Asynchronicity in JavaScript
Understanding asynchronicity in JavaScript along with event loop and callback queue
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Background
JavaScript supports asynchronous programming. However, writing asynchronous programs is tricky if you don’t have knowledge of the blocking code and JavaScript. Let’s dive deeper into how asynchronicity is engineered in the language.
Callback functions
To leverage asynchronous functions in JavaScript, design callback functions. Callback functions are invoked as soon as the blocking function finishes. Let’s revisit an example.
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function complete(){console.log("function completed!");return;}setTimeout(complete, 2000.0); // 2000 = 2 seconds of idle time
Above, the complete function acts as the callback function for setTimeout function ...