Javascript - One array contains another

Question

If i have two arrays like so:

var array1 = ['this', 'is', 'array', '1']
var array2 = ['this', 'is', '1']

Is there a built in function that can determine if array1 contains array2. Which in this case it does.

Alternatively some intersect function or similar?

See http://stackoverflow.com/questions/1885557/simplest-code-for-array-intersection-in-javascript for discussion re: array intersect — secretformula, May 21 '14 at 20:01
Do you want an efficient solution, or a short (easy to read) one? And will they always contain strings? — Ry-, May 21 '14 at 20:02
Short and easy to read is fine as its dealing with very small arrays. They will always be strings yeah. — Marty Wallace, May 21 '14 at 20:04

score 0 · Answer 1 · answered May 21 '14 at 20:03

0

try this with underscore (library based on javascript) http://underscorejs.org/

_.every(array1, function(e){ return _.include(array2, e)}); //=> false
_.every(array2, function(e){ return _.include(array1, e)}); //=> true

answered May 21 '14 at 20:03

1

Oh, so like `array2.every(function (e) { return array1.indexOf(e) !== -1; });`? – Ry- May 21 '14 at 20:04
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Doesn't Underscore have an intersection function built in? – Pointy May 21 '14 at 20:04
Yes it does have, as Lodash – Vitor Tyburski May 21 '14 at 20:07

1 Answers1