How to check if a variable is defined in Ruby
In this post we will give you information about How to check if a variable is defined in Ruby. Hear we will give you detail about How to check if a variable is defined in RubyAnd how to use it also give you demo for it if it is necessary.
we are going to learn about how to check if a given variable is defined or not in Ruby.
Using defined? keyword
In ruby, we can use the built-in defined? keyword to check if a variable is defined or not.
The defined? keyword returns the information about the expression if a variable is defined in the current scope; otherwise, it returns nil.
Here is an example:
year = 2021puts defined? year
Output:
"local-variable"
second example:
puts defined? day
Output:
nil
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