Ruby 矩阵count()操作

Array#count() : count()是一个数组类方法，用于返回数组中元素的数量。它还可以找到数组中某个特定元素的总数。

语法。 Array.count()

参数：obj – 要找到的特定元素

返回：从数组中删除所有的nil值。

代码 #1 : count()方法的例子

# 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()方法的例子

# 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: