When needing to format a number I've tended to lean towards [Number.prototype.toFixed()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toFixed), reach for a 3rd party library, or write custom functions. However, with modern browsers, there's a lot of really interesting native capabilities you could start using with [Number.prototype.toLocaleString()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toLocaleString)or [Intl.NumberFormat](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/NumberFormat).

javascript

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Natively Format JavaScript Numbers

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https://app.egghead.io/api/v1/lessons/javascript-natively-format-javascript-numbers/transcript

Natively Format JavaScript Numbers

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