/advanced-javascript-fundamentals

Primary LanguageJavaScript

Advanced Javascript fundamentals

Primitive types

Primitive types cannot be mutated as the types are passed by values Objects can be mutated as they are passed by reference

Prototype and __ proto__ property

whenever a Object is created, Javascript creates it with the dunder __ proto__ property whenever a function is created, JS creates it with .protoype property

Difference: dunder __ proto__ is used in prototypal chain lookup but not .prototype property

var, let, const

Scope

var = function execution scope

let/const = block scope

Hoisting

var = hoisted to the top of the execution context

let/const - not hoisted

Redeclaration

var = No error

let/const error