Convert boolean result into number/integer in JavaScript
- Using ternary or conditional operator
- Using unary + operator.
- Using bitwise And (&) or bitwise Or ( | ) operator.
- Using Number() function. It converts data type to number.
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:
- 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 booleanvalue into number.</h4><script>// Initializing boolvalue as truevarboolvalue =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 operatorfunctionmyFunction() {vari = 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 truevarboolvalue =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 operatorfunctionmyFunction(){vari = + boolvalue;document.getElementById("result").innerHTML = i;}</script></body></html> - Output after clicking the button:
- 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 truevarboolvalue =true;// Initializing boolvalue2 as falsevarboolvalue2 =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 operatorfunctionmyFunction(){vari = boolvalue & 1;varj = boolvalue2 | 0;document.getElementById("result").innerHTML = i;document.getElementById("result2").innerHTML = j;}</script></body></html> - Output after clicking the button:
- 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 truevarboolvalue =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() functionfunctionmyFunction(){vari = Number(boolvalue);document.getElementById("result").innerHTML = i;}</script></body></html>
Output after clicking the button:
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