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Programming language: Swift
License: MIT License
Tags: Utility    

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README

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](Sources/Percentage/Percentage.swift) 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, and supports all the arithmetic operators.

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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