21 lines
708 B
JavaScript
21 lines
708 B
JavaScript
// from: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/floor
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export default function(type, value, exp) {
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// If the exp is undefined or zero...
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if (typeof exp === "undefined" || +exp === 0) {
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return Math[type](value);
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}
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value = +value;
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exp = +exp;
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// If the value is not a number or the exp is not an integer...
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if (isNaN(value) || !(typeof exp === "number" && exp % 1 === 0)) {
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return NaN;
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}
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// Shift
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value = value.toString().split("e");
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value = Math[type](+(value[0] + "e" + (value[1] ? +value[1] - exp : -exp)));
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// Shift back
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value = value.toString().split("e");
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return +(value[0] + "e" + (value[1] ? +value[1] + exp : exp));
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}
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