if-else

The if-else statement helps control the flow of your code.

A condition is placed between the parenthesis following 'if', when that condition evalues to truthy, the code between the following curly braces is run. Alternatively, when the condition evaluates to falsy, the code between the curly braces of 'else' block is run instead. Writing an else block is optional.

From the MDN entry: The 'if' statement executes a statement if a specified condition is truthy. If the condition is falsy, another statement can be executed