forked from Mirror/wren
48 lines
1.6 KiB
Plaintext
48 lines
1.6 KiB
Plaintext
var string = "abcde"
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IO.print(string[0..0]) // expect: a
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IO.print(string[1...1] == "") // expect: true
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IO.print(string[1..2]) // expect: bc
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IO.print(string[1...2]) // expect: b
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IO.print(string[2..4]) // expect: cde
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IO.print(string[2...5]) // expect: cde
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// A backwards range reverses.
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IO.print(string[3..1]) // expect: dcb
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IO.print(string[3...1]) // expect: dc
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IO.print(string[3...3] == "") // expect: true
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// Negative ranges index from the end.
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IO.print(string[-5..-2]) // expect: abcd
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IO.print(string[-5...-2]) // expect: abc
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IO.print(string[-3..-5]) // expect: cba
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IO.print(string[-3...-6]) // expect: cba
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// Half-negative ranges are treated like the negative value is fixed before
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// walking the range.
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IO.print(string[-5..3]) // expect: abcd
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IO.print(string[-3...5]) // expect: cde
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IO.print(string[-2..1]) // expect: dcb
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IO.print(string[-2...0]) // expect: dcb
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IO.print(string[1..-2]) // expect: bcd
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IO.print(string[2...-1]) // expect: cd
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IO.print(string[4..-5]) // expect: edcba
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IO.print(string[3...-6]) // expect: dcba
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// An empty range at zero is allowed on an empty string.
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IO.print(""[0...0] == "") // expect: true
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IO.print(""[0..-1] == "") // expect: true
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// Indexes by byte, not code point.
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//
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// Bytes: 11111
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// 012345678901234
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// Chars: sø mé ஃ thî ng
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IO.print("søméஃthîng"[0..3]) // expect: søm
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IO.print("søméஃthîng"[3...10]) // expect: méஃt
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// Only includes sequences whose first byte is in the range.
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IO.print("søméஃthîng"[2..6]) // expect: méஃ
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IO.print("søméஃthîng"[2...6]) // expect: mé
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IO.print("søméஃthîng"[2...7]) // expect: méஃ
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