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    <HEAD>
                  Factopedia                             <TITLE> Sum of first 5 natural numbers </TITLE>

                                                     </HEAD>
                                                     <BODY>
                                                     <SCRIPT>
                                                       var sum = 0;
                                                       for(var i=1; i <= 5; i++)
                                                       {

                                                         sum = sum + i;
                        Some programming
                                                       }
                           languages use
                                                       document.write("Sum of first 5 natural numbers
                       semicolon at the end
                                                     = ", sum);
                        of the statement to
                         terminate it. But in        </SCRIPT>
                        JavaScript, you can          </BODY>
                        start your statement         </HTML>
                          with semicolon.

                                                                Let’s Back-uP
                             JavaScript                 •   In JavaScript, the statements that are used to repeat a set
                        frameworks are best                 of instructions are called iterative or looping statements
                       suited for mobile app                or simply loops.
                           development.
                                                        •   The for statement or loop is used to repeat an instruction
                                                            or a set of instructions for a fixed number of times.

                                                        •   The  while  statement  or  loop  is  used  to  repeat  a  set  of
                                                            instructions until a conditional expression returns True.
                                                        •   The do-while loop is used to execute a set of statements
                                                            repeatedly, if the number of iterations is not known.
                                                        •   When a loop is used inside another loop then it is called a
                          JavaScript is not
                        allowed Hyphens in                  nested loop.
                        the varibale names.             •  The loop that is never ends is called infinite loop.
                          Hyphens will be               •   The  break  statement  halts  the  execution  of  a  loop  and
                         identified as minus                program flow switches to the statement after the loop.
                                sign.                   •   The continue statement stops the execution of the current
                                                            iteration of the loop and sends the control of the program
                                                            to the beginning of the loop for next iteration.

                      108   Premium Edition-VIII

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