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14 lines
473 B
JavaScript
14 lines
473 B
JavaScript
const values = new Array(4).fill(0);
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let reads = 0;
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function index() { reads++; return 1; }
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const sum = values[index()] += 7;
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const shifted = values[1] <<= 2;
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const text = values[2] += "x";
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console.log(JSON.stringify(values), sum, shifted, text, reads);
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const object = { value: 2 };
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let order = "";
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const key = { toString() { order += "k"; return "value"; } };
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const result = object[key] += (() => { order += "r"; return 3; })();
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console.log(result, object.value, order);
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