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| Section | Weight | Objectives |
|---|---|---|
| Objects, Functions, and Classes | 25% | - Object creation, properties, prototypes - Function types, scope, closures, arrow functions - ES6 classes, inheritance, modules, decorators |
| Asynchronous Programming | 13% | - Event loop and execution flow - Callbacks, promises, async/await |
| Debugging and Error Handling | 7% | - Console usage, breakpoints and debugging techniques - Error types and handling strategies |
| Server Side JavaScript | 8% | - Package management and CLI tools - Node.js fundamentals and core modules |
| Variables, Types, and Collections | 23% | - JSON parsing and manipulation - Variable declaration and scope - Strings, numbers, dates, arrays and methods - Data types, type coercion, truthy/falsy values |
| Browser and Events | 17% | - Browser APIs and developer tools - Event handling, propagation, listeners - DOM selection and manipulation |
| Testing | 7% | - Test coverage and improvement - Unit test structure and effectiveness |
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NEW QUESTION # 108
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 # 109
Refer to the code below:
01 let timedFunction = () => {
02 console.log('Timer called.');
03 };
04
05 let timerId = setInterval(timedFunction, 1000);
Which statement allows a developer to cancel the scheduled timed function?
Answer: B
Explanation:
Comprehensive and Detailed Explanation From JavaScript Knowledge:
The code:
let timerId = setInterval(timedFunction, 1000);
setInterval schedules timedFunction to run every 1000 ms.
It returns an interval ID (here stored in timerId), which is used to cancel the interval later.
To cancel:
Use clearInterval(timerId);
This is the standard browser (and Node.js) API:
let id = setInterval(fn, delay);
clearInterval(id); stops future executions of that interval.
Check other options:
B . removeInterval(timerId);
There is no removeInterval function in the standard JavaScript timer API.
C . removeInterval(timedFunction);
Again, no such function; and timers are cancelled by ID, not by the callback function reference.
D . clearInterval(timedFunction);
clearInterval expects the ID returned by setInterval, not the callback function.
Passing the function does not cancel the timer.
Therefore, the correct statement is:
Answe r: A
Study Guide / Concept Reference (no links):
Timer APIs: setInterval and clearInterval
Relationship between timer ID and cancellation
Difference between interval ID and callback function
Basic async timing patterns in JavaScript
NEW QUESTION # 110
A developer needs to debug a Node.js web server because a runtime error keeps occurring at one of the endpoints.
The developer wants to test the endpoint on a local machine and make the request against a local server to look at the behavior. In the source code, the server, js file will start the server. the developer wants to debug the Node.js server only using the terminal.
Which command can the developer use to open the CLI debugger in their current terminal window?
Answer: B
NEW QUESTION # 111
Refer to HTML below:
<p> The current status of an Order: <span id ="status"> In Progress </span></p>.
Which JavaScript statement changes thetext 'In Progress' to 'Completed' ?
Answer: B
NEW QUESTION # 112
Refer to the code below:
Let textValue = '1984';
Which code assignment shows a correct way to convert this string to an integer?
Answer: C
NEW QUESTION # 113
......
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