红宝石 |数组类 each_index() 操作

Array#each_index() : each_index()是一个 Array 类方法，它通过对 self 中的 each_index 元素执行一次给定块中的条件来返回数组元素的索引。

Syntax:  Array.each_index()

Parameter:  block - condition to follow

Return:  index of the array element following the condition

代码 #1：each_index() 方法的示例

# Ruby code for each_index() method
  
# declaring array
a = ["abc", "nil", "dog"]
  
# declaring array
b = ["hello", "hi", "dog"]
  
# each_index
puts "each_index : #{a.each_index {|x| print x, " -- "}}\n\n"

输出 ：

0 -- 1 -- 2 -- each_index : ["abc", "nil", "dog"]

代码 #2：each_index() 方法的示例

# Ruby code for each_index() method
  
# declaring array
a = ["abc", "nil", "dog"]
  
# declaring array
b = ["hello", "hi", "dog"]
  
  
# each_index
puts "each_index : #{b.each_index{|x| x = 2}}\n\n"
     

输出 ：

each_index : ["hello", "hi", "dog"]