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Chris Tate
9282ed542a
* Implement static array lastIndexOf search * Coerce dynamic string-search needles before positions * Handle optional string-search needles with positions
21 lines
1.0 KiB
JavaScript
21 lines
1.0 KiB
JavaScript
let trace = "";
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function receiver() { trace += "r"; return [0, 1, 0]; }
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function needle() { trace += "n"; return 0; }
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function position() { trace += "p"; return "1.9"; }
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console.log(receiver().lastIndexOf(needle(), position()), trace);
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trace = "";
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console.log(receiver().lastIndexOf(needle(), void position()), trace);
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const numbers = [0, 1, 0, 1, 0];
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/** @type {(number | string | boolean | null | undefined)[]} */
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const positions = [undefined, null, false, true, "", "2.9", "bad", NaN, -Infinity, -3, -1, -0, 0, 1, 2, 4, Infinity, 99];
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for (const value of positions) {
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console.log(numbers.lastIndexOf(0, value), numbers.lastIndexOf(1, value));
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}
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console.log(numbers.lastIndexOf(0), numbers.lastIndexOf(0, undefined));
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console.log([NaN, 0, -0, NaN].lastIndexOf(NaN), [NaN, 0, -0].lastIndexOf(0));
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console.log([undefined].lastIndexOf(undefined), [null, undefined].lastIndexOf(null));
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const sparse = [1, , undefined, 1];
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console.log(sparse.lastIndexOf(undefined), sparse.lastIndexOf(undefined, 1), sparse.lastIndexOf(1, 2));
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