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| Section | Weight | Objectives |
|---|---|---|
| Variables, Types, and Collections | 23% | - Variable declarations and initialization - Arrays and collections - Type coercion and conversion - Truthy and falsy evaluations - JSON parsing and manipulation - Strings, numbers, and dates - Primitive and complex data types |
| Asynchronous Programming | 13% | - Async/Await syntax - Event loop and execution flow - Asynchronous patterns for business requirements - Callbacks - Promises (creation, chaining, error handling) |
| Objects, Functions, and Classes | 25% | - ES6 classes and inheritance - Function declarations and expressions - Execution flow and context - Variable scope and closures - Prototypal inheritance - Object creation and manipulation - Higher-order functions - Modules and decorators - Arrow functions |
| Browser and Events | 17% | - DOM manipulation - Interacting with forms and user input - Event propagation (bubbling and capturing) - Browser-specific APIs - Browser Developer Tools usage - Event handling and listeners |
| Testing | 7% | - Writing and modifying unit tests - Unit testing concepts - Test coverage and reliability - Test effectiveness evaluation |
| Debugging and Error Handling | 7% | - Breakpoints and code inspection - Custom error types - Console methods for debugging - Error handling techniques (try/catch/finally) |
| Server Side JavaScript | 8% | - Node.js fundamentals - Server-side JavaScript implementations - CLI commands - Package management (npm) - Core Node.js modules |
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NEW QUESTION # 17
Given the code below:
01 function Person(name, email) {
02 this.name = name;
03 this.email = email;
04 }
05
06 const john = new Person( ' John ' , ' john@email.com ' );
07 const jane = new Person( ' Jane ' , ' jane@email.com ' );
08 const emily = new Person( ' Emily ' , ' emily@email.com ' );
09
10 let usersList = [john, jane, emily];
Which method can be used to provide a visual representation of the list of users and to allow sorting by the name or email attribute?
Answer: A
Explanation:
We have an array of plain objects:
[
{ name: ' John ' , email: ' john@email.com ' },
{ name: ' Jane ' , email: ' jane@email.com ' },
{ name: ' Emily ' , email: ' emily@email.com ' }
]
We want:
* A "visual representation" of the list.
* Ability to sort by name or email in DevTools.
console.table:
* console.table(data) renders data as a table in most browser devtools and Node consoles that support it.
* Each object becomes a row; properties (name, email) become columns.
* Many DevTools UIs allow:
* Clicking column headers to sort by that column.
* Filtering / viewing in a structured way.
So:
console.table(usersList);
Displays a sortable table of users by name or email. This matches the requirement exactly.
Other options:
* console.group(usersList);
* Starts a console group. The argument is just logged as a line label.
* It does not create a table or sortable view; it just groups subsequent logs.
* console.groupCollapsed(usersList);
* Same grouping behavior, but collapsed by default.
* Again, no table or sortable columns.
* console.info(usersList);
* Logs the array in the console, but as a standard log/info.
* You can expand objects, but there is no table view or built-in column sorting.
Therefore, the correct method is:
The answer: A
Study Guide / Concept References (no links):
* console.table for tabular logging
* console.group and console.groupCollapsed for grouped logs
* console.log / console.info standard logging behavior
* DevTools UI support for sorting columns in console.table
NEW QUESTION # 18
Refer to the code below:
Let inArray =[ [ 1, 2 ] , [ 3, 4, 5 ] ];
Which two statements result in the array [1, 2, 3, 4, 5] ?
Choose 2 answers
Answer: B,D
NEW QUESTION # 19
is below:
<input type="file" onchange="previewFile()">
<img src="" height="200" alt="Image Preview..."/>
The JavaScript portion is:
01 function previewFile(){
02 const preview = document.querySelector('img');
03 const file = document.querySelector('input[type=file]').files[0];
04 //line 4 code
05 reader.addEventListener("load", () => {
06 preview.src = reader.result;
07 },false);
08 //line 8 code
09 }
In lines 04 and 08, which code allows the user to select an image from their local computer , and to display the image in the browser?
Answer: C
NEW QUESTION # 20
A developer creates a simple webpage with an input field. When a user enters text in the input field and clicks the button, the actual value of the field must be displayed in the console.
Here is the HTML file content:
<input type =" text" value="Hello" name ="input">
<button type ="button" >Display </button> The developer wrote the javascript code below:
Const button = document.querySelector('button');
button.addEvenListener('click', () => (
Const input = document.querySelector('input');
console.log(input.getAttribute('value'));
When the user clicks the button, the output is always "Hello".
What needs to be done to make this code work as expected?
Answer: B
NEW QUESTION # 21
Refer to the code snippet below:
Let array = [1, 2, 3, 4, 4, 5, 4, 4];
For (let i =0; i < array.length; i++)
if (array[i] === 4) {
array.splice(i, 1);
}
}
What is the value of array after the code executes?
Answer: B
Explanation:
NEW QUESTION # 22
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