JavaScript code can use comparison operators. Explain how each of the following comparison operators works in JavaScript when comparing the number 1 with the text “1”. the == operator the !== operator

9626_s22_qp_33

THEORY

2022

Paper 3, Variant 3

View

JavaScript can be used in a web-based form to test whether a number entered by a user matches a certain condition and to select and output an appropriate message. Explain how if else statements are used to do this. The ternary operator could be used instead of if else. Explain why the ternary operator could be used to do this.

9626_s23_qp_32

THEORY

2023

Paper 3, Variant 2

View

JavaScript uses loops to execute a block of code using Iterative methods. Describe what is meant by an Iterative method. Explain how a do/while loop differs from a while loop. Explain why a while loop might be used instead of a for loop in JavaScript code.

9626_s24_qp_31

THEORY

2024

Paper 3, Variant 1

View

JavaScript code has been developed for an interactive website. White box testing is carried out by the developers. Describe how white box testing is used to test the code. Describe one way that JavaScript code can add interactivity to a web page. HTML events occur when users interact with a web page. Describe how JavaScript code can be made to react to an HTML event.

9626_s24_qp_32

THEORY

2024

Paper 3, Variant 2

View

JavaScript uses loops to execute a block of code using Iterative methods. Describe what is meant by an Iterative method. Explain how a do/while loop differs from a while loop. Explain why a while loop might be used instead of a for loop in JavaScript code.

9626_s24_qp_33

THEORY

2024

Paper 3, Variant 3

View

A shop is open between 12 noon and 10 pm. While the shop is closed in the morning, a message saying “Sorry, we are closed” is displayed. After the shop has closed in the evening a message saying “Please try again tomorrow” is displayed. At all other times, a message saying, “Hello, we are open now” is displayed. JavaScript code can be used to alter web pages in real time. Complete the code in the function below that will allow a user to find out if the shop is open or closed. function OpenTimesFunction() { var welcome; var timenow = new Date().getHours(); document.getElementById(“open”).innerHTML = welcome; //This line displays the result of the code }

9626_w17_qp_32

THEORY

2017

Paper 3, Variant 2

View

Describe the advantages of using a web authoring package to create a web page rather than writing HTML code. Describe the disadvantages of using a web authoring package to create a web page rather than writing HTML code.

9626_w18_qp_12

THEORY

2018

Paper 1, Variant 2

View

Quintin is a programmer who writes code in HTML and JavaScript for use in online forms. The code is developed and ‘white-box’ tested before being used. Quintin is developing the code below. He has added comments to the code. The code asks a user to input two numbers and adds the numbers together. It also displays the total and whether or not it is greater than 10. Enter first number: Enter second number: function myaddfunction() { //the next line assigns the first number input to the variable y var y = document.getElementById("nm1").value; //the next line assigns the second number input to the variable z var z = document.getElementById("nm2").value; //the next line adds the two numbers and assigns the result to the variable x var x = +y + +z; //the next line checks if x is greater or not greater than 10 and reports accordingly var A = (x >10) ? x+ " is greater than 10":x+ " is not greater than 10"; //the next line prints the results onto the page document.getElementById("add").innerHTML = A ; } Click the button to calculate the total. Add the numbers Explain how Quintin could use ‘white box’ testing to ensure that the JavaScript code produces the correct result every time. Explain why it is good practice that Quintin places his JavaScript code in external files rather than embeds the code in the actual page code.

9626_w18_qp_32

THEORY

2018

Paper 3, Variant 2

View

JavaScript can be embedded in the code of web pages to add interactivity to a page. Explain what is meant by the following terms when they are used in JavaScript: an array. a variable. a function. a comment. an object. an expression.

9626_w18_qp_33

THEORY

2018

Paper 3, Variant 3

View

JavaScript uses strings to store data. This script is intended to display the contents of three variables on a web page. Line numbers are provided only for your convenience when referring to the code. var statementtxt1 = "It's only me, 'Hardeep'"; var statementtxt2 = "His name is "Peter""; var statementtxt3 = "We call her Jasmine"; document.getElementById( 'names' ).innerHTML = statementtxt1 + "" + statementtxt2 + "" + statementtxt3; Explain, giving reasons, why no output is produced when this JavaScript is executed by a web browser as part of a web page.

9626_w19_qp_32

THEORY

2019

Paper 3, Variant 2

View

---