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 15, 2026 · Hoisting applies to variable and function declarations. Initializations are not hoisted; they are only declarations. 'var' variables are hoisted with undefined, while 'let' and 'const' are hoisted but remain in the Temporal Dead Zone until initialized. Aug 31, 2021 · Result: a is i10 and b is undefined Hence, this is because only hoisting of the declaration (var b) takes place, not the initialization (= “Lamborgini”) to the top. Because of hoisting, b has been declared before it is used, but because initializations are not hoisted, the value of b is undefined. Hoisting classes JavaScript classes can be classified into two classes: *Class declarations ...
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Last Updated: April 3, 2026
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