Using Javascript to create an array filled with even numbers up to 100 and then calculating the average

Question

Using Javascript to create an array filled with even numbers up to 100 and then calculating the average

Hey there, I'm struggling with a class assignment that involves finding the average of an array of even numbers that we're supposed to generate. Unfortunately, I can't seem to get it working properly.

var arrayOfNumbers = [];
for (var num = 1; num <= 100; num++) {
  if (num % 2 == 0) {
    arrayOfNumbers.push(num);
  }
}
var sum = 0;

for (var index in arrayOfNumbers) {
  sum += arrayOfNumbers[index];
  sum / 50;
}

document.write(sum);

I've included the code above - could you please point out what I might be doing wrong? It seems like the array isn't populating with even numbers as expected. Any assistance would be greatly appreciated since my professor doesn't respond to emails quickly.

Thank you!

javascript arrays

Answer 1

Answer №1

There is an alternative way to solve this without using an array:

sum = 0;
count = 0;
for (var num = 1; num <= 100; num++) {
    if(num % 2 == 0) {
        sum += num;
        count++;
    }
}
document.write(sum/count);

However, if you prefer to use an array:

var newArray = [];
for (var num = 1; num <= 100; num++) {
    if(num % 2 == 0) {
        newArray.push(num);
    }
}
var newTotal = 0;
for(var index in newArray) { 
  newTotal += newArray[index]; 
}
document.write(newTotal/newArray.length);

Answer 2

There is an alternative way to solve this without using an array:

sum = 0;
count = 0;
for (var num = 1; num <= 100; num++) {
    if(num % 2 == 0) {
        sum += num;
        count++;
    }
}
document.write(sum/count);

However, if you prefer to use an array:

var newArray = [];
for (var num = 1; num <= 100; num++) {
    if(num % 2 == 0) {
        newArray.push(num);
    }
}
var newTotal = 0;
for(var index in newArray) { 
  newTotal += newArray[index]; 
}
document.write(newTotal/newArray.length);

Answer 3

Answer №2

To get the sum of all elements and calculate the average, you can utilize a reducer function. Remember to use == instead of i % 2 = 0. See the example implementation below.

let numberArray = [];

// populate array
for (let i = 1; i <= 100; i++) {
  if (i % 2 == 0) {
    numberArray.push(i);
  }
}

// compute total
const totalSum = numberArray.reduce((accumulator, currentValue) => accumulator + currentValue, 0);

// find average
const averageValue = totalSum / numberArray.length;

document.write(averageValue);

Answer 4

To get the sum of all elements and calculate the average, you can utilize a reducer function. Remember to use == instead of i % 2 = 0. See the example implementation below.

let numberArray = [];

// populate array
for (let i = 1; i <= 100; i++) {
  if (i % 2 == 0) {
    numberArray.push(i);
  }
}

// compute total
const totalSum = numberArray.reduce((accumulator, currentValue) => accumulator + currentValue, 0);

// find average
const averageValue = totalSum / numberArray.length;

document.write(averageValue);

Using Javascript to create an array filled with even numbers up to 100 and then calculating the average

Answer №1

Answer №2

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