Web Reference: Apr 18, 2009 · var variables are global and can be accessed basically everywhere, while let variables are not global and only exist until a closing parenthesis kills them. See my example below, and note how the lion (let) variable acts differently in the two console.logs; it becomes out of scope in the 2nd console.log. Jan 16, 2026 · JavaScript provides three ways to declare variables: var, let, and const, but they differ in scope, hoisting behaviour, and re-assignment rules. var: Declares variables with function or global scope and allows re-declaration and updates within the same scope. Apr 2, 2020 · In this article, we'll discuss var, let and const with respect to their scope, use, and hoisting. As you read, take note of the differences between them that I'll point out. Before the advent of ES6, var declarations ruled. There are issues associated with variables declared with var, though.
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