How to trim the leading zero in a number in JavaScript

Jul 5, 2018

Learn how to trim the leading zero from a number in JavaScript, using parseInt() with radix 10, the unary plus operator, or a regular expression like /^0+/.

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If you have a number with a leading zero, like 010 or 02, how to remove that zero?

There are various ways.

The most explicit is to use parseInt():

parseInt(number, 10)

10 is the radix, and should be always specified to avoid inconsistencies across different browsers, although some engines work fine without it.

Another way is to use the + unary operator:

+number

Those are the simplest solutions.

You can also go the regular expression route, like this:

number.replace(/^0+/, '')

Tagged: JavaScript · All topics

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