2faa81d41f
Add docstrings, usage examples, and doc tests for `String.prev`, `.front`, `.back`, `.atEnd`. Improve docstring examples for `String.next` based on discussion examples for `String.prev`. --------- Co-authored-by: Kim Morrison <kim@tqft.net>
17 lines
702 B
Text
17 lines
702 B
Text
/-!
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# Examples from documentation added in https://github.com/leanprover/lean4/pull/4166
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-/
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def abc : String := "abc"
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def lean : String := "L∃∀N"
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#guard abc.get (0 |> abc.next) = 'b'
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#guard lean.get (0 |> lean.next |> lean.next) = '∀'
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#guard abc.get (abc.endPos |> abc.prev) = 'c'
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#guard lean.get (lean.endPos |> lean.prev |> lean.prev |> lean.prev) = '∃'
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#guard "abc".front = 'a'
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#guard "".front = (default : Char)
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#guard "abc".back = 'c'
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#guard "".back = (default : Char)
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#guard (0 |> abc.next |> abc.next |> abc.atEnd) = false
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#guard (0 |> abc.next |> abc.next |> abc.next |> abc.next |> abc.atEnd) = true
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#guard (0 |> lean.next |> lean.next |> lean.next |> lean.next |> lean.atEnd) = true
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