JavaScript Arithmetics


Arithmetic operators take either literals or variables (numerical) values and use them as their operands. The operation will return a single numerical value. In JavaScript we find four standard arithmetic operators and they are addition (+), subtraction (-), multiplication (*), and division (/).

JS JavaScript - Check out some Arithmetic operators

<!DOCTYPE html><html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Arithmetics test</title>
</head>
    <body>
    <h1>Check some aritmetics</h1>
    <p>One of your paragraphs.</p><button onclick="testArithmetics()">Click me to test</button><script>
        function testArithmetics() 
        { 
            alert(5 + 4 - 2);  
            alert(5 * 2 / 2);  
            alert(11 % 3 ** 2);
        }
    </script>
    </body>
</html>

Addition (+)

JS JavaScript - Addition (+)

<!DOCTYPE html>

<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Arithmetics test</title>
</head>
<body>
    <h1>Test addtion</h1>
    <p>One of your paragraphs.</p>
    
    <button onclick="testAddition()">Click me to test</button>
    
    <script>
        function testAddition() 
        { 
            alert(1 + 3)           
            alert(true + 2)        
            alert(false + false)   
            alert(5 + 'Lalle')     
            alert('Lalle' + false) 
            alert('Lalle' + 'bar') 
        }
    </script>
</body>
</html>

Subtraction (-)

JS JavaScript - Subtraction (-)

<!DOCTYPE html>

<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Arithmetics test</title>
</head>
    <body>
    <h1>Test Subtraction</h1>
    <p>This is how you can use Substraction</p>

    <button onclick="testSubtraction()">Click me to test</button>

    <script>
        function testSubtraction() 
        { 
            alert(6 - 3)       
            alert(4 - 5)       
            alert('foo' - 3)   
        }
    </script>
    </body>
</html>

Division (/)

JS JavaScript - Division (/)

<!DOCTYPE html>

<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Arithmetics test</title>
</head>
    <body>
    <h1>Test Division</h1>
    <p>This is how you can use Division</p>

    <button onclick="testDivision()">Click me to test</button>

    <script>
        function testDivision() 
        { 
	        alert(1 / 2)     
	        alert(1.0 / 2.0) 
	        alert(2.0 / 0)   
	        alert(2.0 / 0.0) 
	        alert(2.0 / -0.0)
        }
    </script>
    </body>
</html>

Multiplication (*)

JS JavaScript - Multiplication (*)

<!DOCTYPE html>

<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Arithmetics test</title>
</head>
    <body>
    <h1>Test Multiplication</h1>
    <p>This is how you can use Multiplication</p>
    
    <button onclick="testMultiplication()">Click me to test</button>
    
    <script>
        function testMultiplication() 
        { 
		    alert(6 * 4)                
		    alert(-3 * 5)               
		    alert(Infinity * 0)         
		    alert(Infinity * Infinity)  
		    alert('Lalle' * 3)          
        }
    </script>
    </body>
</html>

Remainder (%)

JS JavaScript - Remainder (%)

<!DOCTYPE html>

<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Arithmetics test</title>
</head>
    <body>
    <h1>Test Remainder</h1>
    <p>This is how you can use Remainder</p>

    <button onclick="testRemainder()">Click me to test</button>

    <script>
        function testRemainder() 
        { 
            alert(14 % 5)    
            alert(- 1 % 4)   
            alert(1 % -4)    
            alert(NaN % 2)   
            alert(1 % 2)     
            alert(2 % 3)     
            alert(-4 % 2)    
            alert(7.5 % 2)   
        }
    </script>
    </body>
</html>

Exponentiation (**)

JS JavaScript - Exponentiation (**)

<!DOCTYPE html>

<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Arithmetics test</title>
</head>
    <body>
    <h1>Test Exponentiation</h1>
    <p>This is how you can use Exponentiation</p>
    
    <button onclick="testExponentiation()">Click me to test</button>
    
    <script>
        function testExponentiation() 
        { 
            <!--alert(-2 ** 2); 
            alert(-(5 ** 2)); 
        }
    </script>
    </body>
</html>

Increment (++)

JS JavaScript - Increment (++)

<!DOCTYPE html><html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Arithmetics test</title>
</head>
    <body>
    <h1>Check some aritmetics</h1>
    <p>How to use Increment</p>

    <button onclick="testIncrement()">Click me to test</button>

    <script>
        function testIncrement() 
        { 
            // Postfix 
            var x = 3;
            y = x++;

            // Prefix
            var a = 2;
            b = ++a;

            var result = "y=" + y + " x=" + x + " a=" + a + " b=" + b;  

            document.getElementById("resultElement").innerHTML = result;
        }
    </script>

    <p id="resultElement"></p>

    </body>
</html>

Decrement (--)

JS JavaScript - Decrement (--)

<!DOCTYPE html>

<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Arithmetics test</title>
</head>
    <body>
    <h1>Check some aritmetics</h1>
    <p>How to use Decrement</p>
    
    <button onclick="testDecrement()">Click me to test</button>
    
    <script>
        function testDecrement() 
        { 
            // Postfix 
            var x = 3;
            y = x--; 
            
            // Prefix
            var a = 2;
            b = --a;
            
            var result = "y=" + y + " x=" + x + " a=" + a + " b=" + b;  

            document.getElementById("resultElement").innerHTML = result;
        }
    </script>
    
    <p id="resultElement"></p>
    
    </body>
</html>

Unary negation (-)

JS JavaScript - Unary negation (-)

<!DOCTYPE html>

<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Arithmetics test</title>
</head>
    <body>
    <h1>Check some aritmetics</h1>
    <p>How to use Unary Negation</p>
    
    <button onclick="testUnaryNegation()">Click me to test</button>
    
    <script>
        function testUnaryNegation() 
        { 
            var x = 3;
            y = -x;    
            
            var x = "7";
            y = -x;
            
            var result = "y=" + y + " x=" + x;  

            document.getElementById("resultElement").innerHTML = result;
        }
    </script>
    
    <p id="resultElement"></p>
    
    </body>
</html>

Unary plus (+)

JS JavaScript - Unary plus (+)

<!DOCTYPE html>

<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Arithmetics test</title>
</head>
    <body>
    <h1>Check some aritmetics</h1>
    <p>How to use Unary Plus</p>
    
    <button onclick="testUnaryPlus()">Click me to test</button>
    
    <script>
        function testUnaryPlus() 
        { 
            var a = +5;           
            var b = + '5';        
            var c = + true;       
            var d = + false;      
            var e = + null;      
            var f = + function (val) { return val }; 
            
            var result = "a=" + a + " b=" + b + " c=" + c + " d=" + d + " e=" + e + " f=" + f;  

            document.getElementById("resultElement").innerHTML = result;
        }
    </script>
    
    <p id="resultElement"></p>
    
    </body>
</html>

Learn more about JavaScript Operators
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A JavaScript string stores a series of characters like "Jonny ....

JS JavaScript: Operator Precedence

With operator precedence we describe the order in which operations are executed when expressions are evaluated. The operations with a higher precedence will run before the operations with a lower precedence. For example, multiplication is performed before addition.

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