Arithmetic Operators in JavaScript

JavaScript simplifies the use of arithmetic operators as shown in this table:

	
	Operator		Sample expression						Meaning 
	-=				x-= 4							x = x - 4

	+=				x+= 4							x = x + 4
   
	*=				x*= 4							x = x * 4
   
	/=				x/= 4							x = x / 4
   
	%=				x%= 4							x = x % 4
  
	--				x--						postdecrement: use the value of x and then decrement by 1
   
	--				--x						predecrement: decrement by 1 and then use the value of x
  
	++				x++						postincrement: use the value of x and then increment by 1
  
	++				++x						preincrement: increment by 1 and the use the value of x

Loop: Example

Another example of using loops in JavaScript is shown in the following program:
	<!DOCTTYPE html> 

	<!--Loop3.html --> 

		<html> 

			<head> 

				<title> Loop for 5 times </title> 

				<script > 

				<!-- 

				var counter; //counter

				for (counter = 1; counter <=5; ++counter) //begining of the foor loop

					{

						document.writeln("< p style = 'font-size: " + counter + "ex'>HTML 5 font size" + 
                                         counter + "< p>");
	
					} //end of foor

		// --> 

				</script> 

			</head> 

			<body></body> 

		</html>
This figure shows the output of the above JavaScript program and how the Forloop iterates a number of times:


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Date of last modification: March 26, 2019.