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Salesforce JavaScript Developer Study Guide: Asynchronous JavaScript and DOM Manipulation, Exams of Advanced Education

Liberty University (LU)Advanced Education

This comprehensive study guide provides a deep dive into the essential concepts of asynchronous javascript, focusing on promises, async/await syntax, and event handling. It also covers dom manipulation, including methods for creating, inserting, and manipulating dom elements, as well as working with local storage, geolocation, and browser apis. The guide also covers advanced topics such as closures, generators, decorators, and modules. Ideal for university students and lifelong learners looking to enhance their javascript skills for salesforce development.

Typology: Exams

2023/2024

Available from 04/24/2024

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Salesforce Javascript Developer 1 study
guide complete update
A promise is - CORRECT ANSWER an object returned by asynchronous code
async/await syntax is syntactic sugar for - CORRECT ANSWER promises
the async keyword is added to the front of a - CORRECT ANSWER function that should contain
asynchronous code
the await keyword is added to the front of an asynchronous function call that returns - CORRECT
ANSWER a promise
the insertAfter() method can be used to add an element to the DOM after a given element (T/F) -
CORRECT ANSWER False. There is an insertBefore() method but no insertAfter() method.
A javascript object can be stored in a browser's localStorage using - CORRECT ANSWER JSON.stringify()
What are the additional reload options available via long click in Chrome? - CORRECT ANSWER -
Normal Reload
- Hard Reload
- Empty Cache and Hard Reload
DevTools must be open to access these options.
This method creates a table body - CORRECT ANSWER table.createTBody()
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Download Salesforce JavaScript Developer Study Guide: Asynchronous JavaScript and DOM Manipulation and more Exams Advanced Education in PDF only on Docsity!

Salesforce Javascript Developer 1 study

guide complete update

A promise is - CORRECT ANSWER an object returned by asynchronous code async/await syntax is syntactic sugar for - CORRECT ANSWER promises the async keyword is added to the front of a - CORRECT ANSWER function that should contain asynchronous code the await keyword is added to the front of an asynchronous function call that returns - CORRECT ANSWER a promise the insertAfter() method can be used to add an element to the DOM after a given element (T/F) - CORRECT ANSWER False. There is an insertBefore() method but no insertAfter() method. A javascript object can be stored in a browser's localStorage using - CORRECT ANSWER JSON.stringify() What are the additional reload options available via long click in Chrome? - CORRECT ANSWER - Normal Reload

  • Hard Reload
  • Empty Cache and Hard Reload DevTools must be open to access these options. This method creates a table body - CORRECT ANSWER table.createTBody()

This method inserts a table row - CORRECT ANSWER table.insertRow() What are two ways to listen for events in js? - CORRECT ANSWER - addEventListener()

  • an onevent handler (onclick, onmouseup, etc.) What are the two phases of event propagation in modern browsers? - CORRECT ANSWER - bubbling (goes from target to outermost ancestor)
  • capturing (goes from outermost ancestor to target) How is a custom event created and dispatched? - CORRECT ANSWER 1. CustomEvent() to create
  1. dispatchEvent() to dispatch ex: const myEvent = new customEvent( What objects can addEventListener() target? - CORRECT ANSWER Any object that supports events, including Element, Document, and Window What parameters can be passed to addEventListener()? - CORRECT ANSWER - an options object
  • useCapture (true or false) What are some benefits to using addEventListener()? - CORRECT ANSWER - can use multiple handlers for one event
  • allows controlling phase (bubbling/capturing) when activated

How can elements be retrieved by class or tag name? - CORRECT ANSWER - getElementsByClassName()

  • getElementsByTagName() What method can be used to create a DOM element? - CORRECT ANSWER document.createElement('tag name') What method can be used to add a child node to the end of the list of children of a parent node? - CORRECT ANSWER appendChild() What methods can get and set attributes of a DOM element? - CORRECT ANSWER - getAttribute()
  • setAttribute() What Chrome DevTools panel contains the Watch and Scope panes? - CORRECT ANSWER Sources Where in Chrome DevTools can the styles and classes applied to an element be edited? - CORRECT ANSWER Elements -> Styles What are the three parts of the Sources panel in Chrome DevTools? - CORRECT ANSWER - File Navigator
  • Code Editor
  • Javascript Debugging What browser API can be used to perform crud operations via server requests? - CORRECT ANSWER Fetch What browser APIs can be used to play audio and video? - CORRECT ANSWER Web Audio and WebRTC

What browser API can be used to get the device location? - CORRECT ANSWER Geolocation What browser API can be used to send notifications to the user? - CORRECT ANSWER Notifications What browser API can be used to store data client-side? - CORRECT ANSWER Web Storage What parameters does fetch() take? - CORRECT ANSWER - the path to the resource (required)

  • init, an object which can contain options such as:
    • method
    • headers
    • body
    • mode
    • credentials The fetch() method returns a ______ it can be called using these keywords: _____ - CORRECT ANSWER - promise
  • async / await The Geolocation API can be accessed through a call to - CORRECT ANSWER navigator.geolocation Location information can be accessed using - CORRECT ANSWER - Geolocation.getCurrentPosition() (current location)
  • Geolocation.watchPosition() (execute a function when the location changes) What parameters do Geolocation.getCurrentPosition() and Geolocation.watchPosition() accept? - CORRECT ANSWER - a success callback (required)
  1. set
  2. remove
  3. clear all keys from storage - CORRECT ANSWER 1. Storage.getItem()
  4. Storage.setItem()
  5. Storage.removeItem()
  6. Storage.clear() A cookie is set by - CORRECT ANSWER document.cookie = 'key=value;' Where can local storage, session storage and cookie data be viewed in the Chrome DevTools? - CORRECT ANSWER Application -> Storage Functions can't be nested in js (T/F) - CORRECT ANSWER False What is the difference in the value of the this keyword in traditional vs. arrow functions? - CORRECT ANSWER Traditional: the object that invoked the function, or else the global object Arrow: doesn't default to the global object. The value of this is determined by context A higher order function is - CORRECT ANSWER A function that takes a function as its inputs or creates a function as its output. What is hoisting? - CORRECT ANSWER Hoisting makes it so a function can be called before it is declared. This doesn't happen for function expressions. Closure allows code to - CORRECT ANSWER access its parent scope, even after that code has finished

Give an example of apply(), call() and bind() - CORRECT ANSWER How is a generator function declared? - CORRECT ANSWER function* funcName() {//code here yield value; } a decorator is - CORRECT ANSWER a wrapper function that extends an existing function A class can contain two constructors (T/F) - CORRECT ANSWER False A variable imported from a module can be updated outside of the module (T/F) - CORRECT ANSWER False (there could be functions from the module that update it) What method can be used to prevent an object's properties from being changed? - CORRECT ANSWER Object.freeze(obj) The arguments object of a function contains - CORRECT ANSWER all the values passed to the function in an array-like collection of values, and is only available for non-arrow functions How many parameters are passed to a decorator when it is used to decorate a class? - CORRECT ANSWER 1 Multiple decorators are allowed to be used in classes and class properties (T/F) - CORRECT ANSWER True, and the closest decorator is evaluated first How can a function be exported from a module so that it can be imported with any name? - CORRECT ANSWER export default function functionName()