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?
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4 Answers
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.
3 Comments
MarksCode
Thanks for the suggestion! The only bad thing about this is it takes another array's worth of memory, but luckily my array isn't very big at all.
Rajshekar Reddy
For compatibility issues, please note that Array.map() method is not available in IE8 and below
You can simply use the Number object.
ḷet res = ['2', '10', '11'].map(Number);
Comments
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);
});
Comments
The simplest way to parse int from string is adding a + sign before:
var res = ['1', '2', '3'].map(function(v){return +v})
