如何将一串数字转换为一组数字? [英] How to convert a string of numbers to an array of numbers?

问题描述

我有以下字符串 -

var a = "1,2,3,4";

当我这样做 -

var b = a.split(',');

我得到 b 作为 ["1", "2", "3", "4"]

我可以做些什么让 b 变成 [1, 2, 3, 4] 吗?

can I do something to get b as [1, 2, 3, 4] ?

推荐答案

我给高尔夫球手的 2 美分:

My 2 cents for golfers:

b="1,2,3,4".split`,`.map(x=>+x)

backquote 是字符串字面量所以我们可以省略括号(因为 split 函数的性质)但它等价于 split(',').字符串现在是一个数组，我们只需要使用返回字符串整数的函数来映射每个值，所以 x=>+x(甚至比 Number 函数(5 个字符而不是 6 个字符)等价于:

backquote is string litteral so we can omit the parenthesis (because of the nature of split function) but it is equivalent to split(','). The string is now an array, we just have to map each value with a function returning the integer of the string so x=>+x (which is even shorter than the Number function (5 chars instead of 6)) is equivalent to :

function(x){return parseInt(x,10)}// version from techfoobar
(x)=>{return parseInt(x)}         // lambda are shorter and parseInt default is 10
(x)=>{return +x}                  // diff. with parseInt in SO but + is better in this case
x=>+x                             // no multiple args, just 1 function call

我希望它更清楚一点.

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