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

title, type, language, tags, cover, dateModified

title	type	language	tags	cover	dateModified
Fibonacci	snippet	javascript	math algorithm	matrix-flow	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]