History variables: Difference between revisions
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m →version 1: removed the "style" from the PRE html tag. |
add swift |
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x history. |
x history. |
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</lang> |
</lang> |
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=={{header|Swift}}== |
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Swift does not support history variables. However, you can add a watcher that can track when the variable will change. |
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<lang Swift>var historyOfHistory = [Int]() |
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var history:Int = 0 { |
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willSet { |
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historyOfHistory.append(history) |
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} |
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} |
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history = 2 |
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history = 3 |
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history = 4 |
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println(historyOfHistory)</lang> |
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=={{header|Tcl}}== |
=={{header|Tcl}}== |
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