Ruby | Enumerable grep() function

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]