Web Reference: Apr 18, 2009 · The difference between let and const is that const variables need to be declared using an initializer, or it will generate an error. And, finally, when it comes to the Execution Context, variables defined with var will be attached to the 'this' object. Understanding the Difference Between let, const, and var in JavaScript (With Practical Examples) If you’ve written JavaScript, you’ve used variables. But one thing that often confuses ... 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.
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