30-seconds-of-code/snippets/weightedAverage.md

title, tags

title	tags
weightedAverage	math,array,beginner

Returns the weighted average of two or more numbers.

• Use Array.prototype.reduce() to add each value to an accumulator, initialized with a value of 0 and divide by the length of the array.

const weightedAverage = (nums, weights) => 
  nums.reduce((acc, n, i) => acc + (weights[i] * n), 0) / nums.length;

weightedAverage([1, 2, 3], [0.6,0.2,0.3]); // 0.6333