Ruby/Array/Array.new
Материал из Wiki.crossplatform.ru
Содержание |
Array initialized by copying
squares = Array.new(5) {|i| i*i} copy = Array.new(squares) # initialized by copying p squares[5] = 25
Array.new(2) creates an array with two nil values
p Array.new(2)
Array.new(5, "A") fills an array with five a
p Array.new(5, "A")
Array.new creates an empty array
p Array.new
Array with Array.new
empty = Array.new # []: returns a new empty array nils = Array.new(3) # [nil, nil, nil]: new array with 3 nil elements zeros = Array.new(4, 0) # [0, 0, 0, 0]: new array with 4 0 elements copy = Array.new(nils) # Make a new copy of an existing array count = Array.new(3) {|i| i+1} # [1,2,3]: 3 elements computed from index
Create an array of hashes
a = Array.new(2, Hash.new) a[0]["cat"] = "feline" p a a[1]["cat"] = "Felix" p a
Fill an array of hashes
a = Array.new(2) { Hash.new } # Multiple instances p a[0]["cat"] = "feline"
