Ruby 数组keep_if()函数

Array#keep_if() : keep_if()是一个数组类方法，用于返回满足给定条件的数组元素。

语法。Array.keep_if()

参数。数组

返回：满足给定条件的数组元素。

例子 #1 :

# Ruby code for keep_if() 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]
  
# keep_if
puts "keep_if method : #{a.keep_if {|num| num > 10 }}\n\n"
  
# keep_if
puts "keep_if method : #{b.keep_if {|x| x.odd? }}\n\n"

输出:

keep_if method : [18, 22, 33]

keep_if method : [1, 1, 1, 9]

例子 #2 :

# Ruby code for keep_if() 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]
  
# keep_if
puts "keep_if method : #{c.keep_if {|num| num > 10 }}\n\n"
  
# keep_if
puts "keep_if method : #{c.keep_if {|num| num.even? }}\n\n"

输出:

keep_if method : [18, 22, 53]

keep_if method : [18, 22]