Array#keep_if():keep_if()是一个Array类方法,它返回满足给定条件的数组元素。
用法:Array.keep_if()
参数:数组
返回:满足给定条件的数组元素。
示例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]
示例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]
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