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Ruby | Enumerable grep() function

  • Last Updated : 05 Dec, 2019

The grep() of enumerable is an inbuilt method in Ruby returns an array of elements which contain every (element == pattern), of all the elements in the pattern. If the optional block is not given, then it returns an array containing the elements in that pattern.

Syntax: enu.grep(pattern) { |obj| block }

Parameters: The function takes a pattern and an optional block.

Return Value: It returns either an array of boolean values or an array containing the elements that are contained in the enumerable.

Example 1:






# Ruby program for grep method in Enumerable
  
# Initialize 
enu = (1..10)
  
# Prints
enu.grep (3..5)

Output:

[3, 4, 5]

Example 2:




# Ruby program for grep method in Enumerable
  
# Initialize 
enu = (1..10)
  
# Prints
enu.grep (3..5) { |obj| obj % 2 == 1 }

Output:

[true, false, true]
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