Ethereum: Average calculation doesn’t work well, result is always NaN

Evaluating Array Calculations in Ethereum: A Common Problem

When developing Ethereum, especially when working with arrays and calculations, errors like “NaN” (Not a Number) can arise due to incorrect usage or misinterpretation of data. In this article, we will explore why you might be having trouble calculating averages from your array and provide you with a guide on how to resolve them.

Problem: Calculation Error

Let’s assume your initial setup looks like this:

array var = [1, 2, 3, 4, 5];

You want to calculate the average of these values. In Ethereum, you can do this using the Array.prototype.reduce() method or by manually iterating over the array.

Incorrect Calculation

Here is an example of an incorrect calculation:

var sum = 0;
setInterval(function() {
for (var i = 0; i < array.length; i++) {
sum += array[i];
}
var average = sum / array.length;
}, 1000); // every second
console.log(average);

This code incorrectly calculates the average by adding all the elements in one pass, resulting in a NaN value.

Solution: Correct calculation

To calculate the average correctly, you should use Array.prototype.reduce() or iterate the array using a loop:

var sum = 0;
setInterval(function() {
for (var i = 0; i < array.length; i++) {
sum += array[i];
}
}, 1000); // every second
console.log(sum / array.length);

Or you can use the reduce() method:

var sum = array.reduce((acc, current) => acc + current, 0);
console.log(sum / array.length);

Additional Tips

• Make sure your data is in a valid format and does not contain any errors.

• If you are using an array to store prices or values, make sure that all elements are numbers (e.g. “Number”) to perform accurate calculations.

• If you are dealing with large data sets, consider using more efficient calculation methods or parallel processing techniques.

Conclusion

In this article, we identified the problem of incorrect calculations when averaging values ​​from an array in Ethereum. By understanding why your initial setup was incorrect and using the right logic, you can improve the accuracy of your code and ensure reliable results.