@putout/plugin-apply-flat-map

@putout/plugin-apply-flat-map

The flatMap() method returns a new array formed by applying a given callback function to each element of the array, and then flattening the result by one level. It is identical to a map() followed by a flat() of depth 1 (arr.map(...args).flat()), but slightly more efficient than calling those two methods separately.

(c) MDN

🐊Putout plugin adds ability to apply flatMap(). Check out in 🐊Putout Editor.

Install

npm i @putout/plugin-apply-flat-map

Rule

{
    "rules": {
        "apply-flat-map": "on"
    }
}

❌ Example of incorrect code

array.map(getId).flat();

✅ Example of correct code

array.flatMap(getId);

Comparison

Linter	Rule	Fix
🐊 Putout	apply-flat-map	✅
⏣ ESLint	unicorn/prefer-flat-map	✅
🏛 Rome	useFlatMap	✅

License

MIT