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26 lines
782 B
JavaScript
26 lines
782 B
JavaScript
/**
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* Creates a function like `round`.
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*
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* @private
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* @param {string} methodName The name of the `Math` method to use when rounding.
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* @returns {Function} Returns the new round function.
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*/
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function createRound(methodName) {
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const func = Math[methodName]
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return (number, precision) => {
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precision = precision == null ? 0 : Math.min(precision, 292)
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if (precision) {
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// Shift with exponential notation to avoid floating-point issues.
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// See [MDN](https://mdn.io/round#Examples) for more details.
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let pair = `${number}e`.split('e')
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const value = func(`${pair[0]}e${ +pair[1] + precision }`)
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pair = `${value}e`.split('e')
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return +`${pair[0]}e${+pair[1] - precision}`
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}
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return func(number)
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}
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}
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export default createRound
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