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

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;
Updated on: 2020-06-15T05:41:11+05:30

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