Revisions to How do I check if a variable is an array in JavaScript?

Rollback to Revision 7

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edited May 29, 2021 at 4:32

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350

You could also use:

if (value instanceof Array) {
  alert('value is Array!');
} else {
  alert('Not an array');
}

This seems to me a pretty elegant solution, but to each his own.

Edit:

As of ES5 there is now also:

Array.isArray(value);

But this will break on older browsers, unless you are using polyfills (basically... IE8 or similar).

Compare Methods

You could also use:

if (value instanceof Array) {
  alert('value is Array!');
} else {
  alert('Not an array');
}

This seems to me a pretty elegant solution, but to each his own.

Edit:

As of ES5 there is now also:

Array.isArray(value);

But this will break on older browsers, unless you are using polyfills (basically... IE8 or similar).

Compare Methods

You could also use:

if (value instanceof Array) {
  alert('value is Array!');
} else {
  alert('Not an array');
}

This seems to me a pretty elegant solution, but to each his own.

Edit:

As of ES5 there is now also:

Array.isArray(value);

But this will break on older browsers, unless you are using polyfills (basically... IE8 or similar).

Added comparison

Source Link

edited May 18, 2021 at 22:38

dthree

20.9k
14
81
114

You could also use:

if (value instanceof Array) {
  alert('value is Array!');
} else {
  alert('Not an array');
}

This seems to me a pretty elegant solution, but to each his own.

Edit:

As of ES5 there is now also:

Array.isArray(value);

But this will break on older browsers, unless you are using polyfills (basically... IE8 or similar).

Compare Methods

You could also use:

if (value instanceof Array) {
  alert('value is Array!');
} else {
  alert('Not an array');
}

This seems to me a pretty elegant solution, but to each his own.

Edit:

As of ES5 there is now also:

Array.isArray(value);

But this will break on older browsers, unless you are using polyfills (basically... IE8 or similar).

You could also use:

if (value instanceof Array) {
  alert('value is Array!');
} else {
  alert('Not an array');
}

This seems to me a pretty elegant solution, but to each his own.

Edit:

As of ES5 there is now also:

Array.isArray(value);

But this will break on older browsers, unless you are using polyfills (basically... IE8 or similar).

Compare Methods

Rollback to Revision 5

Source Link

edited Aug 4, 2017 at 20:41

Brett Bender

19.8k
2
40
46

You could also use:

if (value instanceof Array) {
  alert('value is Array!');
} else {
  alert('Not an array');
}

This seems to me a pretty elegant solution, but to each his own.

Edit:

As of ES5ES5 there is now also:

Array.isArray(value);

But this will break on older browsers, unless you are using polyfills (basically... IE8 or similar).

You could also use:

if (value instanceof Array) {
  alert('value is Array!');
} else {
  alert('Not an array');
}

This seems to me a pretty elegant solution, but to each his own.

Edit:

As of ES5 there is now also:

Array.isArray(value);

But this will break on older browsers, unless you are using polyfills (basically... IE8 or similar).

You could also use:

if (value instanceof Array) {
  alert('value is Array!');
} else {
  alert('Not an array');
}

This seems to me a pretty elegant solution, but to each his own.

Edit:

As of ES5 there is now also:

Array.isArray(value);

But this will break on older browsers, unless you are using polyfills (basically... IE8 or similar).

added 4 characters in body

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edited May 29, 2017 at 6:09

Arpit Aggarwal

29.5k
16
97
110

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Added note to include ES5 convenience method for this

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edited Sep 12, 2016 at 17:18

Brett Bender

19.8k
2
40
46

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Indentation

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edited Apr 13, 2016 at 15:02

Brett Bender

19.8k
2
40
46

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Rollback to Revision 1

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edited Apr 11, 2016 at 14:35

Brett Bender

19.8k
2
40
46

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added 6 characters in body

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edited Aug 13, 2015 at 23:25

Nathaniel Ford

21.3k
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98
112

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answered Apr 20, 2009 at 9:05

Brett Bender

19.8k
2
40
46

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