Expressions and Operators Reference

Primary expressions

Basic keywords and general expressions in JavaScript.  Please select a keyword to learn about the syntax and run an example.

this

The this keyword refers to a special property of an execution context.

function

The function keyword defines a function expression.

class

The class keyword defines a class expression.

function*

The function*keyword defines a generator function expression.

yield

Pause and resume a generator function.

yield*

Delegate to another generator function or iterable object.

async function

The async function defines an async function expression.

await

Pause and resume an async function and wait for the promise's resolution/rejection.

[]

Array initializer/literal syntax.

{}

Object initializer/literal syntax.

/ab+c/i

Regular expression literal syntax.

( )

Grouping operator.