ruby 可枚举的每个和地图

Posted 2021-05-15

# .each performs an operation on each element of the object
# NO new array is returned 

doubled_array = (1..4).each { |num| num * 2 }

# .map performs an operation each element of an object and return a new array

uppercase_array = [‘alex’, ‘magana’, ‘gatobu’].map { |name| name.upcase }