在Ruby中动态创建数组

array = []

array = [1, 2, 3]

array = Array.new

array = Array(1..5) #=> [1, 2, 3, 4, 5]

array = [1] * 5 #=> [1, 1, 1, 1, 1]

array = [1, 2, 3]
array << 4 #=> [1, 2, 3, 4]

array = [1, 2, 3]
array.push(4) #=> [1, 2, 3, 4]

array = [1, 2, 3]
array.pop #=> [1, 2]

array = [1, 2, 3]
array.shift #=> [2, 3]

array = [1, 2, 3]
array.unshift(0) #=> [0, 1, 2, 3]

array = [1, 2, 3]
array.length #=> 3
array.size #=> 3

array = []
array.empty? #=> true

array = [1, 2, 3]
array.include?(2) #=> true

array = [1, 2, 3]
array.join('-') #=> "1-2-3"

array = [1, 2, 3]
array.each do |element|
  puts element
end

array = [1, 2, 3]
mapped_array = array.map do |element|
  element * 2
end
puts mapped_array.inspect #=> [2, 4, 6]

array = [1, 2, 3, 4, 5]
selected_array = array.select do |element|
  element.even?
end
puts selected_array.inspect #=> [2, 4]

array = [3, 1, 2]
sorted_array = array.sort
puts sorted_array.inspect #=> [1, 2, 3]

array = [1, 2, 3]
reversed_array = array.reverse
puts reversed_array.inspect #=> [3, 2, 1]

array = [1, 2, 2, 3, 3]
unique_array = array.uniq
puts unique_array.inspect #=> [1, 2, 3]