Ruby Array keep_if()用法及代碼示例

Array＃keep_if()：keep_if()是一個Array類方法，它返回滿足給定條件的數組元素。

用法：Array.keep_if()

參數：數組

返回：滿足給定條件的數組元素。

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"

輸出：

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"

輸出：

keep_if method : [18, 22, 53]

keep_if method : [18, 22]

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