Question 329087 in Javascript Question posted in
A very good W3school tutorial can be found here.

Javascript – finding the average of an array with a for loop in a function

I’m trying to find the average value of the array, I’m stumped on how to add the array values together, I have the for loop condition set up ( for ( i = 0; i < array.length; i++)

but how do I add the array values together ??

instructions:

// * PART 1
// * Return the average value for the given array of numbers.
// * Example: getAverage([22, 45, 4, 65]) => 34
// * */

where I’m at:

    function getAverage(array) {    
      for ( let i = 0; i < array.length; i ++){
      let total =              <-How do I add them together to get the total?
       return total / array.length
     } 

    }

    console.log(getAverage([20, 22, 24, 26]));
Tags:

2

Answers


  1. 0

    You want the + operator.
    Create a variable outside of your loop, set it to 0, and add the value each time.

    function getAverage(array) {
    let total = 0;
    for (let i = 0; i < array.length; i++) {
        total += array[i];
    }
    return total / array.length;
}
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  2. 0

    This is the perfect opportunity to use a reducer.

    function getAverage(array) {
    return array.reduce((sum, item) => sum + item, 0) / array.length;
}
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