红宝石 |可枚举的 max_by()函数

enumerable的max_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大元素数组。当没有给出块时，它返回一个枚举器。

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

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

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

示例 1 ：

Ruby

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

输出：

["classes", "tunday"]
"classes"

示例 2 ：

红宝石

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

输出：

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