convert array of numbers that are strings into array of numbers

Question

ids_nn
["50348", "18646", "17963", "18184", "30703", "18016", "23225"]

How do I make it:

[50348, 18646, 17963, 18184, 30703, 18016, 23225]

I read these two SO posts:

How to convert all elements in an array to integer in JavaScript?

convert string into array of integers

So, I tried:

var bla = ids_nn.map(function (x) { return parseInt(x, 10})
VM4765:2 Uncaught SyntaxError: Unexpected token }message: "Unexpected token }"stack: (...)get stack: function () { [native code] }set stack: function () { [native code] }__proto__: ErrorVM3550:847 InjectedScript._evaluateOnVM3550:780 InjectedScript._evaluateAndWrapVM3550:646 InjectedScript.evaluate

and

var bla = ids_nn.split(',').map(Number)
VM4648:2 Uncaught TypeError: undefined is not a function

Your first try just has a missing `)` for the `parseInt` method. Other than that its just fine. — Jamiec, Jul 23 '15 at 15:24
What's unclear about "VM4765:2 Uncaught SyntaxError: Unexpected token }"? — amiuhle, Jul 23 '15 at 15:27

score 0 · Answer 1 · answered Jul 23 '15 at 15:24

Change it into

var bla = ids_nn.map(function (x) { return parseInt(x, 10)})
VM4765:2 Uncaught SyntaxError: Unexpected token }message: "Unexpected token }"stack: (...)get stack: function () { [native code] }set stack: function () { [native code] }__proto__: ErrorVM3550:847 InjectedScript._evaluateOnVM3550:780 InjectedScript._evaluateAndWrapVM3550:646 InjectedScript.evaluate

score 0 · Answer 2 · answered Jul 23 '15 at 15:25

0

var bla = ids_nn.map(function (x) { return parseInt(x, 10})

so close - here's what you should've done

var bla = ids_nn.map(function (x) { return parseInt(x, 10)})

one ) missing

answered Jul 23 '15 at 15:25

Jaromanda X

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score 0 · Answer 3 · answered Jul 23 '15 at 15:26

0

This works for me

var bla = ids_nn.map(function (x) { return parseInt(x) });

You had a mistake with the } and ), but anyway you don't need to pass the base

answered Jul 23 '15 at 15:26

Manjar

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Thanks, am reading the documentation just now. Don;t get it, why don;t I need to specify decimal with 10? – Doug Fir Jul 23 '15 at 15:29
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If the radix parameter is omitted, JavaScript assumes the following: In the parseInt documentation of w3schools I see: If the string begins with "0x", the radix is 16 (hexadecimal) If the string begins with "0", the radix is 8 (octal). This feature is deprecated If the string begins with any other value, the radix is 10 (decimal) http://www.w3schools.com/jsref/jsref_parseint.asp – Manjar Jul 23 '15 at 15:32
So you only had to specify base if your number starts with 0x prefix like "0x123A" which means you wanted it in hexadecimal – Manjar Jul 23 '15 at 15:33

score 0 · Accepted Answer · answered Apr 04 '18 at 11:37

0

You can do

var arrayOfNumbers = arrayOfStrings.map(Number);

MDN Array.prototype.map

For older browsers which do not support Array.map, you can use Underscore

var arrayOfNumbers = _.map(arrayOfStrings, Number);

answered Apr 04 '18 at 11:37

Jonas Anseeuw

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convert array of numbers that are strings into array of numbers

4 Answers4