JavaScript Booleans

A boolean data type returns either one of two values, namely true or false. Boolean is a function that can be used in JavaScript to determine whether a variable, object, condition, expression, etc. has a true or false value.

Example

<!DOCTYPE html>
<html>
<body>

<h1>JS Booleans</h1>
<script>
    function myFunction() {
        document.write(Boolean(10));
    }
    myFunction();
</script>

</body>
</html>

Preview

JavaScript's Boolean() function

The result of a boolean function is the variable's boolean value. It may also be employed to determine the boolean outcome of a condition, expression, etc.

Note: It should be noted that a variable or object with value is considered as a true boolean value. False boolean values are regarded as "0," "NaN," "empty string," "undefined," and "null."

JavaScripts that demonstrate how boolean values function

Code #1: The program below will output true values.

Example

<!DOCTYPE html>
<html>
<body>

<h1>JS Booleans (True)</h1>
<script>
    document.write("Boolean(8): " + Boolean(8) + "<br>");
    document.write("Boolean('Hello World!'): " + Boolean("Hello World!") + "<br>");
    document.write("Boolean(1.50): " + Boolean(1.50) + "<br>");
    document.write("Boolean(-1): " + Boolean(-1) + "<br>");
    document.write("Boolean('true'): " + Boolean("true") + "<br>");
    document.write("Boolean('false'): " + Boolean("false") + "<br>");
    document.write("Boolean(6 * 4 + 2.22): " + Boolean(6 * 4 + 2.22) + "<br>");
    document.write("Boolean(5<10): " + Boolean(5<10) + "<br>");
</script>

</body>
</html>

Preview

Code #2: The program below will output false values.

Example

<!DOCTYPE html>
<html>
<body>

<h1>JS Booleans (False)</h1>
<script>
    var x;
    document.write("Boolean(0): " + Boolean(0) + "<br>");
    document.write("Boolean(''): " + Boolean("") + "<br>");
    document.write("Boolean(x): " + Boolean(x) + "<br>");
    document.write("Boolean(-0): " + Boolean(-0) + "<br>");
    document.write("Boolean(false): " + Boolean(false) + "<br>");
    document.write("Boolean(NaN): " + Boolean(NaN) + "<br>");
    document.write("Boolean(null): " + Boolean(null) + "<br>");
    document.write("Boolean(5>10): " + Boolean(5>10) + "<br>");
</script>

</body>
</html>

Preview

JavaScript Boolean Object

A boolean value is wrapped in an object by a boolean object in JavaScript. The new keyword in JavaScript may also be used to define booleans.

Boolean new syntax (value)

Note: Because the types of v1 and v2 (objects) are different, the statement v1 = == v2 is false.

Example

<!DOCTYPE html>
<html>
<body>

<h1>JS Booleans Object</h1>
<script>
    var x = true;
    var y = new Boolean(true);
    var a = false;
    var b = new Boolean(false);

    document.write('x = = y is: ' + (x == y) + "<br>");
    document.write('x = = = y is: ' + (x === y) + "<br>");
    document.write('a = : ' + a + "<br>");
    document.write('b = : ' + b);
</script>

</body>
</html>

Preview

JS Math

JS Comparisons

JavaScript Booleans

Example

JavaScript's Boolean() function

Example

Example

JavaScript Boolean Object

Example

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