Format Number with Comma(s) Separating Thousands

Published by Matt in
formattingnumbersregexstrings

Create a function that takes a number as an argument and returns a string formatted to separate thousands.

Examples

formatNum(1000) ➞ "1,000"

formatNum(100000) ➞ "100,000"

formatNum(20) ➞ "20"

Notes

You can expect a valid number for all test cases.

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