Ruby's Defined Operator Quiz

The 'defined' operator in Ruby is used to determine whether a given expression is defined or not. It returns a description string of the expression if it is defined, or 'nil' if the expression isn't defined.

The expression 'defined.variable' returns 'true' if the variable is initialized, along with a description string of the variable type, such as 'local-variable' or 'global-variable'. If the variable is not defined, it returns 'nil'.

The 'defined' operator is used with the method name, such as 'defined.method_name', to check if a method is defined. It returns 'true' along with the description string 'method' if the method is defined, or 'nil' if the method is not defined.

<p>The 'defined.yield' operator in Ruby returns 'true' if a code block has been passed, along with the string 'yield'. If no block has been passed, it returns 'nil'.</p> Signup and view all the answers

<p>In Ruby, 'defined.super' returns 'super' if a method exists that can be called with 'super'. If the method cannot be called with 'super', it returns 'nil'.</p> Signup and view all the answers