Why avoid increment (“++”) and decrement (“--”) operators in JavaScript?

Javascript Web Development Front End Technology

The increment and decrement operators should be avoided since it can lead to unexpected results. Here are some of the conditions:

In an assignment statement, it can lead to unfavorable results:

Example

Live Demo

<html>
   <body>
      <script>
         var a = 5;
         var b = ++a; var c = a++;
         var d = ++c;
         document.write(a);
         document.write("\r"+b);
         document.write("\r"+c);
         document.write("\r"+d);
      </script>
   </body>
</html>

Output

Whitespace between the operator and variable can also lead to unexpected results:

a = b = c = 1; ++a ; b -- ; c;

Rahul Sharma

Published on 18-Jan-2018 13:33:59

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