Key Term: ! (NOT) operator

Definition

Definition: The ! (NOT) operator is a unary operator that negates the value of a boolean expression. It returns true if the expression is false, and false if the expression is true.

Analogy

Analogy: Think of the ! (NOT) operator as a "flip switch" for boolean values. Just like flipping a light switch changes the state of the light from on to off or vice versa, using the ! (NOT) operator flips the value of a boolean expression.

Related terms

&& (AND) operator: The && (AND) operator combines two boolean expressions and returns true only if both expressions are true.

|| (OR) operator: The || (OR) operator combines two boolean expressions and returns true if at least one of the expressions is true.

Boolean expression: A boolean expression is an expression that evaluates to either true or false.