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| Section | Weight | Objectives |
|---|---|---|
| Debugging and Error Handling | 7% | - Error types and handling strategies - Console usage, breakpoints and debugging techniques |
| Browser and Events | 17% | - Browser APIs and developer tools - Event handling, propagation, listeners - DOM selection and manipulation |
| Asynchronous Programming | 13% | - Callbacks, promises, async/await - Event loop and execution flow |
| 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 |
| Objects, Functions, and Classes | 25% | - ES6 classes, inheritance, modules, decorators - Object creation, properties, prototypes - Function types, scope, closures, arrow functions |
| Server Side JavaScript | 8% | - Node.js fundamentals and core modules - Package management and CLI tools |
| Testing | 7% | - Unit test structure and effectiveness - Test coverage and improvement |
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NEW QUESTION # 86
A developer is working on an ecommerce website where the delivery date is dynamically calculated based on the current day. The code line below is responsible for this calculation.
Const deliveryDate = new Date ();
Due to changes in the business requirements, the delivery date must now be today's date + 9 days.
Which code meets thisnew requirement?
Answer: B
NEW QUESTION # 87
Refer to the code below:
01 new Promise((resolve, reject) => {
02 const fraction = Math.random();
03 if (fraction > 0.5) reject('fraction > 0.5, ' + fraction);
04 resolve(fraction);
05 })
06 .then(() => console.log('resolved'))
07 .catch((error) => console.error(error))
08 .finally(() => console.log('when am I called?'));
When does Promise.finally on line 08 get called?
Answer: D
Explanation:
Comprehensive and Detailed Explanation From Exact Extract JavaScript knowledge:
Behavior of Promise.prototype.finally:
.finally(handler) registers a callback that runs when the promise is settled, meaning:
Either fulfilled (resolved), or
rejected.
Important points:
The finally callback does not receive the promise's value or error (unlike then and catch).
It is executed after the promise is settled, but before the resolution value or rejection reason is passed further down the chain.
It runs in both success and failure paths.
In the given code:
The promise may either:
Call reject('fraction > 0.5, ' + fraction) if fraction > 0.5, or
Call resolve(fraction) otherwise.
In both cases:
If it resolves, .then(() => console.log('resolved')) runs, and then .finally(...) is executed.
If it rejects, .catch((error) => console.error(error)) runs, and then .finally(...) is executed.
So .finally runs:
Not just "when rejected".
Not just "when resolved".
But whenever the promise is resolved or rejected.
Therefore, the correct choice is:
D . When resolved or rejected.
NEW QUESTION # 88
Given the code below:
Setcurrent URL ();
console.log('The current URL is: ' +url );
functionsetCurrentUrl() {
Url = window.location.href:
What happens when the code executes?
Answer: B
NEW QUESTION # 89
A developer wrote the following code to test a sum3 function that takes in an array of numbers and returns the sum of the first three numbers in the array. The test passes:
01 let res = sum3([1, 2, 3]);
02 console.assert(res === 6);
03
04 res = sum3([1, 2, 3, 4]);
05 console.assert(res === 6);
A different developer made changes to the behavior of sum3 to instead sum all of the numbers present in the array.
Which two results occur when running the test on the updated sum3 function?
Answer: C,D
Explanation:
New behavior: sum3 now returns the sum of all elements.
Line 01: sum3([1, 2, 3]) → 1 + 2 + 3 = 6
Assertion on line 02: res === 6 → passes.
Line 04: sum3([1, 2, 3, 4]) → 1 + 2 + 3 + 4 = 10
Assertion on line 05: res === 6 → 10 === 6 is false, so the assertion fails.
So:
Line 02 assertion passes → D.
Line 05 assertion fails → C.
NEW QUESTION # 90
Which actions can be done using the JavaScript browser console?
Answer: C
Explanation:
The correct answer is B because the JavaScript browser console allows developers to interact with the current web page using JavaScript commands. Through the console, you can access the document object, inspect DOM elements, read their properties, and modify the structure or content of the page.
For example:
document.body.style.backgroundColor = "lightblue";
This changes the page's background color.
Another example:
document.querySelector("h1").textContent = "Updated Heading";
This changes the text of the first <h1> element on the page.
The DOM, or Document Object Model, is the browser's JavaScript representation of the HTML page. Since the console runs JavaScript in the context of the current page, it can be used to inspect and modify DOM elements directly.
Why the other options are incorrect:
A is not the best answer because although you can type general JavaScript expressions in the console, the browser console is mainly connected to the current page's execution environment. The question is asking about practical browser-console actions related to a page.
C is incorrect because performance reports are usually generated through tools such as the Performance panel or Lighthouse in browser developer tools, not directly through the JavaScript console.
D is incorrect because the console can modify the DOM and runtime values, but it does not permanently change the original JavaScript source code of the page. Any changes made through the console are temporary and disappear when the page reloads.
E is incorrect because security-protected cookies, such as HttpOnly cookies, cannot be viewed or changed using JavaScript. This is an intentional browser security feature that prevents client-side scripts from accessing sensitive cookie data.
Therefore, the best verified answer is B.
NEW QUESTION # 91
......
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