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LibJS: Implement a naive String.prototype.localeCompare
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test("basic functionality", () => {
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expect(String.prototype.localeCompare).toHaveLength(1);
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expect("".localeCompare("")).toBe(0);
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expect("a".localeCompare("a")).toBe(0);
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expect("6".localeCompare("6")).toBe(0);
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function compareBoth(a, b) {
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const aTob = a.localeCompare(b);
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const bToa = b.localeCompare(a);
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expect(aTob).toBe(1);
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expect(aTob).toBe(-bToa);
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}
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compareBoth("a", "");
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compareBoth("1", "");
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compareBoth("a", "A");
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compareBoth("7", "3");
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compareBoth("0000", "0");
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expect("undefined".localeCompare()).toBe(0);
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expect("undefined".localeCompare(undefined)).toBe(0);
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expect("null".localeCompare(null)).toBe(0);
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expect("null".localeCompare(undefined)).not.toBe(0);
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expect("null".localeCompare()).toBe(-1);
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expect(() => {
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String.prototype.localeCompare.call(undefined, undefined);
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}).toThrowWithMessage(TypeError, "undefined cannot be converted to an object");
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});
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test("UTF-16", () => {
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var s = "😀😀";
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expect(s.localeCompare("😀😀")).toBe(0);
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expect(s.localeCompare("\ud83d")).toBe(1);
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expect(s.localeCompare("😀😀s")).toBe(-1);
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});
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