How to loop through an array using .each starting at an index in Ruby

Question

Ok, so we all know that you can do the following:

array.each{ |value|
    puts value
}

What if, however, I want to start at element n instead of starting at the beginning; i.e. n=0.

user3723506 · Accepted Answer · 2016-09-25 01:08:13Z

2

You can also do

array.drop(n).each { |v| puts v }

answered Sep 25, 2016 at 1:08

user3723506

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2 Comments

Is drop mutative; that is, if I call upon it again will the 0...n-1 entries still be there?

drop doesn't modify the original array

Matthew Galloway · Accepted Answer · 2016-09-25 00:31:39Z

1

You can call a subarray with a range like this:

array[n..-1].each { |value| puts value }

Where n is the index you'd like to start at, and -1 will always point to the last index of an array.

answered Sep 25, 2016 at 0:31

Matthew Galloway

1574 bronze badges

...or insert next if value < n, which avoids the need to create the temporary array array[n..-1]. You could also write puts array[n..-1].