factorial

Find the factorial of a number.

Alternatives: factorial.
Similar: factorial.

function factorial(n, k)
// n: a number
// k: denominator factorial [0]

const {factorial} = require('extra-math');


factorial(5);
// → 120
factorial(6);
// → 720
factorial(7);
// → 5040

References

• alawatthe/MathLib factorial.ts
• Permutation: Wikipedia