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    Promise.prototype

    The Promise.prototype property represents the prototype for the Promise constructor.

    Property attributes of Promise.prototype
    Writable no
    Enumerable no
    Configurable no

    Description

    Promise instances inherit from Promise.prototype. You can use the constructor's prototype object to add properties or methods to all Promise instances.

    Properties

    Promise.prototype.constructor
    Returns the function that created an instance's prototype. This is the Promise function by default.

    Methods

    Promise.prototype.catch(onRejected)
    Appends a rejection handler callback to the promise, and returns a new promise resolving to the return value of the callback if it is called, or to its original fulfillment value if the promise is instead fulfilled.
    Promise.prototype.then(onFulfilled, onRejected)
    Appends fulfillment and rejection handlers to the promise, and returns a new promise resolving to the return value of the called handler, or to its original settled value if the promise was not handled (i.e. if the relevant handler onFulfilled or onRejected is undefined).

    Specifications

    Specification Status Comment
    ECMAScript 2015 (6th Edition, ECMA-262)
    The definition of 'Promise.prototype' in that specification.    		 Standard Initial definition.
    ECMAScript 2017 Draft (ECMA-262)
    The definition of 'Promise.prototype' in that specification.    		 Draft  

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
    Basic support 32 29.0 (29.0) No support 19 7.1
    Feature Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile Chrome for Android
    Basic support No support 29.0 (29.0) No support No support 8 32

    See also

    Document Tags and Contributors

    Tags: 
     Contributors to this page: fscholz, bitzstein, realityking
     Last updated by: fscholz,