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-0 is not normalized #9

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acutmore opened this issue Apr 3, 2024 · 0 comments
Open

-0 is not normalized #9

acutmore opened this issue Apr 3, 2024 · 0 comments

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@acutmore
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acutmore commented Apr 3, 2024 •
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In JavaScript Map and Set do not distinguish 0 and -0 as different keys, instead -0 is normalized to 0.

This leads to the following 'bug':

const { tuple } = require("immutable-tuple");

if (Math.random() > 0.5) {
    tuple(Object, -0); // sometimes create this first
} else {
    tuple(Object, 0); // other times create this first
}

function isNegativeZero(n) {
  return Object.is(n, -0);
}

console.log(isNegativeZero(tuple(Object, -0)[1])); // sometimes 'true', sometimes 'false'
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@acutmore
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