How to convert a number 010 to a string "010"

Question

While executing some random expressions in console, I just found that

010 + "" returning 8 (even 011,0100.. are returning results by considering octal number system)

What would I have to do if I want to convert a number 010 to a string "010"? Not only for 010 but for every similar numbers. I managed to find a kind of similar explanation for this here. But that is not explaining how to convert it into a exact string version.

@BipBip , Jay : "+" will basically do `.toString()` internally when it meets a string. `010 + ""` is equal to `(010).toString()` Do a quick test in your console. — Rajaprabhu Aravindasamy, Feb 12 '16 at 10:38
You should convert you number to string and manipulate it as a string. num.toString() should work for you. — C Cislariu, Feb 12 '16 at 10:39
Assuming first it converts the number to string because is in binary format it converts it to`(010.toString() = 8)`. — Alex Char, Feb 12 '16 at 10:39
may b duplicate of http://stackoverflow.com/questions/6718102/in-javascript-eval010-returns-8 — Dhara, Feb 12 '16 at 10:46

gurvinder372 · Answer 1 · 2016-02-12T10:47:33.570

6

Get a string first by invoking the toString() method with the base number which is 8 in this case

Number(010).toString(8); //outputs "10"

it works without wrapping in Number too,

010.toString(8); //outputs "10"

use this method to padd 0's if you know the length of original number

function pad(n,digits){return n<Math.pow(10, digits) ? '0'+n : n}

so

pad(Number(010).toString(8),3); //3 is the number of digits

edited Feb 12 '16 at 10:47

answered Feb 12 '16 at 10:43

gurvinder372

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no need (in my testing), to wrap in `Number()`: `010.toString(8)`. – Davin Tryon Feb 12 '16 at 10:44
also, I'm not sure that padding will work with the OP input of `010`. – Davin Tryon Feb 12 '16 at 10:47
@DavinTryon made the changes to pass the number of digits, thanks – gurvinder372 Feb 12 '16 at 10:49

score 6 · Accepted Answer · answered Feb 12 '16 at 10:45

6

In Javascript 010 is octal literal and converts to 8 in decimal literal. In fact, you should avoid it, as strict mode disallows to use it.

There is no way to distinguish between octal and decimal notation other than parsing function body string :)

answered Feb 12 '16 at 10:45

Cezary Daniel Nowak

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score 3 · Answer 3 · answered Feb 12 '16 at 10:48

Use the following code:

"0" + (010).toString(8)  // "010"
"0" + (0111).toString(8) // "0111"

And a more general solution:

function toStringOctal(number) {
  return "0" + number.toString(8);
}

toStringOctal(010) // return "010"

But notice that in strict mode octal notations 0<number> are not allowed.

millerbr · Answer 4 · 2016-02-12T10:44:11.757

1

var num = 10;
var string = "0" + num.toString();
console.log(string);//gives you "010"

As mentioned in the comments to this post, it won't convert 010 directly, but will build a string. Not the most elegant solution.

edited Feb 12 '16 at 10:44

answered Feb 12 '16 at 10:41

millerbr

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what about 0111/010001 etc? – Rajaprabhu Aravindasamy Feb 12 '16 at 10:44
Just do the same but with the new numbers, so `var num = 111` or `var num = 10001` – millerbr Feb 12 '16 at 10:46

score 1 · Answer 5 · answered Feb 12 '16 at 13:35

If you are looking to convert multiple similar numbers into strings, you could also build a simple function that will do the work when called:

function convertSomething(number) {
    var string = "" + number;
    return string
}

Then you can just call your conversion function whenever you need it.

How to convert a number 010 to a string "010"

5 Answers5

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