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Why “0” is not equal to false in if condition in JavaScript ?
  • Last Updated : 28 Jun, 2019
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The reason behind this behavior is that JavaScript treats non-empty string as true. First, “0” is converted into its boolean value, by automatic type conversion which is true. Therefore, if statement executes.

Example: This example illustrates why “0” is not equal to false in if() condition.




<script>
      
    // JavaScript script to demonstrate 
    // why “0” is not equal to false in
    // ‘if’ condition
      
    function GFG() {
      
        // Print type of "0"
        document.write(typeof "0" + "</br>");
      
        // Print boolean value of "0"
        document.write(Boolean("0") + "</br>");
          
        // Boolean value of "0" is true so
        // 'if' part will execute
        if("0") {
            document.write("if part executed");
        }
        else {
            document.write("else part executed");
        }
    }
      
    // Driver code
    GFG();
  
</script>                    

Output:

string
true
if part executed

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