yattee/Extensions/Int+Format.swift

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Swift
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import Foundation
extension Int {
func formattedAsAbbreviation() -> String {
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let num = fabs(Double(self))
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guard num >= 1000.0 else {
return String(self)
}
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let exp = Int(log10(num) / 3.0)
let units = ["K", "M", "B", "T", "X"]
let unit = units[exp - 1]
let formatter = NumberFormatter()
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formatter.positiveSuffix = unit
formatter.negativeSuffix = unit
formatter.allowsFloats = true
formatter.minimumIntegerDigits = 1
formatter.minimumFractionDigits = 0
formatter.maximumFractionDigits = 1
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let roundedNum = round(10 * num / pow(1000.0, Double(exp))) / 10
return formatter.string(from: NSNumber(value: roundedNum))!
}
}