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| Section | Weight | Objectives |
|---|---|---|
| Asynchronous Programming | 13% | - Callbacks - Asynchronous patterns for business requirements - Event loop and execution flow - Async/Await syntax - Promises (creation, chaining, error handling) |
| Server Side JavaScript | 8% | - Server-side JavaScript implementations - Core Node.js modules - Node.js fundamentals - CLI commands - Package management (npm) |
| Browser and Events | 17% | - Event propagation (bubbling and capturing) - Event handling and listeners - Browser Developer Tools usage - Browser-specific APIs - DOM manipulation - Interacting with forms and user input |
| Objects, Functions, and Classes | 25% | - Variable scope and closures - Arrow functions - Modules and decorators - Execution flow and context - Higher-order functions - ES6 classes and inheritance - Function declarations and expressions - Prototypal inheritance - Object creation and manipulation |
| Testing | 7% | - Test effectiveness evaluation - Unit testing concepts - Writing and modifying unit tests - Test coverage and reliability |
| Debugging and Error Handling | 7% | - Console methods for debugging - Custom error types - Breakpoints and code inspection - Error handling techniques (try/catch/finally) |
| Variables, Types, and Collections | 23% | - Strings, numbers, and dates - Type coercion and conversion - Arrays and collections - JSON parsing and manipulation - Truthy and falsy evaluations - Primitive and complex data types - Variable declarations and initialization |
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NEW QUESTION # 141
Refer to the code below:
01 < html lang= " en " >
02 < table onclick= " console.log( ' Table log ' ); " >
03 < tr id= " row1 " >
04 < td > Click me! < /td >
05 < /tr >
06 < /table >
07 < script >
08 function printMessage(event) {
09 console.log( ' Row log ' );
10 event.stopPropagation();
11 }
12
13 let elem = document.getElementById( ' row1 ' );
14 elem.addEventListener( ' click ' , printMessage, false);
15 < /script >
16 < /html >
Which code change should be done for the console to log the following when " Click me! " is clicked?
Row log
Table log
Answer: A
Explanation:
Current behavior:
* Clicking < td > triggers the click event on row1, then bubbles up to < table > .
* printMessage runs, logs " Row log " , then event.stopPropagation() stops the event from bubbling to the table.
* So " Table log " never appears.
To allow the table's inline onclick to run after the row handler:
* Remove the propagation stop:
function printMessage(event) {
console.log( ' Row log ' );
// event.stopPropagation(); // remove this
}
Now the event bubbles:
* printMessage logs " Row log " .
* The table's onclick runs, logging " Table log " .
Option A only changes capture/bubble phase but still stops propagation. C does nothing meaningful (stopPropagation takes no arguments). B removes the row handler entirely.
NEW QUESTION # 142
Given the code below:
01 setCurrentUrl();
02 console.log( " The current URL is: " + url);
03
04 function setCurrentUrl() {
05 url = window.location.href;
06 }
What happens when the code executes?
Answer: B
Explanation:
* Inside setCurrentUrl, url is assigned without var, let, or const :
url = window.location.href;
* In non-strict mode, this implicitly creates a global variable url on window.
Execution order:
* setCurrentUrl(); creates/sets global url to window.location.href.
* console.log( " The current URL is: " + url); has access to url in global scope and prints correctly.
Thus:
* url has global scope.
* Line 02 runs without error and logs a valid string.
So B is correct.
NEW QUESTION # 143
Refer to the code below:
Line 05 causes an error.
What are the values of greeting and salutation once code completes?
Answer: B
NEW QUESTION # 144
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: A
NEW QUESTION # 145
Refer to the following array:
Let arr1 = [1, 2, 3, 4, 5];
Which two lines of codes result in a second array, arr2, being created such that arr2 is not a reference to arr1? Choose 2 answers
Answer: B,D
NEW QUESTION # 146
......
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