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How to add a number and a string in JavaScript?
In javascript , we can add a number and a number but if we try to add a number and a string then, as addition is not possible, 'concatenation' takes place.
In the following example, variables a,b,c and d are taken. For variable 'a', two numbers(5, 5) are added therefore it returned a number(10). But in case of variable 'b' a string and a number ('5', 5) are added therefore, since a string is involved, we get the result as '55', which is a string. since strings are involved, Variables 'c' and 'd' also return a string as shown in the output.
Example
<html>
<body>
<script type="text/javascript">
var a = 5 + 5;
var b = "5" + 5;
var c = 5 + 5 + "5" + 5
var d = "Hello" + 5;
document.write(a + "<br>" + b + "<br>" + c + "</br>" + d);
document.write("</br>");
document.write(typeof(a));
document.write("</br>");
document.write(typeof(b));
document.write("</br>");
document.write(typeof(c));
document.write("</br>");
document.write(typeof(d));
</script>
</body>
</html>Output
10 55 1055 Hello5 number string string string
Updated on: 29-Jun-2020
9K+ Views
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