Function Hoisting
Function hoisting is a JavaScript behavior where function declarations are moved to the top of their containing scope during the compilation phase, allowing them to be called before they appear in the code. This differs from variable hoisting, where only the declaration (not the initialization) is hoisted. It's a key aspect of JavaScript's execution context and can lead to unexpected behavior if not understood properly.
Developers should learn function hoisting to write predictable JavaScript code and debug issues related to scope and execution order. It's essential when working with legacy codebases or when mixing function declarations and expressions, as it affects how functions are accessible in different parts of the code. Understanding hoisting helps avoid errors like calling functions before they're defined in expressions or arrow functions.