Percentage

A percentage type for Swift

Makes percentages more readable and type-safe, for example, for APIs that currently accept a fraction

Double

-.opacity(0.45)
+.opacity(45%)

Install

Add the following to

Package.swift

.package(url: "https://github.com/sindresorhus/Percentage", from: "1.1.0")

Or add the package in Xcode.

Usage

See the source for docs.

import Percentage

10% + 5.5%
//=> 15.5%
-10% / 2
//=> -5%
(40% + 93%) * 3
//=> 399%
50% * 50%
//=> 25%
30% > 25%
//=> true
50%.of(200)
//=> 100
Percentage(50)
//=> 50%
Percentage(fraction: 0.5)
//=> 50%
50%.fraction
//=> 0.5
10%.rawValue
//=> 10
print("(1%)")
//=> "1%"
Percent.random(in: 10%...20%)
//=> "14.3%"

The type conforms to

Hashable

Codable

RawRepresentable

Comparable

ExpressibleByFloatLiteral

ExpressibleByIntegerLiteral

Numeric

Codable

The percentage value is encoded as a single value:

struct Foo: Codable {
    let alpha: Percentage
}

let foo = Foo(alpha: 1%)
let data = try! JSONEncoder().encode(foo)
let string = String(data: data, encoding: .utf8)!
print(string)
//=> "{"alpha":1}"

FAQ

Can you support Carthage and CocoaPods?

No, but you can still use Swift Package Manager for this package even though you mainly use Carthage or CocoaPods.

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