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

Declare constants with the let keyword and variables with the var keyword.

let maximumNumberOfLoginAttempts = 10 var currentLoginAttempt = 0   
let maximumNumberOfLoginAttempts = 10
var currentLoginAttempt = 0

Declare multiple constants or multiple variables on a single line, separated by commas:

var x = 0.0, y = 0.0, z = 0.0

Printing Constants and Variables

You can print the current value of a constant or variable with the println function:

println(friendlyWelcome)

Swift uses string interpolation to include the name of a constant or variable as a placeholder in a longer string

Wrap the name in parentheses and escape it with a backslash before the opening parenthesis:

println("The current value of friendlyWelcome is \(friendlyWelcome)")

Reference : http://iosswift.com.au/?p=17