Why does passing 0 to the radix of parseInt in Javascript return decimal values?

Question

Consider the following expression

console.log( 'result: ' + parseInt("1", 0) )

It returns 1 in the console of chrome (basically returns the decimal value).

The MDN docs for parseInt says

Or NaN when the radix is smaller than 2 or bigger than 36 ...

It would be great if someone could give an explanation for this.

Thanks in advance.

Barmar · Accepted Answer · 2021-09-15 15:14:59Z

2

MDN is summarizing the specification, and is not complete.

The actual specification says:

If radix is undefined or 0, it is assumed to be 10 except when the number begins with the code unit pairs 0x or 0X, in which case a radix of 16 is assumed.

answered Sep 15, 2021 at 15:14

Barmar

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1 Comment

Isuru Dharmadasa Over a year ago

Thank you. I also found a similar answer here -> developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/… Turns out, I had to read further down. LOL.

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