Web Reference: So if you try to call a function expression before it's loaded, you'll get an error! If you call a function declaration instead, it'll always work, because no code can be called until all declarations are loaded. Jan 3, 2024 · Functions in JavaScript allow us to carry out some set of actions, important decisions, or calculations and even make our website more interactive. In this article, we will learn the difference between ‘function declaration’ and ‘function expression’. 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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