convert string generated from Number.toString to number

Question

I use Number.toString method to convert numbers to string.

Number(100).toString(16);
Number(1000).toString(36);

How can I convert them back to the original numbers?

http://stackoverflow.com/questions/1337419 or http://stackoverflow.com/questions/10258828 already have your answer. — Sebastian Simon, Jun 21 '15 at 04:20

score 2 · Accepted Answer · answered Jun 21 '15 at 04:12

2

By using parseInt.

parseInt(Number(100).toString(16), 16);
parseInt(Number(1000).toString(36), 36);

answered Jun 21 '15 at 04:12

Oka

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2

I feel really stupid since I've already tried `parseInt` with radix `10`. Thanks for your answer. – Lewis Jun 21 '15 at 04:19

papiro · Answer 2 · 2018-11-20T14:13:32.830

Number("10") === 10

You can pass any string into Number and it will turn it into a number object. I prefer this method since if it contains any non-number characters, it will resolve to NaN which is what you want most of the time.

If you're parsing a string which begins with a number but may contain alpha characters afterwards, parseInt and parseFloat both will parse the leading numerics out - but you can forget about any numbers which may be mixed into the string elsewhere.

convert string generated from Number.toString to number

2 Answers2