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.

In JavaScript, you will often hear the terms function and method, and although they look similar, they are not the same. A function is an independent block of code that performs a specific task. A method is a function that belongs to an object. When a function is defined inside an object and accessed using the dot (.) notation, it becomes a method.