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Bump to v4.0.0.

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This commit is contained in:
John-David Dalton
2015-09-17 17:52:09 -07:00
parent 1d77dfa4b7
commit 54e7baecc3
675 changed files with 11257 additions and 8085 deletions
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19
internal/createRound.js
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@@ -1,8 +1,9 @@
/** Native method references. */
var pow = Math.pow;
import toInteger from '../toInteger';
import toNumber from '../toNumber';
import toString from '../toString';
/**
* Creates a `_.ceil`, `_.floor`, or `_.round` function.
* Creates a function like `_.round`.
*
* @private
* @param {string} methodName The name of the `Math` method to use when rounding.
@@ -11,10 +12,16 @@ var pow = Math.pow;
function createRound(methodName) {
var func = Math[methodName];
return function(number, precision) {
precision = precision === undefined ? 0 : (+precision || 0);
number = toNumber(number);
precision = toInteger(precision);
if (precision) {
precision = pow(10, precision);
return func(number * precision) / precision;
// Shift with exponential notation to avoid floating-point issues.
// See [MDN](https://mdn.io/round#Examples) for more details.
var pair = (toString(number) + 'e').split('e'),
value = func(pair[0] + 'e' + (+pair[1] + precision));
pair = (toString(value) + 'e').split('e');
return +(pair[0] + 'e' + (+pair[1] - precision));
}
return func(number);
};