Basic operations

Like all other programming languages, Ruby comes packed with a whole bunch of operators.

Arithmetic operators

Assume a = 2 and b = 4.

Comparison operators

Assignment operators

Bitwise operators

Logical operators

Ruby range operators

The Ruby defined? operator

The defined? operator is an operator that checks whether the passed expression is defined or not. If the expression is not defined, it returns nil or else a description of the expression as a string:

• The defined? variable: If the variable is defined, it returns true
• The defined? method: If the method is defined, it returns true
• The defined? super: If the method exists that can be called with superuser, it returns true
• The defined? yield: If the code block has been passed, it returns true