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. Jan 24, 2026 · Hoisting is one of the most misunderstood concepts in JavaScript. Learn exactly how variables and functions are moved behind the scenes and avoid the sneaky bugs it can cause. During the creation phase, the JavaScript engine moves the variable and function declarations to the top of your code. This is known as hoisting in JavaScript. Variable hoisting means the JavaScript engine moves the variable declarations to the top of the script.
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