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Convert boolean result into number/integer in JavaScript
  • Last Updated : 02 Jul, 2019

    A JavaScript boolean represents one of two values: true or false.
    However, if one wants to convert a variable that stores boolean value, into integer “0” or “1”, they can do so using multiple approaches. We will look into some of them in this article.

    The most popular methods are:

  1. Using ternary or conditional operator
  2. Using unary + operator.
  3. Using bitwise And (&) or bitwise Or ( | ) operator.
  4. Using Number() function. It converts data type to number.
    Using ternary or conditional operator:

  • Syntax:
    var i = value ? 1 : 0;
    
  • Program:




    <!DOCTYPE html>
    <html>
      
    <body>
        <center>
            <h1 style="color:green">GeeksforGeeks</h1>
            <h4>Click the button to change the boolean 
                                         value into number.</h4>
            <script>
                // Initializing boolvalue as true
                var boolvalue = true
            </script>
            <button onclick="myFunction()">Change</button>
            <p>The number value of the variable is :</p>
            <p id="result"></p>
            <script>
                // JavaScript program to illustrate boolean 
                // conversion using ternary operator
                function myFunction() {
                    var i = boolvalue ? 1 : 0;
                    document.getElementById("result").innerHTML = i;
                }
            </script>
      </center>
    </body>
      
    </html>
             
  • Output after clicking the button:
    Using unary + operator:

  • Syntax:
    var i = + boolvalue;
    
  • Program:




    <!DOCTYPE html>
    <html>
    <body>
        <center>
            <h1 style="color:green">GeeksforGeeks</h1> 
            <p>Click the button to change the boolean value.</p>
            <script>
                // Initializing boolvalue as true
                var boolvalue = true;
            </script>
            <button onclick="myFunction()">Change</button>
            <p>The value of the variable is now:</p>
            <p id="result"></p>
            <script>
                // JavaScript program to illustrate boolean 
                // conversion using unary operator
                function myFunction(){
                    var i = + boolvalue;
                    document.getElementById("result").innerHTML = i;
                }
            </script>
    </body>
    </html>
             
  • Output after clicking the button:
    Output unary
    Using bitwise And (&) or bitwise Or ( | ) operator.

  • Syntax:
    var i = boolvalue & 1; // bitwise and
    var j = boolvalue | 0; // bitwise or
    
  • Program:




    <!DOCTYPE html>
    <html>
    <body>
        <center>
            <h1 style="color:green">GeeksforGeeks</h1> 
            <p>Click the button to change the boolean value.</p>
            <script>
                // Initializing boolvalue as true
                var boolvalue = true;
                // Initializing boolvalue2 as false
                var boolvalue2 = false;
            </script>
            <button onclick="myFunction()">Change</button>
            <p>The value of the variable 1 is now:</p>
            <p id="result"></p>
            <p>The value of the variable 2 is now:</p>
            <p id="result2"></p>
            <script>
                // JavaScript program to illustrate boolean 
                // conversion using bitwise operator
                function myFunction(){
                    var i = boolvalue & 1;
                    var j = boolvalue2 | 0;
                    document.getElementById("result").innerHTML = i;
                    document.getElementById("result2").innerHTML = j;
                }
            </script>
    </body>
    </html>
             
  • Output after clicking the button:
    output bitwise
    Using Number() function. It converts data type to number.:

  • Syntax:
    var i = Number(boolvalue);
    
  • Program:




    <!DOCTYPE html>
    <html>
    <body>
        <center>
            <h1 style="color:green">GeeksforGeeks</h1> 
            <p>Click the button to change the boolean value.</p>
            <script>
                // Initializing boolvalue as true
                var boolvalue = true;
            </script>
            <button onclick="myFunction()">Change</button>
            <p>The value of the variable is now:</p>
            <p id="result"></p>
            <script>
                // JavaScript program to illustrate boolean 
                // conversion using Number() function
                function myFunction(){
                    var i = Number(boolvalue);
                    document.getElementById("result").innerHTML = i;
                }
            </script>
    </body>
    </html>
             

    Output after clicking the button:
    Output Number()




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