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43 lines
1.5 KiB
Plaintext
43 lines
1.5 KiB
Plaintext
// Returns characters (as strings).
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IO.print("abcd"[0]) // expect: a
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IO.print("abcd"[1]) // expect: b
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IO.print("abcd"[2]) // expect: c
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IO.print("abcd"[3]) // expect: d
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// Allows indexing backwards from the end.
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IO.print("abcd"[-4]) // expect: a
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IO.print("abcd"[-3]) // expect: b
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IO.print("abcd"[-2]) // expect: c
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IO.print("abcd"[-1]) // expect: d
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// Regression: Make sure the string's internal buffer size is correct.
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IO.print("abcd"[1] == "b") // 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]) // expect: s
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IO.print("søméஃthîng"[1]) // expect: ø
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IO.print("søméஃthîng"[3]) // expect: m
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IO.print("søméஃthîng"[6]) // expect: ஃ
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IO.print("søméஃthîng"[10]) // expect: h
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IO.print("søméஃthîng"[-1]) // expect: g
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IO.print("søméஃthîng"[-2]) // expect: n
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IO.print("søméஃthîng"[-4]) // expect: î
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// If the subscript is in the middle of a UTF-8 sequence, yield an empty string.
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IO.print("søméஃthîng"[2] == "") // expect: true
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IO.print("søméஃthîng"[7] == "") // expect: true
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IO.print("søméஃthîng"[8] == "") // expect: true
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IO.print("søméஃ"[-1] == "") // expect: true
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IO.print("søméஃ"[-2] == "") // expect: true
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// 8-bit clean.
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IO.print("a\0b\0c"[0] == "a") // expect: true
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IO.print("a\0b\0c"[1] == "\0") // expect: true
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IO.print("a\0b\0c"[2] == "b") // expect: true
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IO.print("a\0b\0c"[3] == "\0") // expect: true
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IO.print("a\0b\0c"[4] == "c") // expect: true
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