Use of underscores (_
) in JavaScript number literals is meant to improve readability. This feature is known as numeric separators (which was introduced in ES12). It can be used like so:
// ES12+ const million = 1_000_000; console.log(million); // 1000000 console.log(million === 1000000); // true
If you wish to deep-dive into the topic, then read the post about what numeric separators are in JavaScript.
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