Add numerical value of array elements in function

Question

I have successfully tried to create a function where the numerical value of all elements in an array are being added to a total number, but there seems to be a problem when it comes to assigning different variants for array's length and the array itself respectively.

So here's what ostensibly doesn't work for now

var firstValue = 0;
var secondValue = 0;
var firstArray = [8, 5];
var secondArray = [10, 10];

function calculateSum(x,y) {
    for ( var i = 0; i < y.length; i++) {
  x += y[i];
    }
  return x
}

calculateSum(firstValue, firstArray);
console.log(calculateSum);

Omar Elawady · Accepted Answer · 2015-04-10 14:13:41Z

4

you are loggin the function itself not the returned value.

var a=calculateSum(firstValue, firstArray);
console.log(a);

it outputs 13;

answered Apr 10, 2015 at 14:13

Omar Elawady

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2 Comments

John Over a year ago

Got it, thanks. What I don't seem to understand is why-in the reasoning of informatics, console.log(firstValue) still gives zero. There's supposed to be a reserved memory spot within a computer that modifies the original 0 value everytime it goes through the loop.

Omar Elawady Over a year ago

because javascript passes arguments as value not reference (for primitive types such as strings and numbers).so when you pass varibale to function the variable remains as it is.

user4774017 · Accepted Answer · 2015-04-10 14:17:22Z

3

In the last line you have console.log(calculateSum), however this is the function and not the result of the function.

You need to store the result of calculateSum and then log that.

var firstValue = 0;
var secondValue = 0;
var firstArray = [8, 5];
var secondArray = [10, 10];

function calculateSum(x,y) {
    for ( var i = 0; i < y.length; i++) {
  x += y[i];
    }
  return x
}

var result = calculateSum(firstValue, firstArray);
alert(result);

answered Apr 10, 2015 at 14:17

user4774017

Comments

webduvet · Accepted Answer · 2015-04-10 14:45:01Z

0

you can use something like this and then add the result to where you need it. In this example you get sum of all values in yourArray and the firstValue.

var sum = yourArray.reduce(function(pe,ce){
  return pe + ce;
}, firstValue);

link to some docs

answered Apr 10, 2015 at 14:45

webduvet

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