Web Reference: A JavaScript callback is a function passed as an argument to another function, which is then executed (or "called back") at a later point in time to complete a specific task. Master the basics of JavaScript Functions 🚂 in a fun tutorial packed full of 90's nostalgia. https://fireship.io/courses/javascript/beginner-js-functions/- ... Jul 8, 2025 · A function in JavaScript is similar to a procedure—a set of statements that performs a task or calculates a value, but for a procedure to qualify as a function, it should take some input and return an output where there is some obvious relationship between the input and the output.
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