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30 lines
1.0 KiB
Swift
30 lines
1.0 KiB
Swift
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import Foundation
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extension Int {
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func formattedAsAbbreviation() -> String {
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typealias Abbrevation = (threshold: Double, divisor: Double, suffix: String)
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let abbreviations: [Abbrevation] = [
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(0, 1, ""), (1000.0, 1000.0, "K"),
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(999_999.0, 1_000_000.0, "M"), (999_999_999.0, 1_000_000_000.0, "B")
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]
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let startValue = Double(abs(self))
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guard let nextAbbreviationIndex = abbreviations.firstIndex(where: { startValue < $0.threshold }) else {
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return String(self)
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}
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let abbreviation = abbreviations[abbreviations.index(before: nextAbbreviationIndex)]
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let formatter = NumberFormatter()
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formatter.positiveSuffix = abbreviation.suffix
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formatter.negativeSuffix = abbreviation.suffix
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formatter.allowsFloats = true
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formatter.minimumIntegerDigits = 1
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formatter.minimumFractionDigits = 0
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formatter.maximumFractionDigits = 1
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return formatter.string(from: NSNumber(value: Double(self) / abbreviation.divisor))!
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}
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}
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