Javascript Sum Values

Question

I need to sum several values in javascript. I've tried by using following code

var a = 2;
var b = 5;
c = a+b;

But, instead of calculating the values of a and b, the output (c) only combine those two values. So the output given is :

c = 25

I believe you guys can help me easily about this. Thx before. Regard Andha.

Answer 1

Make sure the values are numbers, otherwise they will concat instead of suming.

a = parseInt(a, 10); // a is now int 

Answer 2

Your code is adding (concatenating) strings. Are you sure that the code you posted represents your problem? What you have written should work. Be sure in the real code you're not saying:

var a = '2'; // or something similar

Or if the values are parsed from somewhere, be sure to call parseInt(a, 10) on them before doing the addition, 10 being the radix.

Or as pointed out in the comments the Number function would probably suit your purposes.

Answer 3

The author has probably put "simplified" code so we can get an idea. Had same problem, while getting input values. JS interpreted it as string. Using "Number()" solved the problem:

var sum = Number(document.getElementById("b4_f2_"+i).value) + Number(document.getElementById("b4_f3_"+i).value) + Number(document.getElementById("b4_f4_"+i).value);

Answer 4

This works fine:

var a = 2; 
var b = 5; 
var c = a + b; // c is now 7