Promise

A {{jsxref("Promise")}} is an {{Glossary("object")}} that's returned by a {{Glossary("function")}} that has not yet completed its work. The promise literally represents a promise made by the function that it will eventually return a result through the promise object.

When the called function finishes its work {{Glossary("asynchronous", "asynchronously")}}, a function on the promise object called a resolution (or fulfillment, or completion) handler is called to let the original caller know that the task is complete.

See also

• Futures and promises
• {{jsxref("Promise")}} in the JavaScript Reference.
• Using promises