Web Reference: Variables defined with let and const are hoisted to the top of the block, but not initialized. Meaning: The block of code is aware of the variable, but it cannot be used until it has been declared. Let's start with variables hoisting, when you declare a variable using the var keyword, JavaScript hoists the declaration to the top of its scope. However it's crucial to note that only the declaration is hoisted, not the initialization. Jan 15, 2026 · When you use var to declare a variable, the declaration is hoisted to the top, but its value is not assigned until the code execution reaches the variable’s initialization.
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