This content originally appeared on DEV Community and was authored by Tammy Vo
100 days of Swift - Day 1 - Simple Types
Variables:
To create a new variable we need to use "var" to initialize and define.
var operatingSystem = "macOS"
Strings and Integers:
Swift is type safe.
Strings and Integers can not be mixed.
If there are larger numbers, we can use underscores as thousand separators making it easier to read.
var str = "Hello"
var age = 25
var population = 8_000_000
Multi-line String:
Start and end with three double quote marks for multi-line strings, this will include line breaks.
var str1 = """
This goes
over multiple
lines
"""
// This way will not show new line breaks in output
var str2 = """
This goes \
over multiple \
lines
"""
Doubles and booleans:
Doubles will hold a decimal value:
var pi = 3.141
Booleans will hold a true or false value:
var isCool = true
String interpolation:
Place any type of variable inside your string by adding a backslash \
var score = 85
var str = "Your score was \(score)"
var results = "The test results are here: \(str)"
Constants
Use the let keyword to create constants. Constants can be set once and never changed.
let taylor = "swift"
Type annotations
Swift assigns each variable and constant a type based on what value it’s given when it’s created.
To be explicit about the data type, we can assign it:
let album: String = "Reputation"
let year: Int = 1989
let height: Double = 1.78
let taylorRocks: Bool = true
This content originally appeared on DEV Community and was authored by Tammy Vo
Tammy Vo | Sciencx (2022-07-23T16:08:00+00:00) 100 days of Swift – Day 1. Retrieved from https://www.scien.cx/2022/07/23/100-days-of-swift-day-1/
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