24 lines
785 B
JavaScript
24 lines
785 B
JavaScript
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'use strict';
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var sign = require('../internals/math-sign');
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var abs = Math.abs;
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var EPSILON = 2.220446049250313e-16; // Number.EPSILON
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var INVERSE_EPSILON = 1 / EPSILON;
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var roundTiesToEven = function (n) {
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return n + INVERSE_EPSILON - INVERSE_EPSILON;
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};
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module.exports = function (x, FLOAT_EPSILON, FLOAT_MAX_VALUE, FLOAT_MIN_VALUE) {
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var n = +x;
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var absolute = abs(n);
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var s = sign(n);
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if (absolute < FLOAT_MIN_VALUE) return s * roundTiesToEven(absolute / FLOAT_MIN_VALUE / FLOAT_EPSILON) * FLOAT_MIN_VALUE * FLOAT_EPSILON;
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var a = (1 + FLOAT_EPSILON / EPSILON) * absolute;
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var result = a - (a - absolute);
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// eslint-disable-next-line no-self-compare -- NaN check
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if (result > FLOAT_MAX_VALUE || result !== result) return s * Infinity;
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return s * result;
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};
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