mehdi-farsi/avoid_short_circuit_evaluation.md

By default, the || and && operators use the Short-circuit evaluation principle

irb> true || puts('short-circuit evaluation')
 => true 
irb> false && puts('short-circuit evaluation')
=> false

For both statements the left side of the expression suffices to determine the value of the expression. So, the puts('short-circuit evaluation') is never evaluated.

Sometimes, you need to evaluate the whole expression. To do so, you can use the | and & operators. They are both methods of the TrueClass and FalseClass classes

irb> false & puts('avoid short-circuit evaluation')
avoid short-circuit evaluation
 => false
irb> true | puts('avoid short-circuit evaluation')
avoid short-circuit evaluation
 => true