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dojo/when.js
Maintainability
62.52
Lines of code
55
Difficulty
20.88
Estimated Errors
0.19
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define([ "./Deferred", "./promise/Promise" ], function(Deferred, Promise){ "use strict"; // module: // dojo/when return function when(valueOrPromise, callback, errback, progback){ // summary: // Transparently applies callbacks to values and/or promises. // description: // Accepts promises but also transparently handles non-promises. If no // callbacks are provided returns a promise, regardless of the initial // value. Foreign promises are converted. // // If callbacks are provided and the initial value is not a promise, // the callback is executed immediately with no error handling. Returns // a promise if the initial value is a promise, or the result of the // callback otherwise. // valueOrPromise: // Either a regular value or an object with a `then()` method that // follows the Promises/A specification. // callback: Function? // Callback to be invoked when the promise is resolved, or a non-promise // is received. // errback: Function? // Callback to be invoked when the promise is rejected. // progback: Function? // Callback to be invoked when the promise emits a progress update. // returns: dojo/promise/Promise // Promise, or if a callback is provided, the result of the callback. var receivedPromise = valueOrPromise && typeof valueOrPromise.then === "function"; var nativePromise = receivedPromise && valueOrPromise instanceof Promise; if(!receivedPromise){ if(arguments.length > 1){ return callback ? callback(valueOrPromise) : valueOrPromise; }else{ return new Deferred().resolve(valueOrPromise); } }else if(!nativePromise){ var deferred = new Deferred(valueOrPromise.cancel); valueOrPromise.then(deferred.resolve, deferred.reject, deferred.progress); valueOrPromise = deferred.promise; } if(callback || errback || progback){ return valueOrPromise.then(callback, errback, progback); } return valueOrPromise; }; });