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JAVASCRIPT SALES FORCE DEVELOPER 1 Exam Questions and Answers Latest Graded A+, Exams of Javascript programming

Stanford UniversityJavascript programming

JAVASCRIPT SALES FORCE DEVELOPER 1 Exam Questions and Answers Latest Graded A+

Typology: Exams

2025/2026

Available from 05/18/2026

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JAVASCRIPT SALES FORCE DEVELOPER 1 Exam Questions and
Answers Latest Graded A+
1. Which of the following is NOT a valid data type in JavaScript?
a) String
b) Integer
c) Decimal
d) Blob - ✔✔Answer: d) Blob
Explanation: Blob is not a native JavaScript data type. It's used in Salesforce to represent binary data.
2. What is the purpose of the event.preventDefault() method in a JavaScript event handler?
a) To define a new event
b) To cancel the default behavior of an event
c) To access event data
d) To trigger another event - ✔✔Answer: b) To cancel the default behavior of an event
Explanation: This method prevents the browser's default action associated with an event, allowing for
custom behavior in your code.
3. How can you iterate over the elements of an array in JavaScript?
a) Using a for loop
b) Using a while loop
c) Using the each method (not standard JavaScript)
d) There's no built-in way to iterate over arrays - ✔✔Answer: a) Using a for loop
Explanation: The for loop is the standard way to iterate over each element in an array.
4. What is the syntax for defining a function in JavaScript?
a) function name(parameters) { code }
b) define function name(parameters) { code }
c) var function name(parameters) { code }
d) createFunction name(parameters) { code } - ✔✔Answer: a) function name(parameters) { code }
Explanation: The provided syntax is the correct way to define a function in JavaScript.
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JAVASCRIPT SALES FORCE DEVELOPER 1 Exam Questions and

Answers Latest Graded A+

  1. Which of the following is NOT a valid data type in JavaScript? a) String b) Integer c) Decimal d) Blob - ✔✔Answer: d) Blob Explanation: Blob is not a native JavaScript data type. It's used in Salesforce to represent binary data.
  2. What is the purpose of the event.preventDefault() method in a JavaScript event handler? a) To define a new event b) To cancel the default behavior of an event c) To access event data d) To trigger another event - ✔✔Answer: b) To cancel the default behavior of an event Explanation: This method prevents the browser's default action associated with an event, allowing for custom behavior in your code.
  3. How can you iterate over the elements of an array in JavaScript? a) Using a for loop b) Using a while loop c) Using the each method (not standard JavaScript) d) There's no built-in way to iterate over arrays - ✔✔Answer: a) Using a for loop Explanation: The for loop is the standard way to iterate over each element in an array.
  4. What is the syntax for defining a function in JavaScript? a) function name(parameters) { code } b) define function name(parameters) { code } c) var function name(parameters) { code } d) createFunction name(parameters) { code } - ✔✔Answer: a) function name(parameters) { code } Explanation: The provided syntax is the correct way to define a function in JavaScript.
  1. How do you access the value of a Visualforce variable within a JavaScript controller? a) Directly using the variable name b) Using the {!varName} syntax c) Using the $Component.getVariable("varName") method d) Visualforce variables are not accessible in JavaScript controllers - ✔✔Answer: b) Using the {!varName} syntax Explanation: The {!varName} syntax allows you to access Visualforce variables within JavaScript controllers.
  2. What is the difference between == and === operators in JavaScript? a) There's no difference, they both compare for equality b) == performs loose comparison, === performs strict comparison c) == is used for assignment, === is used for comparison d) == compares values, === compares values and types - ✔✔Answer: b) == performs loose comparison, === performs strict comparison Explanation: == performs loose comparison, which may convert data types before comparison. === performs strict comparison, ensuring both value and data type are identical.
  3. How can you trigger a Lightning component event from a JavaScript controller? a) Using the fireEvent method on the component object b) By calling the event handler directly c) Using a custom JavaScript function d) Events cannot be triggered from controllers - ✔✔Answer: b) By calling the event handler directly Explanation: You can trigger a Lightning component event from a controller by calling the event handler function directly.
  4. What is the purpose of the Apex.execute method in JavaScript? a) To perform server-side calculations b) To call Apex methods from JavaScript c) To access Salesforce data

b) By prefixing the variable name with an underscore c) There's no way to prevent reassignment d) Using the const keyword - ✔✔Answer: d) Using the const keyword Explanation: The const keyword declares a variable that cannot be reassigned after its initial value is set.

