红宝石 |可枚举的 min_by()函数

enumerable的min_by()是 Ruby 中的一个内置方法，它返回一个满足给定块条件的最小元素数组。当没有给出块时，它返回一个枚举器。

Syntax: enu.min_by(n) { |obj| block }

Parameters: The function takes two parameters n and block. N signifies the number of minimum elements and block signifies the condition.

Return Value: It returns a min element or an array containing N min elements.

示例 #1 ：

# Ruby program for min_by method in Enumerable
  
# Initialize 
a = ["gopal", "tunday", "geeks", "classes", "linux"]
  
# Prints
p a.min_by(2) {|obj| obj.length }
  
p a.min_by {|obj| obj.length }

输出：

["geeks", "gopal"]
"gopal"

示例 #2 ：

# Ruby program for min_by method in Enumerable
  
# Initialize 
a = ["gopal", "tunday", "geeks", "classes", "linux"]
  
# Prints
p a.min_by(2) 
  
p a.min_by 

输出：

Enumerator: ["gopal", "tunday", "geeks", "classes", "linux"]:min_by(2)
Enumerator: ["gopal", "tunday", "geeks", "classes", "linux"]:min_by