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Ruby | Array class find_index() operation
  • Last Updated : 08 Jan, 2020

Array#find_index() : find_index() is a Array class method which returns the index of the first array. If a block is given instead of an argument, returns the index of the first object for which the block returns true.

Syntax:  Array.find_index()

Parameter:  block - condition to follow

Return:  index value of the array elements

Code #1 : Example for find_index() method

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# Ruby code for find_index() method
  
# 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]
  
# find_index
puts "find_index : #{a.find_index(5)}\n\n"
  
# find_index
puts "find_index : #{b.find_index(4)}\n\n"
  
# find_index
puts "find_index : #{c.find_index(nil)}\n\n"

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Output :

find_index : 4

find_index : 1

find_index : 2

Code #2 : Example for find_index() method

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

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Output :

find_index : 0

find_index : 1

find_index : 1



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