Question

Is there an equivalent for ruby’s array[n..m] in JavaScript?

For example:

>> a = ['a','b','c','d','e','f','g']
>> a[0..2]
=> ['a','b','c']

Answer 1

Use the array.slice(begin [, end]) function.

var a = ['a','b','c','d','e','f','g'];
var sliced = a.slice(0, 3); //will contain ['a', 'b', 'c']

The last index is non-inclusive; to mimic ruby’s behavior you have to increment the end value. So I guess slice behaves more like a[m...n] in ruby.