Ruby | Enumerable grep() function

Last Updated : 12 Jul, 2025
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 
# Ruby program for grep method in Enumerable

# Initialize 
enu = (1..10)

# Prints
enu.grep (3..5)
Output: 
[3, 4, 5]
Example 2: ruby 
# 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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