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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Testing | 7% | - Test coverage and reliability - Test effectiveness evaluation - Writing and modifying unit tests - Unit testing concepts |
| Topic 2: Server Side JavaScript | 8% | - Node.js fundamentals - CLI commands - Server-side JavaScript implementations - Package management (npm) - Core Node.js modules |
| Topic 3: Objects, Functions, and Classes | 25% | - Arrow functions - ES6 classes and inheritance - Execution flow and context - Function declarations and expressions - Prototypal inheritance - Higher-order functions - Variable scope and closures - Object creation and manipulation - Modules and decorators |
| Topic 4: Browser and Events | 17% | - Event propagation (bubbling and capturing) - DOM manipulation - Browser-specific APIs - Interacting with forms and user input - Browser Developer Tools usage - Event handling and listeners |
| Topic 5: Variables, Types, and Collections | 23% | - Variable declarations and initialization - Strings, numbers, and dates - Type coercion and conversion - Arrays and collections - JSON parsing and manipulation - Truthy and falsy evaluations - Primitive and complex data types |
| Topic 6: Debugging and Error Handling | 7% | - Breakpoints and code inspection - Console methods for debugging - Error handling techniques (try/catch/finally) - Custom error types |
| Topic 7: Asynchronous Programming | 13% | - Async/Await syntax - Callbacks - Asynchronous patterns for business requirements - Promises (creation, chaining, error handling) - Event loop and execution flow |
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NEW QUESTION # 134
Refer to the code snippet:
Function getAvailabilityMessage(item) {
If (getAvailability(item)){
Var msg ="Username available";
}
Return msg;
}
A developer writes this code to return a message to user attempting to register a new username. If the username is available, variable.
What is the return value of msg hen getAvailabilityMessage ("newUserName" ) is executed and getAvailability("newUserName") returns false?
Answer: D
NEW QUESTION # 135
Refer to the code below:
const car = {
price:100,
getPrice:function(){
return this.price;
}
};
const customCar = Object.create(car);
customCar.price = 70;
delete customCar.price;const result = customCar.getPrice();
What is the value of result after the code executes?
Answer: B
NEW QUESTION # 136
A developer wants to leverage a module to print a price in pretty format, and has imported a method as shown below:
Import printPrice from '/path/PricePrettyPrint.js';
Based on the code, what must be true about the printPrice function of the PricePrettyPrint module for this import to work ?
Answer: A
NEW QUESTION # 137
A developer is asked to fix some bugs reported by users. To do that, the developer adds a breakpoint for debugging.
01 function Car(maxSpeed, color) {
02 this.maxSpeed = maxSpeed;
03 this.color = color;
04 }
05 let carSpeed = document.getElementById( ' carSpeed ' );
06 debugger;
07 let fourWheels = new Car(carSpeed.value, ' red ' );
When the code execution stops at the breakpoint on line 06, which two types of information are available in the browser console?
Answer: A,D
Explanation:
When execution hits the debugger; statement on line 06, JavaScript execution pauses at that point. Most modern browsers (for example, using DevTools) allow you to inspect the current scope , DOM, and various browser APIs in the console.
Let's look at what is available precisely at line 06.
Current code state at the breakpoint:
* Lines 01-04 define the Car constructor function.
* Line 05 executes:
* let carSpeed = document.getElementById( ' carSpeed ' );
So at line 06:
* carSpeed is a variable containing a reference to a DOM element (the element with id " carSpeed " ).
* Line 07 has not executed yet:
* let fourWheels = new Car(carSpeed.value, ' red ' );
So fourWheels has not been created and is not accessible yet (it is in the temporal dead zone for the let declaration).
Now check each option:
Option A:
" A variable displaying the number of instances created for the Car object "
* This code does not implement any mechanism to count instances of Car.
* There is no static property, global counter, or similar variable tracking the number of Car instances.
* At line 06, no instance of Car has even been created yet (new Car(...) is on line 07, which has not run).
* Therefore, there is no such variable by default in JavaScript or DevTools.
This option is not available.
Option B:
" The information stored in the window.localStorage property "
* At a breakpoint, the console is fully usable to inspect global objects.
* window.localStorage is always accessible from the console (assuming standard browser context).
* You can type:
* window.localStorage
and inspect key/value pairs stored there.
* This is independent of the current function or breakpoint line; localStorage is part of the Web Storage API on the window object.
So this information is indeed available in the console at line 06.
Option C:
" The values of the carSpeed and fourWheels variables "
* At line 06:
* carSpeed has been declared and assigned (line 05), so it is available, and its value (a DOM element) can be inspected.
* fourWheels is declared on line 07 with let and has not yet been executed.
* Variables declared with let and const are in a temporal dead zone before their declaration line completes.
* At line 06, fourWheels is not yet initialized, and attempting to access it would result in a ReferenceError.
Thus, you can inspect carSpeed but not fourWheels. The option explicitly says " the values of the carSpeed and fourWheels variables " , which is not correct at this breakpoint, because fourWheels is not available yet.
Option D:
" The style, event listeners and other attributes applied to the carSpeed DOM element "
* carSpeed holds a reference to a DOM element (document.getElementById( ' carSpeed ' )).
* In DevTools, you can inspect this element in several ways:
* Typing carSpeed in the console.
* Inspecting it in the Elements panel.
* From the console or Elements panel, you can view:
* Its style (inline styles and computed styles).
* Event listeners attached to it (using event listener viewer in DevTools).
* Other attributes (id, class, etc.).
All of this is accessible at the point where execution is paused.
Therefore, this information is available at the breakpoint.
Conclusion:
* B is available (global window.localStorage).
* D is available (full inspection of the carSpeed DOM element).
* A is not present in this code or environment.
* C is partially wrong (only carSpeed exists; fourWheels does not yet).
So the two correct answers are:
The answer: B, D
References of JavaScript knowledge documents or Study Guide (concept names only):
* debugger statement and pausing execution
* JavaScript execution context and scope at a breakpoint
* let declarations and temporal dead zone
* Browser DevTools console and inspection of variables
* DOM access via document.getElementById and inspection of elements
* Web Storage API: window.localStorage
NEW QUESTION # 138
Refer to the code below:
Let str = 'javascript';
Str[0] = 'J';
Str[4] = 'S';
After changing the string index values, the value of str is 'javascript'. What is the reason for this value:
Answer: C
NEW QUESTION # 139
......
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