Why the output is 8800481086, why not 169090?

Question

var a ="88004";
var b="81086";
alert(a+b);

Answer 1

Because you are concatenating two strings instead of adding two integers.

Imagine adding two words together: "one" + "two". The answer would not be "three" because those are words, not numbers. The answer is "onetwo."

If they are integers: 1+2 = 3.

Answer 2

Thank you so much Joseph for your quick reply and explaining with example. thank again😊