JavaScript function that adds commas to large numbers | Number.isInteger(), Math.floor(), slice()

Publicado em: 28 Maio 2020
no canal de: PHP scripts 2020

1,693

In this video, we are going to learn how to add commas to large numbers. In English, we use commas to group the digits of large numbers into threes. This practice drastically improves readability. In JavaScript, however, integers are stored and processed with no commas regardless of how small or big they are. For this reason, we have to create a custom function that adds commas to the numbers stored in JavaScript variables before displaying them on an HTML page.

e.g.

JavaScript: let nPages = 1083;
HTML: 1,083 pages

JavaScript: let price = 12985;
HTML: £12,985

JavaScript: let nViews = 287530;
HTML: 287,530 views

JavaScript: let nSubscribers = 2470937;
HTML: 2,470,937 subscribers

JavaScript: let population = 20189201;
HTML: a population of 20,189,201

JavaScript: let currentDistanceToMars = 157921823;
HTML: 157,914,823 km

JavaScript: let GDP = 20809217620725;
HTML: $20,541,317,620,725

We will name this function addCommas(). The parameter of the function is a whole number greater than or equal to 1,000. And its output is the same number but with commas added. When the number is passed to the function, the number is an integer, but when it is outputted with commas added, the number is no longer an integer but a string. To be completely sure that the function really works, I tested the function in a very rigorous way. Specifically, I used an array of large and very large numbers, randomly generated., e.g.

1000
8928
77614
846008
5242414
92333111
593437737
2304220622
73346433504
995652222448
1551159724126
47939888725917

The function also comes with its own error handlers that scrutinise the input received by the function. The error messages are personalised and can be found in the console of the browser.

Further links
PHP function that adds commas to large numbers:    • PHP function that adds commas to large num...

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Disclaimer: this video is meant to be a proof of concept.

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