将函数应用于 JavaScript 数组中的每个对象
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Applying a function to each object in a JavaScript array
提问by Zalaboza
[ {name:'hi',data:'1,2,3,4,5'} , {name:'hello',data:'5,4,3,2,1'} ]
What I need is to apply a split on dataof each object in array so that the result would be:
我需要的是对data数组中的每个对象应用拆分，以便结果是：
[ {name:'hi',data:[1,2,3,4,5]} , {name:'hello',data:[5,4,3,2,1]} ]
I know I can loop through the array using for eachand produce a new array, but is there a better, faster method?
我知道我可以使用循环遍历数组for each并生成一个新数组，但是有没有更好、更快的方法？
var arr = [{
name: 'hi',
data: '1,2,3,4,5'
}, {
name: 'hello',
data: '5,4,3,2,1'
}];
var new_arr = [];
for (i in arr) {
var temp = {};
temp.name = arr[i].name;
temp.data = arr[i].data.split(',');
new_arr.push(temp);
}
回答by xdazz
You could use Array.prototype.map:
你可以使用Array.prototype.map：
var new_array = old_array.map(function(e) {
e.data = e.data.split(',');
return e;
});
As the comment said, this way change the old_array, you could return an new object in the callback function with no changing to the original array.
正如评论所说，通过这种方式更改old_array，您可以在回调函数中返回一个新对象，而无需更改原始数组。
回答by thefourtheye
var data = [{
name: 'hi',
data: '1,2,3,4,5'
}, {
name: 'hello',
data: '5,4,3,2,1'
}];
You can use the Array.prototype.mapon datato construct a new Array, like this
你可以使用Array.prototype.mapondata来构造一个新的数组，像这样
var result = data.map(function (currentObject) {
return {
name: currentObject.name,
data: currentObject.data.split(",").map(Number)
};
});
Here, we splitthe currentObject.databased on ,and then we call Numberfunction on all the split strings, so that you will get the result object's dataas numbers, as you wanted in the question.
在这里，我们split的currentObject.data基础上,，然后我们呼吁Number所有分割字符串的函数，这样你会得到的结果对象的data数字，因为你在这个问题想。
Output
输出
[{
name: 'hi',
data: [1, 2, 3, 4, 5]
}, {
name: 'hello',
data: [5, 4, 3, 2, 1]
}]
