How to check if a value exists in an Array in Ruby?

In this article, we will discuss how to check if a value exists in an array in ruby. We can check if a value exists in an array through different methods ranging from using Array#member? method and Array#include? method to Array#any? method

Check if a value exists in an array using Array#include?

The  Array#include? method returns true if the array contains the specified value, otherwise false.

Syntax:

array.include?(value)

Example: In this example, we use array.include? method in the array to check if the array contains the value 3.Since 3 is present in array puts statement outputs true and similarly do for other members present in the array

Ruby

# Define an array
array = [1, 2, 3, 4, 5]

# Check if array contains a value using include? method
puts array.include?(3)  # Output: true
puts array.include?(6)  # Output: false

Output

true
false

Check if a value exists in an array using Array#member?

The Array#member? method checks if the array contains the specified value and returns true if it does, otherwise false.

Syntax:

array.member?(value)

Example: In this example,we use member? method in the array to check if the array contains the value 3.Since 3 is present in array puts statement outputs true and similarly do for other members present in the array

Ruby

# Define an array
array = [1, 2, 3, 4, 5]

# Check if array contains a value using member? method
puts array.member?(3)  # Output: true
puts array.member?(6)  # Output: false

Output

true
false

Check if a value exists in an array using Array#any?

The Array#any? method checks if any element in the array satisfies the given condition (usually using a block) and returns true if at least one element satisfies the condition, otherwise false.

Syntax:

array.any? { |element| condition }

Example: In this example we use the any? method with a block to check if any element in the array equals 3.Since 3 is present in the array, the puts statement outputs true and similarly do for other members present in the array

Ruby

# Define an array
array = [1, 2, 3, 4, 5]

# Check if array contains a value using any? method
puts array.any? { |element| element == 3 }  # Output: true
puts array.any? { |element| element == 6 }  # Output: false

Output

true
false