Upskilling Exams

var is the old JavaScript keyword, function-scoped, and allows redeclaration and updating of values.

var is hoisted and can create bugs, so it is not recommended in modern JavaScript.

let is block-scoped, cannot be redeclared in the same block, and is used for variables whose values may change.

let is safer than var because it respects block scope and avoids accidental redeclarations.

const is block-scoped like let but its value cannot be changed or redeclared after assignment.

Use const for fixed values and let for changeable values; avoid var in modern code.