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46 lines
2.1 KiB
TypeScript
46 lines
2.1 KiB
TypeScript
// toLowerCase()/toUpperCase() are STATIC now (no @dynamic): ECMA-262
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// Default Case Conversion via the vendored libunicode tables — the same
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// algorithm the engine used when these were island-backed, linked like a
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// regex literal. Node (ICU) is the oracle: simple mappings, 1:many
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// special casing, context-sensitive final sigma, astral case pairs, and
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// case-less scripts must all agree byte-for-byte.
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const s = " Hello, World ";
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console.log(s.toUpperCase() + "|", s.toLowerCase() + "|");
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// ASCII round trips.
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console.log("MIXED case Words".toLowerCase(), "mixed CASE words".toUpperCase());
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// 1:many special casing: ß upper-cases to SS (length grows).
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console.log("straße".toUpperCase(), "straße".toUpperCase().length);
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// İ (U+0130) lower-cases to i + combining dot above (two code points).
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const dottedI = "İstanbul".toLowerCase();
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console.log(dottedI, dottedI.length, dottedI.charCodeAt(0), dottedI.charCodeAt(1));
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// fi ligature upper-cases to FI.
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console.log("final".toUpperCase());
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// Context-sensitive Greek final sigma: word-final Σ becomes ς, medial σ.
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console.log("ΣΊΣΥΦΟΣ".toLowerCase());
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console.log("ΟΔΟΣ ΟΔΟΣ".toLowerCase());
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console.log("Σ".toLowerCase(), "ΑΣ".toLowerCase(), "Σ2".toLowerCase());
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// Astral case pairs (Deseret): supplementary-plane mappings.
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const deseret = "\u{10437}\u{10437}";
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const upper = deseret.toUpperCase();
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console.log(upper, upper.length, upper.charCodeAt(0));
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console.log("\u{1040F}".toLowerCase() === "\u{10437}");
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// Cyrillic, Greek, and accents.
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console.log("Привет МИР".toLowerCase(), "привет мир".toUpperCase());
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console.log("Café ÀÉÎÕÜ".toLowerCase(), "café àéîõü".toUpperCase());
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// Case-less content is untouched; empty string stays empty.
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console.log("日本語 123 —".toUpperCase(), "".toLowerCase() + "|");
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// Composes with the rest of the string surface, statically.
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const words = "alpha beta gamma";
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console.log(words.toUpperCase().indexOf("BETA"), words.slice(6, 10).toUpperCase());
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let label: string;
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if ((label = "Port").toLowerCase() === "port") {
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console.log("guard:", label);
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}
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