CODEWITHSUNDEEP
javascriptjquery
user1679941
user1679941

Reputation:

What do brackets inside brackets mean in Javascript?

I have the following code:

oTable.fnSort([[columnIndex, 'asc']]);

Can someone explain to me what the ([[]]) means. I have never seen brackets inside of brackets before.

Upvotes: 0

Views: 562

Answers (2)

James Allardice
James Allardice

Reputation: 165941

You're passing an array to the fnSort method. That array contains one element, which happens to be another array, with two elements:

[] // An empty array
[[]] // An array with one element (an empty array)
[[columnIndex, "asc"]] // An array with one element (an array with 2 elements)

This is known as array literal syntax, which is generally preferred to the alternative (the Array constructor).

Upvotes: 4

Jon
Jon

Reputation: 437336

Square brackets are notation for a JavaScript array. This code means that the argument to the function is an array that contains one element, which is an array itself.

An array with two elements:

[columnIndex, 'asc']

An array with one element, which is an array that contains two elements:

[[columnIndex, 'asc']]

Upvotes: 3

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