- Create array of items
- Create array with Array.new
- SymbolProc
- Array of Array
- Array of Hash
- Array of Object
- Reference
Create array of items
How can we create an array of 10 items in Ruby?
ary = []
10.times { |i| ary << i }
p ary # => [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
This code can be refactored with Array.new:
Array.new(10) { |i| i }
# => [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
Create array with Array.new
The initial value is nil.
Array.new(3) #=> [nil, nil, nil]
SymbolProc
Array.new(10, &:to_s)
# => ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9"]
Array of Array
Array.new(3) {Array.new(3)}
#=> [[nil, nil, nil], [nil, nil, nil], [nil, nil, nil]]
Array of Hash
Array.new(4) {Hash.new}
#=> [{}, {}, {}, {}]
Array of Object
Array.new(5, User.new)
=> [#<User id: nil, name: nil, email: nil, created_at: nil, updated_at: nil>, #<User id: nil, name: nil, email: nil, created_at: nil, updated_at: nil>, #<User id: nil, name: nil, email: nil, created_at: nil, updated_at: nil>, #<User id: nil, name: nil, email: nil, created_at: nil, updated_at: nil>, #<User id: nil, name: nil, email: nil, created_at: nil, updated_at: nil>]