How to create an integer or number from array of digits or string of digits in JavaScript

Question

I want to create an integer or number that contains all the digits from an array of digits or string. How can I achieve that ?

for example:

digitArry = [9', '8', '7', '4', '5', '6'];

should become

integer = 987456;

Already answered in How do I convert a string into an integer in JavaScript? — Den Isahac
– Den Isahac, Commented Jul 5, 2017 at 17:46
What should be the result of ['95', '3'] or ['9', '000001']? — ibrahim mahrir
– ibrahim mahrir, Commented Jul 5, 2017 at 17:52

Alberto Trindade Tavares · Accepted Answer · 2017-07-05 17:51:03Z

6

You can use join and parseInt:

var digitArry = ['9', '8', '7', '4', '5', '6'];
var integer = parseInt(digitArry.join(''), 10);

console.log(integer);

EDIT: As suggested by @kay, another alternative is using + to convert string to number:

var digitArry = ['9', '8', '7', '4', '5', '6'];
var integer = +digitArry.join('');

console.log(integer);

answered Jul 5, 2017 at 17:44

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8 Comments

Just nitpicking, but it's always a good idea to specify the radix in the parseInt method, even if base10 is the default.

Don't forget to pass 10 as the base

Make sure to specify the second parameter in parseInt, since some browser do not use the base 10 by default.

Never use parseInt without specifying the radix. Almost always +str is the better alternative.

@JeffNoel This has nothing to do with the browser. It's when the string starts with a 0

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