How to Resolve Unexpected Rounding Behavior with toFixed() Method in Javascript?

toFixed Not Rounding Up in Javascript

When using the toFixed method in Javascript to round numbers, users may encounter unexpected results, where decimals are not rounded up as anticipated. In particular, numbers like 859.385 may only display as 859.38 instead of the expected 859.39.

Certain browsers handle rounding calculations differently, leading to discrepancies when comparing Javascript calculations to those performed in PHP. To address this, a robust solution has emerged: Mozilla's toFixed10() method.

This method consistently provides accurate rounding behavior across all browsers. Here's a convenient one-liner that leverages toFixed10():

<code class="javascript">function toFixed( num, precision ) {
    return (+(Math.round(+(num + 'e' + precision)) + 'e' + -precision)).toFixed(precision);
}</code>

With this function, you can ensure that rounding operations in Javascript align seamlessly with those in PHP, regardless of the browser environment.

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