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Asked: 2026-05-28T01:26:42+00:00

I’m wondering about why isn’t advisable to use array declaration by: var arr =

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I’m wondering about why isn’t advisable to use array declaration by:

 var arr = new Array()

as I thought declaring by [] was supposed to be protected in case of overwrite Array but…

Array = 1;
var arr = [] // boom  
TypeError: Cannot read property 'slice' of undefined

Personally, I prefer using var arr = [],
but now I don’t know what is the advantage of using [] instead of Array except that write faster.

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1 Answer

  1. Editorial Team

    as I thought declaring by [] was supposed to be protected in case of overwrite Array but…

    It is under EcmaScript 5 but not under EcmaScript 3, so it won’t be on older browsers.

    The relevant portion of the spec is http://es5.github.com/#x11.1.4

    1. Let array be the result of creating a new object as if by the expression new Array() where Array is the standard built-in constructor with that name.

    The bolded text was added in EcmaScript 5 but was not present in EcmaScript 3.

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