30-seconds-of-code/snippets/fibonacci.md

title, tags, expertise, firstSeen, lastUpdated

title	tags	expertise	firstSeen	lastUpdated
Fibonacci	math,algorithm	intermediate	2017-12-17T16:41:31+02:00	2020-12-28T13:49:24+02:00

Generates an array, containing the Fibonacci sequence, up until the nth term.

• Use Array.from() to create an empty array of the specific length, initializing the first two values (0 and 1).
• Use Array.prototype.reduce() and Array.prototype.concat() to add values into the array, using the sum of the last two values, except for the first two.

const fibonacci = n =>
  Array.from({ length: n }).reduce(
    (acc, val, i) => acc.concat(i > 1 ? acc[i - 1] + acc[i - 2] : i),
    []
  );

fibonacci(6); // [0, 1, 1, 2, 3, 5]