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

let is a constant value, so it can never be changed.

let number = 5  
number = 6               //This will not compile.

Var is a variable, and can change (but after it is defined not to a different data type.)

var number = 5
number = 6               //This will compile.

If you try changing the variable to a different dataType, it will not work

var number = 5
number = "Hello World"   //This will not compile.