我的 Javascript AVG 计算器不工作。 我该如何解决？

Question

I wanted to create a function that calculate the average between some numbers. I wanted to make it that i could put as many numbers as i wanted in the console.log but this code apparently doesn't work, when i console.log it says "infinity". Need help please

function avg(...args){
      return args.reduce(function (a, b) {
        return a + b / avg.length
      })
    }
    console.log(avg(1, 2, 3, 4, 5))

Answer 1

This is because the variable avg does not exist, and it will default to 0. Causing it to be Infinity .

You also have 2 additional mistakes.

1. You have not used parenthesis, you are essentially doing a + ( b / len ) which will lead to an incorrect answer

2. You are using incorrect formula for average, in the implementation that you are using, you should be using the running average formula: refer here: How to calculate moving average without keeping the count and data-total?

this would be the correct solution:

    function avg(...args) {
        const sum = args.reduce((a,b) => a + b , 0 );
        return sum / args.length;
    }

Answer 2

You can use reduce and arguments length like this. You had some mistakes in your code.

 const average = (...args) => args.reduce((a, b) => a + b) / args.length; console.log(average(1,2,3,4))