Swift Note 1 - The Basics

The Basics

print("Hello, world!")

Constants and Variables

Constatnts and variables must be declared before they are used

let myConstant = 42
var myVariable = 42

Constants need to be assigned a value instantly at creation. You can declare multiple constants or variables on a single line

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

Naming

Names can contain Unicode characters.

If you have to use a reserved keyword as a name, wrap it with backticks

let `if` = 4
print(`if`)

Name a variable _ if you want to ignore it.

Comments

Comments in Swift is the same as C, except that multiline comments can be nested

/*
...
/*
 * multilines comment
 */
...
*/

Semicolons

Semicolons are required to separate multiple statements on a single line

let cat = "
                
                                 
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