红宝石 |数组映射!()操作
Array#map!() : map!()是一个 Array 类方法,它返回一个包含块返回值的新数组。
Syntax: Array.map!()
Parameter: Array
Return: a new array containing the values returned by the block.
示例 #1:
# Ruby code for map!() method
# declaring array
a = [18, 22, 33, 3, 5, 6]
# declaring array
b = [1, 4, 1, 1, 88, 9]
# declaring array
c = [18, 22, 3, 3, 50, 6]
# map!
puts "map! method : #{a.map! {|num| num > 10 }}\n\n"
# map!
puts "map! method : #{b.map! {|x| x.odd? }}\n\n"
输出 :
map! method : [true, true, true, false, false, false]
map! method : [true, false, true, true, false, true]
示例 #2:
# Ruby code for map!() method
# declaring array
a = [18, 22, 33, 3, 5, 6]
# declaring array
b = [1, 4, 1, 1, 88, 9]
# declaring array
c = [18, 22, 3, 3, 53, 6]
# map!
puts "map! method : #{c.map! {|num| num > 10 }}\n\n"
# map!
puts "map! method : #{a.map! {|num| num > 10 }}\n\n"
输出 :
map! method : [true, true, false, false, true, false]
map! method : [true, true, true, false, false, false]