红宝石 |数组计数（）操作

Array#count() : count()是一个 Array 类方法，它返回数组中元素的数量。它还可以找到数组中特定元素的总数。

Syntax:  Array.count()

Parameter:  obj - specific element to found

Return:  removes all the nil values from the array. 

代码 #1：count() 方法的示例

# Ruby code for count() method
# to count elements
  
# 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]
  
# counting total elements
puts "counting : #{a.count}\n\n"
  
# counting 1
puts "counting : #{b.count(1)}\n\n"
  
# counting 'nil'
puts "counting : #{c.count(nil)}\n\n"

输出 ：

counting : 6

counting : 3

counting : 2

代码 #2：count() 方法的示例

# Ruby code for count() method
# to count elements
  
# declaring array
a = ["abc", "nil", "dog"]
  
# declaring array
b = ["cow", nil, "dog"]
  
# declaring array
c = ["cat", nil, nil]
  
# counting total elements
puts "counting : #{a.count}\n\n"
  
# counting 1
puts "counting : #{b.count(1)}\n\n"
  
# counting 'nil'
puts "counting : #{c.count(nil)}\n\n"

输出 ：

counting: 3

counting : 0

counting : 2