18 replies

javascript questions

Hey, i've just started properly diving into javascript and have a few questions.

1.) What are the less obvious differences between

let

let

let

let,

const

const

const

const and

var

var

var

var? I'm aware

let

let

let

let is used to declare generic variables and

const

const

const

const is used for constant variables that never change etc. however i've heard you shouldn't use

var

var

var

var but i've also heard it has it's uses in some situations?

2.) Why do functions such as

.length

.length

.length

.length not require double parenthesis after it, but functions such as

.toUpperCase()

.toUpperCase()

.toUpperCase()

.toUpperCase() do?

3.) What do

@param

@param

@param

@param's mean in comments? I've seen them in a few files.

I'd appreciate any help. Thank you in advance.