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@dexia

JavaScriptで整数を安全な範囲で扱う

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　Number.MAX_SAFE_INTEGER、Number.MIN_SAFE_INTEGERを使えば、精度が保証される範囲の整数値を取得できるのでそれを使います。

　以下は、30 seconds of codeより引用です。

const toSafeInteger = num =>
  Math.round(Math.max(Math.min(num, Number.MAX_SAFE_INTEGER), Number.MIN_SAFE_INTEGER));

toSafeInteger('3.2'); // 3
toSafeInteger(Infinity); // 9007199254740991
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