Today I Learned

hashrocket A Hashrocket project

Difference betweent `to_a` and `to_ary`

  • to_a => called for explicit conversions
  • to_ary => called for implicit conversions


class Coordinates
  attr_reader :x, :y
  def initialize(x, y)
    @x, @y = x, y

  def to_a
    puts "to_a called"
    [x, y]

  def to_ary
    puts "to_ary called"
    [x, y]

coordinates =, 7)

puts "splat"
a = *coordinates
# => to_a called

puts "multiple assignment"
x, y = coordinates
# => to_ary called

puts "Implicit conversion into block params"
[coordinates].each { |(x, y)| puts x }
# => to_ary called
See More #ruby TILs
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