CODEWITHSUNDEEP
javascriptpromisejquery-deferredes6-promisewhen-js
MaatDeamon
MaatDeamon

Reputation: 9761

Is there a way to go from Jquery Deferred/Promise to When-JS Promise

I would like to use When-JS capability out of the promise returned by a jquery ajax call. Is there a conversion scheme ?

Edit 1

https://github.com/cujojs/when/blob/master/docs/api.md#api

Upvotes: 1

Views: 105

Answers (1)

Benjamin Gruenbaum
Benjamin Gruenbaum

Reputation: 276296

Yes, Promises/A+ promises like When promises have this functionality by-design and they are built to assimilate jQuery thenables.

In order to convert any foreign thenable (like a jQuery promise) to a when promise, just wrap it in when:

when($.get(...)).then(...

when(x) - get a trusted promise for x. If x is a foreign thenable, a returns a promise that follows x.

How thenables are assimilated is well specified in the Promises/A+ spec:

The promise resolution procedure is an abstract operation taking as input a promise and a value, which we denote as [[Resolve]](promise, x). If x is a thenable, it attempts to make promise adopt the state of x, under the assumption that x behaves at least somewhat like a promise. Otherwise, it fulfills promise with the value x.

Upvotes: 3

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