Answers for "javascript writing function to average"

calculate average javascript

var sum = array.reduce((a, b) => a + b, 0);	//get sum of all elements in array
var avg = (sum / array.length) || 0; //get average of all elements in array ;)

javascript average of arguments

const average = (...args) => args.reduce((a, b) => a + b) / args.length;

// Example
average(1, 2, 3, 4);    // 2.5