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Snippets

Numbers​

GCD & LCM​

const gcd = (a, b) => (a ? gcd(b % a, a) : b);

// LCM of two numbers
const lcm = (a, b) => (a * b) / gcd(a, b);

// LCM of an array of numbers
const lcm = (nums) => nums.reduce((a, b) => (a * b) / gcd(a, b));

Arrays​

Combinations​

const combinations = (array) =>
    Array(1 << array.length)
        .fill()
        .map((_, i) => array.filter((_, j) => i & (1 << j)));