Create array of n items based on integer value

Question

Given I have an integer value of, e.g., 10.

How can I create an array of 10 elements like [1,2,3,4,5,6,7,8,9,10]?

Answer 1

About comments with tricky methods:

require 'benchmark'

Benchmark.bm { |x|
  x.report('[*..] ') do
    [*1000000 .. 9999999]
  end  

  x.report('(..).to_a') do
    (1000000 .. 9999999).to_a
  end

  x.report('Array(..)') do
    Array(1000000 .. 9999999)
  end

  x.report('Array.new(n, &:next)') do
    Array.new(8999999, &:next)
  end

}

Be careful, this tricky method Array.new(n, &:next) is slower while three other basic methods are same.

                           user     system      total        real
[*..]                  0.734000   0.110000   0.844000 (  0.843753)
(..).to_a              0.703000   0.062000   0.765000 (  0.843752)
Array(..)              0.750000   0.016000   0.766000 (  0.859374)
Array.new(n, &:next)   1.250000   0.000000   1.250000 (  1.250002)