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History variables: Difference between revisions
add swift
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x history.
</lang>
=={{header|Swift}}==
Swift does not support history variables. However, you can add a watcher that can track when the variable will change.
<lang Swift>var historyOfHistory = [Int]()
var history:Int = 0 {
willSet {
historyOfHistory.append(history)
}
}
history = 2
history = 3
history = 4
println(historyOfHistory)</lang>
=={{header|Tcl}}==
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