Web Reference: Sep 24, 2025 · Hoisting is the process by which JavaScript moves all declarations (not assignments) to the top of the current scope during the compile phase. This means you can use variables and functions before you declare them, but with some important rules. Hoisting is JavaScript's default behavior of moving all declarations to the top of the current scope (to the top of the current script or the current function). Variables defined with let and const are hoisted to the top of the block, but not initialized. In this tutorial, you'll learn how about the JavaScript hoisting and how it works under the hood.
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