Summing an Array in Javascript

Question

Summing an Array in Javascript

I am having trouble calculating the sum of an array in my code. Instead of adding up all the numbers, it is concatenating them together. For example, if I have grades 90, 95, and 100, the sum shows as 09590100. The first FOR loop successfully pushes the grades into an array, but the second loop where I calculate the total seems to be incorrect.

var numOfGrades = prompt("How many assignments are there?");
var grades = [];
var sum = 0;
var grade = 0;
var avg = 0;

for (var i = 0; i < numOfGrades; i++) {
    grade = prompt("Enter score");
    grades.push(grade);
}

for (var j = 0; j < grades.length; j++) {
    sum += grades[j];
}

avg = (sum / grades.length)

javascript arrays sum

Answer 1

Answer №1

The issue here is that the input is being treated as a string instead of a number - make sure to properly parse it.

for (var j = 0; j < numScores; j++) {
    score = prompt("Enter grade");
    scores.push(parseInt(score));
}

Answer 2

The issue here is that the input is being treated as a string instead of a number - make sure to properly parse it.

for (var j = 0; j < numScores; j++) {
    score = prompt("Enter grade");
    scores.push(parseInt(score));
}

Answer 3

Answer №2

To ensure accurate calculations, it is important to use the parseInt function in Javascript when dealing with grade values treated as strings. By explicitly converting them to integers, you can perform computations successfully. Here is an example:

http://jsfiddle.net/conkman/5Eu7T/

$(document).ready(function(){
var numOfGrades = prompt("How many total assignments?");
var grades = [];
var sum = 0;
var grade = 0;
var avg = 0;

for (var i = 0; i < numOfGrades; i++) {
    grade = prompt("Type in score");
    grades.push(grade);

}

for (var j = 0; j < grades.length; j++) {
    sum += parseInt(grades[j]);
}

avg = (sum / grades.length);
alert(avg);

});

For more information on parseInt, refer to the documentation: http://www.w3schools.com/jsref/jsref_parseint.asp

Answer 4

To ensure accurate calculations, it is important to use the parseInt function in Javascript when dealing with grade values treated as strings. By explicitly converting them to integers, you can perform computations successfully. Here is an example:

http://jsfiddle.net/conkman/5Eu7T/

$(document).ready(function(){
var numOfGrades = prompt("How many total assignments?");
var grades = [];
var sum = 0;
var grade = 0;
var avg = 0;

for (var i = 0; i < numOfGrades; i++) {
    grade = prompt("Type in score");
    grades.push(grade);

}

for (var j = 0; j < grades.length; j++) {
    sum += parseInt(grades[j]);
}

avg = (sum / grades.length);
alert(avg);

});

For more information on parseInt, refer to the documentation: http://www.w3schools.com/jsref/jsref_parseint.asp

Summing an Array in Javascript

Answer №1

Answer №2

Similar questions

Ensure that only one button from the collection is activated

The Vue v-for directive encountered an unrecognized property during rendering

The process of implementing server-side rendering for React Next applications with Material-ui using CSS

Using the `setTimeout` function to swap components

Retrieve an HTML document from a specified URL using JavaScript AJAX methods

JQuery.each is causing an issue due to a potential conflict between JSON and string data types

Connecting an admin dashboard to a MERN e-commerce application: A step-by-step guide

If PHP encounters a division by zero, it will return a zero value

Retrieving a value attribute from the isolated controller of a directive

Retrieve a DOCX file via AJAX response

What are some ways to avoid the use of underline and slash symbols in material-ui/pickers?

ERROR: Assignment of incompatible types in expanding pointer array

Asynchronous mismatches occur with React.js useState values

JavaScript: Implement a function that returns an object with key-value pairs instead of a

Maintaining data after page reload in Angular

How can I manually include a triangle in BufferGeometry using Three.js?

In Angular, a variable that is exported from a module may not be accessible within a class function

When attempting to use a context, the type '...' cannot be assigned to type '...'

Suspend operation to delay for ajax call within a websocket

This React.Js application hosted on Heroku is optimized for use on Chrome Desktop browsers