npm install @hexlet/pairs-data
import {
l, isList, toString, cons, filter, head, tail
} from '@hexlet/pairs-data';
const numbers = l(3, 4, 5, 6, 7);
toString(numbers); // (3, 4, 5, 6, 7)
const first = head(numbers); // 3
const rest = tail(numbers);
toString(rest); // (4, 5, 6, 7)
isList(first); // false
isList(rest); // true
const newList = cons(8, rest);
toString(newList); // (8, 4, 5, 6, 7)
const filtered = filter((el) => el < 7, newList);
isList(filtered); // true
toString(filtered); // (4, 5, 6)
For more information, see the Full Documentation
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