Explore the evolution of variable declaration in JavaScript with the 'var' and 'let' keywords. Understand the differences between these two declarations and their impact on variable scope and hoisting.

Rafal Nawojczyk

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JavaScript has two keywords for declaring non-constant variables: var and let. While let is recommended and provides block scoping, var exists for backward compatibility and is function-scoped. The variables declared with var are hoisted and can be re-declared, while let variables are not hoisted, cannot be re-declared, and have block scope.

JavaScript — The 'var' and 'let' keywords story in declaring a non-constant variables