How Can You Avoid Using jQuery Promises When Chaining Asynchronous jQuery Functions?

Avoiding jQuery Promises in Chained Asynchronous Operations

It's recommended to minimize the use of jQuery promises when utilizing ECMAScript promises. However, chaining two asynchronous jQuery functions becomes challenging without using jQuery's then or .when.

Avoiding jQuery Promises

While using Promise.resolve($.getJSON(url, params)) can conceal jQuery promises, it's ineffective in chained operations. To avoid jQuery promises in such scenarios, it's essential to identify and explicitly cast all jQuery promises on which you directly invoke methods.

Interoperability of JavaScript Promises

JavaScript promises are interoperable, meaning you can mix and match them from different implementations. However, to ensure specific implementations are used, you must explicitly cast jQuery promises.

Example

Consider the following code that chains two getJSON calls using native promises:

Promise.resolve($.getJSON("url1", params))
    .then(function(data) {
        return $.getJSON("url2", params);
    })
    .then(function(data) {
        // Process data
    });

In this example, $.getJSON returns jQuery promises. To avoid using jQuery's then method, we explicitly cast the jQuery promise to a native promise using Promise.resolve. Subsequently, we can continue chaining using native promise methods, ensuring that all .then method calls use the native implementation.

Conclusion

By explicitly casting jQuery promises, you can seamlessly integrate them into operations that use native ECMAScript promises, allowing you to avoid jQuery promises while maintaining the ability to chain asynchronous operations.

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