1

Does Swift have an equivalent of the C, and C++, function sprint() which directs its output to a string variable instead of the terminal?

2

You can use string interpolation for this: Documentation

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3

You can use the to: parameter on print:

var s = ""
print("foo", to: &s)
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4

And if you want the exact replacement to sprintf, here comes String.init(format:_:):

import Foundation

let str = String(format: "%u, %f\n", 1_000_000, 3.1415) // "1000000, 3.141500\n"
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5

Though caution: never use String.init(format:_:) for formatting values for users. Any one hard-coded format for numbers, currencies, dates, etc. is going to be wrong for the majority of people in the world.

Use NumberFormatter, DateFormatter, etc. for those.

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6

Should use the new Foundation FormatStyle: FormatStyle | Apple Developer Documentation

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