红宝石 |数组类包含？() 操作

Array#include?() : include?()是一个 Array 类方法，用于检查参数对象是否存在于数组中。

Syntax: Array.include?()

Parameter: obj – element to find

Return: true – if the element is present; otherwise false

代码 #1：include?() 方法的示例

# Ruby code for include?() method
  
# declaring array
a = [18, 22, 33, nil, 5, 6]
  
# declaring array
b = [1, 4, 1, 1, 88, 9]
  
# declaring array
c = [18, 22, nil, nil, 50, 6]
  
# include?
puts "include? : #{a.include?(5)}\n\n"
  
# include?
puts "include? : #{b.include?(0)}\n\n"
  
# include?
puts "include? : #{c.include?(nil)}\n\n"

输出 ：

include? : true

include? : false

include? : true

代码 #2：include?() 方法的示例

# Ruby code for include?() method
  
# declaring array
a = ["abc", "nil", "dog"]
  
# declaring array
b = ["cow", nil, "dog"]
  
# declaring array
c = ["cat", nil, nil]
  
# include?
puts "include? : #{a.include?("cat")}\n\n"
  
# include?
puts "include? : #{b.include?("nil")}\n\n"
  
# include?
puts "include? : #{c.include?("cat")}\n\n"

输出 ：

include? : false

include? : false

include? : true