  1. What is the purpose of the window.location object in JavaScript? a) To manipulate browser history b) To access and modify the current URL c) To manage browser window size and position d) To interact with browser cookies - ✔✔Answer: b) To access and modify the current URL Explanation: The window.location object provides properties and methods for getting and modifying the current URL.
  2. How can you sort an array of objects based on a specific property in JavaScript? a) Using a custom sorting function with the sort method b) There's no built-in way to sort objects in arrays c) Using a separate loop to iterate and sort d) Using the orderBy method (not standard JavaScript) - ✔✔Answer: a) Using a custom sorting function with the sort method Explanation: The sort method can be used with a custom function to compare objects based on specific properties.
  3. What is the difference between synchronous and asynchronous code execution in JavaScript? a) Synchronous code waits for tasks to finish before continuing, asynchronous doesn't wait b) Synchronous code deals with numbers, asynchronous code deals with strings c) Synchronous code is faster, asynchronous code is slower d) There's no practical difference - ✔✔Answer: a) Synchronous code waits for tasks to finish before continuing, asynchronous doesn't wait Explanation: Synchronous code executes line by line, waiting for one task to finish before moving on. Asynchronous code allows other tasks to run concurrently without blocking the main thread.

1 6. How can you debounce a function call in JavaScript? a) By wrapping the function in a setTimeout call b) By using a custom function that tracks the last call time c) There's no built-in way to debounce functions d) Debouncing is not relevant in JavaScript - ✔✔Answer: b) By using a custom function that tracks the last call time Explanation: Debouncing ensures a function doesn't execute multiple times in rapid succession. You can achieve this with a custom function that tracks the last call time and delays subsequent calls until a certain time has passed.

  1. What is 'this' keyword in JavaScript and how does it work within event handlers? a) this refers to the window object by default b) this refers to the element the event handler is attached to c) this is undefined within event handlers d) this refers to the function itself - ✔✔Answer: b) this refers to the element the event handler is attached to Explanation: Within event handlers, 'this' keyword typically refers to the DOM element that triggered the event.
  2. How can you chain method calls in JavaScript? a) By using separate variables for each method call b) By calling methods one after another on the same object c) Chaining is not possible in JavaScript d) Using a loop to iterate through methods - ✔✔Answer: b) By calling methods one after another on the same object Explanation: Chaining allows you to call multiple methods on the same object sequentially, improving code readability.
  3. What is the difference between GET and POST HTTP methods? a) GET retrieves data, POST submits data b) GET is faster, POST is slower c) GET is more secure, POST is less secure

a) By wrapping the code that might throw errors in a try block and defining error handling in a catch block b) Using an if statement to check for errors c) There's no built-in way to handle errors in JavaScript d) Errors automatically display an alert message - ✔✔Answer: a) By wrapping the code that might throw errors in a try block and defining error handling in a catch block Explanation: try...catch blocks allow you to define code that might throw errors within the try block and handle those errors gracefully using the catch block.

  1. What is the difference between primitive data types and reference data types in JavaScript? a) Primitive data types are stored by reference, reference data types are stored by value b) Primitive data types are simple values, reference data types hold complex data structures c) There's no meaningful difference d) Primitive data types are slower to access - ✔✔Answer: a) Primitive data types are stored by reference, reference data types are stored by value Explanation: Primitive data types (like numbers, strings) hold the actual value. Reference data types (like objects, arrays) store a reference to the memory location where the actual data resides.
  2. How can you iterate over the properties of an object in JavaScript? a) Using a for loop with the object name b) Using the Object.keys method to get an array of keys and then looping through them c) There's no built-in way to iterate over object properties d) Using a for...of loop (not recommended for objects) - ✔✔Answer: b) Using the Object.keys method to get an array of keys and then looping through them Explanation: The Object.keys method returns an array of an object's property names, which you can then use to iterate through the properties.
  3. What is the document.querySelector method used for in JavaScript? a) To select the first element matching a CSS selector b) To select all elements matching a CSS selector c) To manipulate the DOM structure d) To add event listeners to elements - ✔✔Answer: a) To select the first element matching a CSS selector

Explanation: document.querySelector selects the first element that matches a specified CSS selector within the document.

  1. How can you prevent default form submission behavior in JavaScript? a) By modifying the form element's action attribute b) By calling the preventDefault method on the event object within the form's submit event handler c) There's no way to prevent default form submission d) Using a confirmation dialog before form submission - ✔✔Answer: b) By calling the preventDefault method on the event object within the form's submit event handler Explanation: Calling preventDefault on the event object within the form's submit event handler stops the browser's default form submission behavior.
  2. What is the purpose of the window.addEventListener method in JavaScript? a) To attach an event listener to a DOM element b) To trigger a specific DOM event c) To access information about the current window d) To manipulate browser window dimensions - ✔✔Answer: a) To attach an event listener to a DOM element Explanation: window.addEventListener allows you to attach an event listener to a DOM element, defining a function to execute when that event occurs.
  3. What is the DOM (Document Object Model) in JavaScript and how is it used? a) A database for storing web page content b) A representation of an HTML document as a tree structure, allowing manipulation of web page content c) A way to style web pages using CSS d) A method for fetching data from external APIs - ✔✔Answer: b) A representation of an HTML document as a tree structure, allowing manipulation of web page content Explanation: The DOM is a programming interface that represents an HTML document as a tree of objects. This structure allows JavaScript to access, modify, and interact with the various elements and content of the web page.
  4. How can you create a custom JavaScript module and export functions or variables for use in other parts of your code?