Function weightedAverage

Parameters

• Rest ...ns: [number, number][]

  Any number of [weight, number] tuples.

  For example: weightedAverage([1, 0], [3, 1]) returns 0.75.

  • One part 0, three parts 1. That adds up to four parts, which means each part is worth 0.25.
  • Three parts 1 means 0.25 * 3, one part 0 means 0 * 1.
  • 0.75 + 0 is 0.75.