为空/空来检查整个对象是否为空(不只是没有属性)。到目前为止,我所拥有的:
So I need to pass in a object where each of its properties are arrays. The function will use the information held in each array, but I want to check if the whole object is empty empty (not just having no properties) by checking if each of its arrays are empty/null as well. What I have so far:
function isUnPopulatedObject(obj) { // checks if any of the object's values are falsy
if (!obj) {
return true;
}
for (var i = 0; i < obj.length; i++) {
console.log(obj[i]);
if (obj[i].length != 0) {
return false;
}
}
return true;
}
因此,例如,这将导致上面的 false
:
So for example, this would result in the above being false
:
obj {
0: Array[0]
1: Array[1]
2: Array[0]
}
虽然这是我要检查的空白(确实如此):
While this is the empty I'm checking for (so is true):
obj {
0: Array[0]
1: Array[0]
2: Array[0]
}
上面的代码不起作用。
The above code doesn't work. Thanks in advance.
推荐答案
因此,如果我们要遍历该对象并确定该对象的每个键是否都通过了检查,我们可以使用 Object.keys
和Array#extra every 这样,
So if we want to go through the object and find if every key of that object passes a check, we can use Object.keys
and the Array#extra every
like so:
var allEmpty = Object.keys(obj).every(function(key){
return obj[key].length === 0
})
这会将 allEmpty
设置为一个布尔值(真/假),具体取决于我们是否每次运行给定的检查 obj [key] .length === 0
是否返回真。
This will set allEmpty
to a boolean value (true/false), depending on if every time we run the given check obj[key].length === 0
returns true or not.
此对象将 allEmpty
设置为true:
This object sets allEmpty
to true:
var obj = {
0: [],
1: [],
2: []
}
,而将其设置为false:
while this sets it to false:
var obj = {
0: [],
1: [],
2: [],
3: [1]
}
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