Web Reference: Mar 15, 2026 · Confused between function declarations and function expressions in JavaScript? This guide breaks down the differences, hoisting behavior, and when to use each — with clear code examples. Function expressions load only when the interpreter reaches that line of code. 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. Example: 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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