How to get total sum of array

Question

i'm trying to add together the contents of an array (integers). for example:

var myArray;
var answer;
myArray[0]=2;
myArray[1]=5;
answer=myArray[0]+myArray[1];

answer should equal 7.Could you help me, please? Thank you so much.

Answer 1

You need to initialize your array

var myArray = [];

As you get more values into your array you might consider a loop, example:

var myArray = [];
var answer = 0;
myArray[0]=2;
myArray[1]=5;

for (var i=0;i<myArray.length;i++)
{ 
   answer += myArray[i];
}

console.log(answer);

Take a look at this: http://www.w3schools.com/js/js_loop_for.asp

Answer 2

When I run your code, I get an error.

you need to intialize your variable myArray to be an array.

var myArray = [];

After I do that, answer has the expected value.

Answer 3

You need to declare myArray as an array, otherwise myArray[0] means a property named 0 on undefined (which will probably blow up) rather than an index access.

var myArray = [];
...