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Asked: 2026-05-30T03:34:09+00:00

What is this for: arr.length >>> 0 And why should I want to use

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What is this for:

arr.length >>> 0

And why should I want to use it?

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1 Answer

  1. Editorial Team

    It’s the unsigned right shift operator. In this case (when used with 0) it ensures that arr.length is an integer, or rather, evaluates to arr.length as strict unsigned 32-bit integer value. (This means it’s never NaN, never negative, and never has a decimal part.)

    Examples:

    '1'       >>> 0: 1
1         >>> 0: 1
''        >>> 0: 0
undefined >>> 0: 0
null      >>> 0: 0
1.0∙∙∙01  >>> 0: 1

    Compare to:

    Number('1')      : 1
Number(1)        : 1
Number('')       : 0
Number(undefined): NaN
Number(null)     : 0
Number(1.0∙∙∙01) : 1.0∙∙∙01

    It’s just there to ensure that the right length is being used.

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