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swiftnumber-formatting

Using Swift ".formatted()" for decimals with trailing zeros removed?

I am trying to remove trailing zeros from doubles, the code I've seen are similar to this.

let formatter = NumberFormatter()
formatter.minimumFractionDigits = 0
formatter.maximumFractionDigits = 2
print(formatter.string(from: 1.0000)!) // 1
print(formatter.string(from: 1.2345)!) // 1.23

Which requires you to create a NumberFormatter(). I know Apple introduced a new .formatted() function recently. Does anyone know if it's possible to do the above with this new system?

The documentation is a bit convoluted for me but so far I've only seen the ability to set the precision.

let string = 1.00000.formatted(.number.precision(.fractionLength(2)))
// 1.00
Solution

  • .precision is what you should use and then there is a variant of .fractionLength that takes a range as argument,

    10_000.123.formatted(.number.precision(.fractionLength(0…2)))