Convert string array to integer array

问题:

I have an array of strings like ['2', '10', '11'] and was wondering what's the most efficient way of converting it to an integer array. Should I just loop through all the elements and convert it to an integer or is there a function that does this?

回答1:

Use map() and parseInt()

var res = ['2', '10', '11'].map(function(v) {
  return parseInt(v, 10);
});

document.write('<pre>' + JSON.stringify(res, null, 3) + '<pre>')

More simplified ES6 arrow function

var res = ['2', '10', '11'].map(v => parseInt(v, 10));

document.write('<pre>' + JSON.stringify(res, null, 3) + '<pre>')

Or using Number

var res = ['2', '10', '11'].map(Number);

document.write('<pre>' + JSON.stringify(res, null, 3) + '<pre>')

---

Or adding + symbol will be much simpler idea which parse the string

var res = ['2', '10', '11'].map(v => +v );

document.write('<pre>' + JSON.stringify(res, null, 3) + '<pre>')

---

FYI : As @Reddy comment - map() will not work in older browsers either you need to implement it ( Fixing JavaScript Array functions in Internet Explorer (indexOf, forEach, etc.) ) or simply use for loop and update the array.

Also there is some other method which is present in it's documentation please look at Polyfill , thanks to @RayonDabre for pointing out.

回答2:

The simplest way to parse int from string is adding a + sign before:

var res = ['1', '2', '3'].map(function(v){return +v})

回答3:

You can use

var yourArray= yourArray.map(Number);

Using jQuery, you can use the map method as below

$.map(yourArray, function(value,index) { 
     return parseInt(value); 
 });