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14 lines
614 B
JavaScript
14 lines
614 B
JavaScript
console.log(["true"].indexOf(true), ["0"].includes(0));
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console.log([false].indexOf(0), [false].includes("false", 0));
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console.log([undefined].indexOf(0), [null].includes(undefined));
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console.log([[]].indexOf(0), [[1]].includes("1"));
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console.log([1n].indexOf(1), [1].includes(1n));
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console.log(["true", "other"].indexOf(true, 1));
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let effects = 0;
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function needle() { effects++; return true; }
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function start() { effects++; return 0; }
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console.log(["true"].indexOf(needle(), start()), effects);
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const sparse = ["one"];
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sparse[3] = "four";
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console.log(sparse.includes(undefined, 1), sparse.indexOf(undefined, 1));
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