PRDV401: Introduction to JavaScript I

if (condition)
  statement1

// With an else clause
if (condition)
  statement1
else
  statement2

condition
An expression that is considered to be either truthy or falsy.

statement1
Statement that is executed if condition is truthy. Can be any statement, including further nested if statements. To execute multiple statements, use a block statement ({ /* ... */ }) to group those statements. To execute no statements, use an empty statement.

statement2
Statement that is executed if condition is falsy and the else clause exists. Can be any statement, including block statements and further nested if statements.