String and addition operator (+) : Arithmetic operator « Operators « JavaScript Tutorial






  1. JavaScript Tutorial
  2. Operators
  3. Arithmetic operator

If the values on either side of the addition operator are strings, the strings are concatenated together.

If only one of the values is a string, the other value is converted to a string and concatenated with the first value.

<html>
<SCRIPT LANGUAGE="JavaScript">
<!--
    var sStringVar1 = "Hello";
    var sStringVar2 = "World";
    var nNumVar1 = 5;
    var nNumVar2 = 10;

    var sStringTotal = sStringVar1 + sStringVar2;
    var nNumTotal = nNumVar1 + nNumVar2;
    var sStringNumTotal = sStringTotal + nNumTotal;


    document.write("<b>The string total is: </b>"+sStringTotal+"<BR>");
    document.write("<b>The numeric total is: </b>",nNumTotal,"<BR>");
    document.write("<b>The string + numeric total is: </b>",sStringNumTotal);

-->
</SCRIPT>
</html>








2.1.Arithmetic operator
2.1.1.Compound assignment operators
2.1.2.Arithmetic Operators (+)
2.1.3.Append two strings together
2.1.4.Add string and integer together
2.1.5.+ (Addition) with data type conversion
2.1.6.+= (Addition Assignment)
2.1.7.Subtraction (-)
2.1.8.Multiplication (*)
2.1.9.*= (Multiplication Assignment)
2.1.10.Division (/)
2.1.11.Working With JavaScript Divide Operators
2.1.12./= (Division Assignment)
2.1.13.Arithmetic operator in action
2.1.14.Unary Negation
2.1.15.String and addition operator (+)