How to Remove Items from Set based on a Condition in Ruby - Step by Step Examples

How to Remove Items from Set based on a Condition in Ruby ?

Answer

To remove items from a set based on a condition in Ruby, you can use the delete_if method which evaluates a block and deletes elements for which the block returns true.


✐ Examples

1 Remove Even Numbers from a Set

In this example,

  1. First, we create a set named number_set using the Set class and initialize it with a collection of integers: number_set = Set.new([1, 2, 3, 4, 5]).
  2. Next, we call the delete_if method on the set and pass a block that checks if each number is even.
  3. If the block returns true (i.e., the number is even), the delete_if method removes that number from the set.
  4. We print the updated set to verify that even numbers have been removed.

Ruby Program

require 'set'

number_set = Set.new([1, 2, 3, 4, 5])
puts "Original Set: #{number_set.to_a}"

number_set.delete_if { |num| num.even? }

puts "Set after removing even numbers: #{number_set.to_a}"

Output

Original Set: [1, 2, 3, 4, 5]
Set after removing even numbers: [1, 3, 5]

2 Remove Strings Longer Than 4 Characters from a Set

In this example,

  1. First, we create a set named string_set using the Set class and initialize it with a collection of strings: string_set = Set.new(["apple", "banana", "orange", "kiwi"]).
  2. Next, we call the delete_if method on the set and pass a block that checks if the length of each string is greater than 4.
  3. If the block returns true (i.e., the string length is greater than 4), the delete_if method removes that string from the set.
  4. We print the updated set to verify that strings longer than 4 characters have been removed.

Ruby Program

require 'set'

string_set = Set.new(["apple", "banana", "orange", "kiwi"])
puts "Original Set: #{string_set.to_a}"

string_set.delete_if { |str| str.length > 4 }

puts "Set after removing strings longer than 4 characters: #{string_set.to_a}"

Output

Original Set: ["apple", "banana", "orange", "kiwi"]
Set after removing strings longer than 4 characters: ["kiwi"]

Summary

In this tutorial, we learned How to Remove Items from Set based on a Condition in Ruby language with well detailed examples.


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