What is the difference between Let and Var

9y1.3kWeb Development

both let and var used to declare variable then what is the difference between Let and Var.

when to use Let. plzz explain with a example the main usage of Let keyword. thanks

5 Replies

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Gokhul Varman9y ago
It is very simple difference for more explanation refer the link given below:https://www.devbattles.com/en/sand/post-658-The+difference+between+let+and+var+in+JavaScript
Rajkiran Swain9y ago
Let :
let keyword in swift is used to declare constant value and immutable can never be changed once defined.

let name ="Kirit"

after you can change name = "Modi" then you got compiler error. So declare value of its only one time using let keyword.

Var :
var keyword is mutable in swift is used to declare variant value, That value can change at run time. it means can change it too many time.

var name = "Kirit"

You can changed name = "Modi" then successfully updated value of variable.
Vivek Kumar9y ago
Please go through the below link. It explained very well with demo examples.

https://stackoverflow.com/questions/762011/whats-the-difference-between-using-let-and-var-to-declare-a-variable
Ketan Mokariya9y ago
Here is the good answer.

https://stackoverflow.com/questions/762011/whats-the-difference-between-using-let-and-var-to-declare-a-variable

Sundaram Subramanian9y ago

The let keyword defines a constant:

let theAnswer = 42

The theAnswer cannot be changed afterwards. This is why anything weak can't be written using let. They need to change during runtime and you must be using var instead.

The var defines an ordinary variable.