CODEWITHSUNDEEP
ruby
NullVoxPopuli
NullVoxPopuli

Reputation: 65123

Create an array with evenly-spaced values

What is an easy way to generate an array that has values with a fixed distance between them?

For example:

1, 4, 7, 10,... etc

I need to be able to set start, end, and step distance.

Upvotes: 8

Views: 3078

Answers (2)

Phrogz
Phrogz

Reputation: 303205

In Ruby 1.9:

1.step(12).to_a   #=> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]
1.step(12,3).to_a #=> [1, 4, 7, 10]

Or you can splat instead of to_a:

a = *1.step(12,3)  #=> [1, 4, 7, 10]

Upvotes: 4

Mark Byers
Mark Byers

Reputation: 838126

Try using Range.step:

> (1..19).step(3).to_a
=> [1, 4, 7, 10, 13, 16, 19]

Upvotes: 20

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