CODEWITHSUNDEEP
javascript
Dymond
Dymond

Reputation: 2277

add values to one variable with for loop totalSum Javascript

I have some values that come randomized to an variable. Now i want to add every value to each other to get an total sum but the loop wont add them together.

The index variable work when i console log it. but not the total sum of a current value and the index value. Any tips ?

This is the loop // The indexValue is values I get from an array//

  var indexValue = index;  // Random number from 1 - 10
    var totalSum = 0;

   for(var x = 0; x <indexValue; x++){

   var currentValue = index[x];
   totalSum += currentValue;
    }

    console.log(totalSum);

Upvotes: 0

Views: 21232

Answers (2)

War10ck
War10ck

Reputation: 12508

I'm assuming since you're referencing index[x] that index is an array. If so, you are assigning the wrong value to indexValue. Try this:

var indexValue = index.length;

What this does is assign the length of the array to the variable indexValue. Now the for loop will run from 0 to n where n is the length of the array.

This should get you the values you need.

Hope this helps.

EDIT:

Below is a link to a jsFiddle I created with your example and the code explained:

jsFiddle

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

var indexValue = index.length;  // It's imperative that this is an array
var totalSum = 0;

for(var x = 0; x <indexValue; x++){
    totalSum += index[x];
}

alert(totalSum);

The code above is a modified version of what you posted. The current value is not needed and has been removed. In this case, I created an array and stored the values in index. The length is computed, and the values are added together.

For the easy sake of testing, I changed console.log(totalSum); to alert(totalSum);. It will produce the same value just the same.

Just a reference note on console.log. Some browsers (mainly IE) who do not attach the debugger to the process automatically without a page refresh will through an error as console will be undefined. Here is a quick fix for that:

if(window.console && window.console.log) {
    console.log(totalSum);
}

This checks that (a) the console object is attached to the global window object and (b) that the log object of console is attached to the console object.

Upvotes: 2

Mike Corcoran
Mike Corcoran

Reputation: 14565

you probably want something like this:

var sum = 0;
for (var i=0; i < index.length; i++) {
    sum += index[i];
}
console.log(sum);

Upvotes: 0

Related Questions