红宝石 |数组长度（）函数

Array#length() : length()是一个 Array 类方法，它返回数组中元素的数量。

Syntax: Array.length()

Parameter: Array

Return: the number of elements in the array.

示例 #1：

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

输出 ：

length() method form : 6

length() method form : 6

length() method form : 4

示例 #2：

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

输出 ：

length() method form : 3

length() method form : 3

length() method form : 2