Underscores in numbers

Jan 8, 2025

Learn how JavaScript numeric separators let you add underscores inside numbers like 1_000 for readability, a feature available since ECMAScript 2021.

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TIL you can add underscores in the middle of any number in JavaScript, to improve its readability according to what the number means to you:

1_000 //1000
2_3_4 //234

It’s a relatively new feature (since ECMAScript 2021), but supported by all major browsers since years.

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