Swift - Introduction Variables

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Introduction

You define a variable in Swift using either the let or the var keyword.

In our playground there is already one variable defined: 

var str = "Hello, playground"

A new variable called str with the string value "Hello, playground".

We can create new variables and constant variables of different types: 

var myVariable = 123 
let myConstantVariable = 123

var keyword defines a variable.

let keyword defines a constant.

Swift is a statically typed language.

Once a variable has a type, it cannot be changed.

We've been letting the compiler work out what it should be.

This means our variables have been implicitly typed.

Related Topics

Exercise