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| Section | Weight | Objectives |
|---|---|---|
| Asynchronous Programming | 13% | - Asynchronous patterns for business requirements - Promises (creation, chaining, error handling) - Event loop and execution flow - Async/Await syntax - Callbacks |
| Debugging and Error Handling | 7% | - Console methods for debugging - Error handling techniques (try/catch/finally) - Breakpoints and code inspection - Custom error types |
| Browser and Events | 17% | - Browser Developer Tools usage - Interacting with forms and user input - DOM manipulation - Browser-specific APIs - Event handling and listeners - Event propagation (bubbling and capturing) |
| Testing | 7% | - Test coverage and reliability - Writing and modifying unit tests - Test effectiveness evaluation - Unit testing concepts |
| Objects, Functions, and Classes | 25% | - Higher-order functions - Variable scope and closures - ES6 classes and inheritance - Object creation and manipulation - Arrow functions - Execution flow and context - Modules and decorators - Function declarations and expressions - Prototypal inheritance |
| Variables, Types, and Collections | 23% | - Type coercion and conversion - Primitive and complex data types - Arrays and collections - Truthy and falsy evaluations - JSON parsing and manipulation - Variable declarations and initialization - Strings, numbers, and dates |
| Server Side JavaScript | 8% | - Core Node.js modules - Server-side JavaScript implementations - CLI commands - Node.js fundamentals - Package management (npm) |
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NEW QUESTION # 148
Universal Container(UC) just launched a new landing page, but users complain that the
website is slow. A developer found some functions that cause this problem. To verify this, the
developer decides to do everything and log the time each of these three suspicious functions
consumes.
console.time('Performance');
maybeAHeavyFunction();
thisCouldTakeTooLong();
orMaybeThisOne();
console.endTime('Performance');
Which function can the developer use to obtain the time spent by every one of the three
functions?
Answer: B
NEW QUESTION # 149
A developer tries to retrieve all cookies, then sets a certain key value pair in the cookie. These statements are used:
What is the behavior?
Answer: C
NEW QUESTION # 150
JavaScript:
01 function Tiger() {
02 this.type = ' Cat ' ;
03 this.size = ' large ' ;
04 }
05
06 let tony = new Tiger();
07 tony.roar = () = > {
08 console.log( ' They\ ' re great! ' );
09 };
10
11 function Lion() {
12 this.type = ' Cat ' ;
13 this.size = ' large ' ;
14 }
15
16 let leo = new Lion();
17 // Insert code here
18 leo.roar();
Which two statements could be inserted at line 17 to enable line 18?
Answer: A,D
Explanation:
There are two valid ways to ensure leo.roar() exists:
* Directly assign a roar function to leo (Option A). Assigning a property to an instance object creates a new method on that instance.
* leo.roar = () = > { console.log( ' They\ ' re pretty good! ' ); };
After this, calling leo.roar() is valid.
* Copy tony's properties into leo using Object.assign (Option B). Object.assign(target, source) copies enumerable own properties from the source object into the target object. Since tony.roar exists, executing:
* Object.assign(leo, tony);
copies roar into leo, making leo.roar() valid.
Why the other answers are incorrect:
* Option C: Object.assign(leo, Tiger) copies properties from the function object Tiger , not from Tiger.
prototype and not from a Tiger instance. Tiger (the function) has no roar property, so nothing useful is copied.
* Option D: leo.prototype is undefined because leo is an instance, not a constructor function. Only constructor functions have a .prototype property. This line would cause an error.
JavaScript Knowledge References (text-only)
* Instances have their own properties and do not contain a .prototype property.
* Object.assign(target, source) copies own enumerable properties of the source object.
* Assigning a function as a property of an object creates a callable method.
NEW QUESTION # 151
Refer to the code below:
What is the output if this function when called with an empty array?
Answer: A
NEW QUESTION # 152
myArraym can have one level, two levels, or more levels.
Which statement flattens myArray when it can be arbitrarily nested?
Answer: A
NEW QUESTION # 153
......
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