7kyuBeadCount.js

//DESCRIPTION:
//Two red beads are placed between every two blue beads. There are N blue beads. After looking at the arrangement below work out the number of red beads.
// @ @@ @ @@ @ @@ @ @@ @ @@ @
// Implement countRedBeads(n)) so that it returns the number of red beads.
// If there are less than 2 blue beads return 0.

const countRedBeads = n => n < 2 ? 0 : 2 * (n - 1);