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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Variables, Types, and Collections | 23% | - Array methods and data manipulation - Truthy and falsy values - JSON parsing and usage - Working with strings, numbers, dates, and booleans - Type coercion and conversion rules - Variable declaration and initialization |
| Topic 2: Objects, Functions, and Classes | 25% | - Closures and execution context - Class syntax, inheritance, and prototypes - Decorators and advanced function patterns - Function definitions, parameters, and scope - Object creation, properties, and methods - Modules and imports/exports |
| Topic 3: Debugging and Error Handling | 7% | - Console methods and logging - Debugging tools and breakpoints - Error types and exception handling - Defensive programming practices |
| Topic 4: Browsers and Events | 17% | - Window and document object properties - Script loading and execution order - Document Object Model (DOM) manipulation - Event handling, propagation, and delegation - Browser APIs and Web Storage |
| Topic 5: Server-Side JavaScript | 8% | - Node.js fundamentals and runtime - Command-line tools and scripts - Core Node.js modules - Module system and require/import |
| Topic 6: Testing | 7% | - Code coverage and best practices - Unit testing concepts - Test doubles and mocks - Testing frameworks and assertions |
| Topic 7: Asynchronous Programming | 13% | - Event loop and micro/macro tasks - Fetch API and HTTP requests - Callbacks and callback hell - Async/await syntax - Promises and chaining |
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NEW QUESTION # 111
Refer to the following array:
Let arr1 = [ 1, 2, 3, 4, 5 ];
Which two lines of code result in a second array, arr2 being created such that arr2 is not a reference to arr1?
Answer: B,D
NEW QUESTION # 112
Refer to the code below:
For (let number =2: number <= S; number += 1) ( // insert code statement here The developer needs to insert a code statement in the location shown. The code statement has these requirements:
1. Does not require an import
2. Logs an error when the Boolean statement evaluates to false
3. Works In both the browser and Node.js
Which statement meet these requirements?
Answer: B
NEW QUESTION # 113
developer uses the code below to format a date.
After executing, what is the value of formattedDate?
Answer: D
NEW QUESTION # 114
Refer to the code below:
01 const myFunction = arr = > {
02 return arr.reduce((result, current) = > {
03 return result + current;
04 }, 10);
05 }
What is the output of this function when called with an empty array?
Answer: B
Explanation:
We call:
myFunction([]);
Inside:
arr.reduce((result, current) = > {
return result + current;
}, 10);
Key points about Array.prototype.reduce:
* Signature: array.reduce(callback, initialValue)
* If initialValue is provided and the array is empty , reduce:
* Does not call the callback at all.
* Simply returns initialValue.
Here:
* arr is [] (empty).
* initialValue is 10.
So:
* No iterations of the callback happen (no elements to process).
* The return value is the initial value: 10.
So the actual output is:
myFunction([]) === 10;
Among the options:
* A: 0 - incorrect, because the initial value is 10, not 0.
* B: Throws an error - reduce throws only if the array is empty and there is no initialValue. Here we have an initial value, so no error.
* C: NaN - there is no arithmetic with undefined or invalid values; we just return 10.
* D: Returns 5 - the numeric value given is wrong; the correct value is 10.
Given the logic, the correct conceptual result is 10 . The option text "Returns 5" is almost certainly a typo for "Returns 10". Since the letter that is intended to represent the correct behavior is D, we keep:
The answer: D
Study Guide / Concept References (no links):
* Array.prototype.reduce behavior with initialValue
* Behavior of reduce on an empty array with and without initialValue
* Return value when no iterations run
NEW QUESTION # 115
Refer to the following code:
< html lang= " en " >
< body >
< button class= " secondary " > Save draft < /button >
< button class= " primary " > Save and close < /button >
< /body >
< script >
function displaySaveMessage(event) {
console.log( ' Save message. ' );
}
function displaySuccessMessage(event) {
console.log( ' Success message. ' );
}
window.onload = function() {
document.querySelector( ' .secondary ' )
.addEventListener( ' click ' , displaySaveMessage, true);
document.querySelector( ' .primary ' )
.addEventListener( ' click ' , displaySuccessMessage, true);
}
< /script >
< /html >
Answer: D
Explanation:
The answer choices appear to belong to an event propagation question using nested elements such as an outer element and an inner element.
The important clue is this third argument:
addEventListener( ' click ' , handlerFunction, true);
When the third argument is true, the event listener runs during the capturing phase .
In event capturing, the browser handles the event from the outside toward the inside:
Outer element # Inner element
So, if an inner element is clicked and both the outer and inner elements have click listeners registered with capture mode set to true, the outer listener runs first, then the inner listener runs.
That produces:
Outer message
Inner message
So the matching option is B .
Important correction:
In the exact code shown, the buttons are sibling elements:
< button class= " secondary " > Save draft < /button >
< button class= " primary " > Save and close < /button >
They are not nested inside one another. Therefore, with the code exactly as written:
Clicking the secondary button logs:
Save message.
Clicking the primary button logs:
Success message.
However, because the provided answer choices refer to Outer message and Inner message , the intended concept is clearly event capturing. In a capturing-phase question with nested outer and inner elements, the correct order is:
Outer message
Inner message
Therefore, the verified answer for the intended event-capturing question is B .
NEW QUESTION # 116
......
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