filter

filter(target, predicate)

Filters a value based on a predicate function. If the value is null or undefined, it returns the value unchanged. If the value satisfies the predicate, it returns the value. Otherwise, it returns undefined.

data-first

filter(5, (x) => x > 3); // 5
filter(2, (x) => x > 3); // undefined
filter(null, (x) => x > 3); // null
filter(undefined, (x) => x > 3); // undefined

data-last

pipe(
    5,
    filter((x) => x > 3),
); // 5

pipe(
    2,
    filter((x) => x > 3),
); // undefined