What is the difference between `let` and `var` in swift?

Question

What is the difference between let and var in Apple\'s Swift language?

In my understanding, it is a compiled language but it does not check

Answer 1

The keyword var is used to define a variable whose value you can easily change like this:

var no1 = 1 // declaring the variable 
no1 = 2 // changing the value since it is defined as a variable not a constant

However, the let keyword is only to create a constant used when you do not want to change the value of the constant again. If you were to try changing the value of the constant, you will get an error:

let no2 = 5 // declaring no2 as a constant
no2 = 8 // this will give an error as you cannot change the value of a constant