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19 lines
496 B
JavaScript
19 lines
496 B
JavaScript
console.log([0].includes(), [undefined].includes(), [null].includes(), [].includes());
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console.log([undefined, 0, undefined].includes());
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const holes = [2];
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holes[2] = 2;
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console.log(holes.includes());
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const untyped = [];
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untyped[2] = 2;
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console.log(untyped.includes());
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const present = [undefined, 1];
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present[3] = undefined;
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console.log(present.includes());
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let evaluations = 0;
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function receiver() { evaluations++; return [undefined, 1]; }
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console.log(receiver().includes(), evaluations);
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