Web Reference: Jan 3, 2024 · In this article, we will learn the difference between ‘function declaration’ and ‘function expression’. The similarity is both use the keyword function and the most prominent difference is that the function declaration has a function name while the latter doesn't have one. Jul 8, 2025 · A function expression is very similar to, and has almost the same syntax as, a function declaration. The main difference between a function expression and a function declaration is the function name, which can be omitted in function expressions to create anonymous functions. Apr 19, 2019 · In short, use function declarations when you want to create a function on the global scope and make it available throughout your code. Use function expressions to limit where the function is available, keep your global scope light, and maintain clean syntax.
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