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| Section | Weight | Objectives |
|---|---|---|
| Debugging and Error Handling | 7% | - Console methods and logging - Defensive programming practices - Error types and exception handling - Debugging tools and breakpoints |
| Asynchronous Programming | 13% | - Fetch API and HTTP requests - Async/await syntax - Event loop and micro/macro tasks - Callbacks and callback hell - Promises and chaining |
| Testing | 7% | - Unit testing concepts - Test doubles and mocks - Code coverage and best practices - Testing frameworks and assertions |
| Objects, Functions, and Classes | 25% | - Modules and imports/exports - Class syntax, inheritance, and prototypes - Object creation, properties, and methods - Closures and execution context - Decorators and advanced function patterns - Function definitions, parameters, and scope |
| Browsers and Events | 17% | - Document Object Model (DOM) manipulation - Event handling, propagation, and delegation - Window and document object properties - Script loading and execution order - Browser APIs and Web Storage |
| Variables, Types, and Collections | 23% | - Variable declaration and initialization - JSON parsing and usage - Truthy and falsy values - Type coercion and conversion rules - Array methods and data manipulation - Working with strings, numbers, dates, and booleans |
| Server-Side JavaScript | 8% | - Module system and require/import - Core Node.js modules - Command-line tools and scripts - Node.js fundamentals and runtime |
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NEW QUESTION # 64
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, and the test passes.
A different developer made changes to the behavior of sum3 to instead sum only the first two numbers present in the array.
Which two results occur when running this test on the updated sum3 function?
Choose 2 answers
Answer: A,D
NEW QUESTION # 65
Given the JavaScript below:
function onLoad() {
console.log( " Page has loaded! " );
}
Where can the developer see the log statement after loading the page in the browser?
Answer: B
Explanation:
console.log() in browser-side JavaScript writes output to the browser's JavaScript console , which is available in the browser's Developer Tools.
* In a typical browser (Chrome, Firefox, Edge, etc.), you open DevTools and go to the Console tab.
* Any console.log( " Page has loaded! " ); executed in page JavaScript will appear there.
Why A is correct:
* The function onLoad is a client-side function (runs in the browser).
* When it executes, the console.log call goes to the browser's JavaScript console , not the server.
Why the others are incorrect:
* B. On the terminal console running the web server
* That console shows logs from the server-side runtime (e.g., Node.js logs).
* This code is clearly browser-side JavaScript (no Node.js or server context shown).
* Therefore, the output does not appear in the terminal.
* C. In the browser performance tools log
* Performance tools (Timeline, Performance tab, etc.) show metrics about rendering, CPU time, network, etc., not generic console.log messages.
* console.log messages appear in the Console tab, not in performance logs.
* D. On the webpage console log
* There is no built-in concept of a "webpage console log" UI rendered on the page itself by default.
* Unless you explicitly code something to display logs in the DOM, console.log output is not visible on the page, only in Developer Tools.
Therefore, the correct place to see that log is:
The answer: A
JavaScript knowledge / Study Guide references (concept names only, no links):
* Browser Developer Tools - Console tab
* console.log() in client-side JavaScript
* Difference between client-side logs and server-side logs
NEW QUESTION # 66
Refer to the code snippet:
01 let array = [1, 2, 3, 4, 4, 5, 4, 4];
02 for (let i = 0; i < array.length; i++) {
03 if (array[i] === 4) {
04 array.splice(i, 1);
05 i--;
06 }
07 }
What is the value of array after the code executes?
Answer: D
Explanation:
Comprehensive and Detailed Explanation:
The loop removes every 4:
* Start: [1, 2, 3, 4, 4, 5, 4, 4]
* i=0 # 1 (no change)
* i=1 # 2 (no change)
* i=2 # 3 (no change)
* i=3 # 4 # splice removes index 3 # [1,2,3,4,5,4,4], then i-- # 2
* Next loop, i=3 # 4 again # splice # [1,2,3,5,4,4], i-- # 2
* i=3 # 5 (no change)
* i=4 # 4 # splice # [1,2,3,5,4] , i-- # 3
* i=4 # 4 # splice # [1,2,3,5], i-- # 3
* Next i=4, array.length is 4 # loop ends.
All 4s removed, final array: [1, 2, 3, 5].
NEW QUESTION # 67
Cloud Kicks has a class to represent items for sale in an online store, as shown below:
Class Item{
constructor (name, price){
this.name = name;
this.price = price;
}
formattedPrice(){
return 's' + String(this.price);}}
A new business requirement comes in that requests a ClothingItem class that should have all of the properties and methods of the Item class but will also have properties that are specific to clothes.
Which line of code properly declares the clothingItem class such that it inherits from Item?
Answer: B
NEW QUESTION # 68
Refer to the code below:
const pi = 3.1415926;
What is the data type of pi?
Answer: A
Explanation:
In JavaScript, there is only one numeric type for ordinary numbers: number.
* JavaScript number is a double-precision 64-bit binary format (IEEE 754).
* There is no separate float, double, or decimal type in core JavaScript.
So:
typeof pi === ' number ' ;
Hence, the correct answer is:
* A. Number
Options B, C, D are specific numeric types found in other languages (like C, Java, C#), not distinct types in JavaScript.
Study Guide Concepts:
* JavaScript primitive types
* typeof operator and number
* Lack of separate float / double / decimal types in JS
NEW QUESTION # 69
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