How to use unless statement In Ruby
The unless statement is the opposite of the if statement. It executes a block of code if the condition evaluates to false or nil.
Syntax:
unless variable
# Code to execute if variable is nil
end
Example:
Below is the Ruby program to check if a variable is nil using unless statement:
# Ruby program to check if a variable
# is nil using unless statement
# Example variable
variable = nil
unless variable
puts "Variable is nil"
else
puts "Variable is not nil"
end
Output
Variable is nil
Explanation:
In this example we use unless statement to execute a block of code if variable evaluates to false or nil. If variable is nil, it prints “Variable is nil”, otherwise “Variable is not nil”.
How to check if a variable is nil in Ruby?
In Ruby, nil is used to indicate that a variable has not been assigned a value or that a method call returned nothing. This article focuses on discussing how to check if a variable is nil in Ruby.
Table of Content
- Using nil? method
- Using == operator
- Using unless statement
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