Generate a Promise instance tailored to the specific platform in use

While working with Apache Cordova, I encountered a cross-platform challenge related to the Promise object.

At present, I am initializing a promise in the following manner:

var promise = new Promise(...) {
    //Implementation
}

Although this method works fine for most platforms, if the application is operating on Windows, I need to utilize WinJS instead. This requires me to adjust the code like so:

var promise = new WinJS.Promise(...) {
    //Implementation
}

This leads to having redundant code blocks as shown below:

var promise;

if (cordova.platformId == "windows") {
    promise = new WinJS.Promise(...) {
        //Implementation
    }
} 
else {
    promise = new Promise(...) {
        //Same implementation as above
    }
}

The primary issue lies in the fact that I am essentially duplicating the implementation within each promise declaration, resulting in identical code segments. This duplication makes it challenging to maintain the code.

Is there a way to instantiate the appropriate Promise based on the current platform without the need for repeated code segments?

Answer №1

In case the Promise object does not exist, a simple solution would be to assign it to WinJS.Promise and then proceed with using Promise in your code as usual.

For example:

if (typeof Promise === 'undefined' && cordova.platformId === 'windows') {
  Promise = WinJS.Promise; // assigning globally
}

// Following this, you can use new Promise() just like before

Answer №2

When diving into JS/Angular development, why not take advantage of the power of Angular Promise?

Take a look at $q, which is an excellent implementation of promises/deferred objects.

Check out the documentation for $q for more information.

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