Web Reference: 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. Learn how the JavaScript engine moves the variable and function declarations to the top of the script during the creation phase of the execution context. See the difference between hoisting and initialization, and the effects of var, let, function expressions and arrow functions. Jul 11, 2025 · JavaScript Hoisting refers to the process whereby the interpreter appears to move the declaration of functions, variables, classes, or imports to the top of their scope, prior to execution of the code.
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