1  var root = require('./_root'),
 2      toInteger = require('./toInteger'),
 3      toNumber = require('./toNumber'),
 4      toString = require('./toString');
 5  
 6  /* Built-in method references for those with the same name as other `lodash` methods. */
 7  var nativeIsFinite = root.isFinite,
 8      nativeMin = Math.min;
 9  
10  /**
11   * Creates a function like `_.round`.
12   *
13   * @private
14   * @param {string} methodName The name of the `Math` method to use when rounding.
15   * @returns {Function} Returns the new round function.
16   */
17  function createRound(methodName) {
18    var func = Math[methodName];
19    return function(number, precision) {
20      number = toNumber(number);
21      precision = precision == null ? 0 : nativeMin(toInteger(precision), 292);
22      if (precision && nativeIsFinite(number)) {
23        // Shift with exponential notation to avoid floating-point issues.
24        // See [MDN](https://mdn.io/round#Examples) for more details.
25        var pair = (toString(number) + 'e').split('e'),
26            value = func(pair[0] + 'e' + (+pair[1] + precision));
27  
28        pair = (toString(value) + 'e').split('e');
29        return +(pair[0] + 'e' + (+pair[1] - precision));
30      }
31      return func(number);
32    };
33  }
34  
35  module.exports = createRound;