Functions

function f(): void {
}

function fWithRequiredParameter(a: Number): void {
}

function fWithOptionalParameter(a: Number = 10): void {
}

function fWithRestParameter(...a: [Number]): void {
}

function fWithExpressionBody(): String (
	'violetscript'
);

// native function
native function fNative(): void;

Generators

A function is a generator if it uses the yield operator.

Remarks:

• Generator functions return a Generator object, which is an iterator.
• A generator function finishes returning undefined.

function f(): Iterator.<Number> {
	yield 10;
}

const iterator = f(); // Iterator.<Number>
iterator .next(); // {done: false, value: 10}
iterator .next(); // {done: true, value: undefined}

Asynchronous Functions

A function is asynchronous if it uses the await operator.

Remarks:

• Asynchronous functions return Promise.
• Any thrown errors will reject the Promise.

function f(): Number {
	await a();
	return 10;
}

Generic Functions

function genericFunction.<T>(): void {
}