ExecutableStatement ::= FunctionStatement – (TextLabel | CaseLabel | DefaultLabel)
IfStatement ::= ‘if’ S? ConditionalExpression S? (ExecutableStatement | BracedStatements) S? (‘else’ S (ExecutableStatement | BracedStatements))?

The “if” and “else” statements indicate conditional statement execution.  The first (or only) statement or statement block is executed only if the conditional expression is true; the statement or statement block after the “else” is executed, if it exists, only if the conditional expression is false.

  See also:  [Evaluation and null statements] [The "goto" statement and text labels] [The "return" statement] [The "if" and "else" statements]
[The "for" statement] [The "while" statement] [The "do" statement] [The "switch," "case," and "default" statements]
[The "break" statement] [The "continue" statement] [Opcode and mod byte escape sequences]