Javascript 映射数组数组
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Map an array of arrays
提问by bwbrowning
Is there a method in lodash to map over an array of arrays
lodash 中是否有一种方法可以映射数组数组
I would like to do something like this so that it keeps the structure of the array.
我想做这样的事情，以保持数组的结构。
def double(x) { return x*2 }
_([[1,2],[3,4]]).somemethod(double) == [[2,4],[6,8]]
采纳答案by TbWill4321
You can make your code much cleaner with ES2015 arrow functions:
你可以使用 ES2015 箭头函数让你的代码更简洁：
var array = [[1, 2], [3, 4]];
var double = x => x * 2;
var doubledArray = _.map( array, subarray => _.map( subarray, double ));
Using vanilla JS:
使用香草JS：
var array = [[1, 2], [3, 4]];
var double = x => x * 2;
var doubledArray = array.map( subarray => subarray.map( double ));
回答by Rados?aw Miernik
Just _.mapit twice:
只是_.map两次：
var array = [[1, 2], [3, 4]];
var doubledArray = _.map(array, function (nested) {
return _.map(nested, function (element) {
return element * 2;
});
});
Or without lodash:
或者没有lodash：
var doubledArray = array.map(function (nested) {
return nested.map(function (element) {
return element * 2;
});
});
Furthermore, consider using es6 arrow functions:
此外，考虑使用es6 箭头函数：
var doubledArray = array.map(nested => nested.map(element => element * 2));
回答by manguel1980
It can be a kind of entangle:
它可以是一种纠缠：
var Coef = Array.apply(null, Array(3)).map(function(){return
Array.apply(null, Array(4)).map(function(){return 0})})
Nevertheless, it can be useful if you want to initialize an array in Gas
然而，如果你想在Gas 中初始化一个数组，它会很有用
回答by user12160378
const deepMap=(input,callback)=>input.map(entry=>entry.map?deepMap(entry,callback):callback(entry))
//test
deepMap([1,2,3,[1,2]],x=>x*2) // [1,4,9,[1,4]]
回答by Pedro Braz
The simple way to do that at ES5:
在 ES5 中做到这一点的简单方法：
[].concat(...this.array1.map(ap => ap.subArray))
[].concat(...this.array1.map(ap => ap.subArray))
