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35 lines
1.2 KiB
35 lines
1.2 KiB
import root from './_root.js'; |
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import toInteger from './toInteger.js'; |
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import toNumber from './toNumber.js'; |
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import toString from './toString.js'; |
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/* Built-in method references for those with the same name as other `lodash` methods. */ |
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var nativeIsFinite = root.isFinite, |
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nativeMin = Math.min; |
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/** |
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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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var func = Math[methodName]; |
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return function(number, precision) { |
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number = toNumber(number); |
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precision = precision == null ? 0 : nativeMin(toInteger(precision), 292); |
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if (precision && nativeIsFinite(number)) { |
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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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var pair = (toString(number) + 'e').split('e'), |
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value = func(pair[0] + 'e' + (+pair[1] + precision)); |
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pair = (toString(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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