Web Reference: Jul 11, 2025 · With the introduction of ES6 in 2015 two more keywords, let and const came into the picture. var and let are both used for variable declaration in javascript but the difference between them is that var is function scoped and let is block scoped. Apr 18, 2009 · ECMAScript 6 introduced the let declaration keyword. I've heard that it's described as a local variable, but I'm still not quite sure how it behaves differently than the var keyword. The const keyword allows you to declare a constant (a JavaScript variable with a constant value). Constants are similar to let variables, except that the value cannot be changed.
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