Web Reference: Callbacks were the first JavaScript solution for handeling asynchronous results that could not be available immediately. This page explains what callbacks are and why they can cause some problems. Jul 3, 2025 · In this module, we take a look at asynchronous JavaScript, why it is important, and how it can be used to effectively handle potential blocking operations, such as fetching resources from a server. Before we hop into the real deal, let's look at these two words – synchronous and asynchronous. By default, JavaScript is a synchronous, single threaded programming language. This means that instructions can only run one after another, and not in parallel. Consider the little code snippet below: The above code is pretty simple – it sums two numbers...
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