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@aubergene
Last active September 9, 2016 20:41
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underscore array rotate
/**
* Underscore function to rotate an array
* See also _.cycle https://gist.github.com/901648
*
* _.rotate([1, 2, 3, 4, 5]);
* => [2, 3, 4, 5, 1]
* _.rotate([1, 2, 3, 4, 5], 3);
* => [4, 5, 1, 2, 3]
* _.rotate([1, 2, 3, 4, 5], -3);
* => [3, 4, 5, 1, 2]
* _.rotate([1, 2, 3, 4, 5], 6);
* => [2, 3, 4, 5, 1]
*/
_.mixin({
rotate: function(array, n, guard) {
var head, tail;
n = (n == null) || guard ? 1 : n;
n = n % array.length;
tail = array.slice(n);
head = array.slice(0, n);
return tail.concat(head);
}
});
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