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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Browsers and Events | 17% | - Document Object Model (DOM) manipulation - Browser APIs and Web Storage - Window and document object properties - Event handling, propagation, and delegation - Script loading and execution order |
| Topic 2: Debugging and Error Handling | 7% | - Error types and exception handling - Console methods and logging - Debugging tools and breakpoints - Defensive programming practices |
| Topic 3: Variables, Types, and Collections | 23% | - Type coercion and conversion rules - Working with strings, numbers, dates, and booleans - Array methods and data manipulation - Variable declaration and initialization - JSON parsing and usage - Truthy and falsy values |
| Topic 4: Asynchronous Programming | 13% | - Async/await syntax - Fetch API and HTTP requests - Promises and chaining - Event loop and micro/macro tasks - Callbacks and callback hell |
| Topic 5: Objects, Functions, and Classes | 25% | - Decorators and advanced function patterns - Function definitions, parameters, and scope - Closures and execution context - Class syntax, inheritance, and prototypes - Object creation, properties, and methods - Modules and imports/exports |
| Topic 6: Server-Side JavaScript | 8% | - Core Node.js modules - Module system and require/import - Command-line tools and scripts - Node.js fundamentals and runtime |
| Topic 7: Testing | 7% | - Testing frameworks and assertions - Unit testing concepts - Test doubles and mocks - Code coverage and best practices |
>> Exam JavaScript-Developer-I Objectives <<
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NEW QUESTION # 36
There is a new requirement for a developer to implement a currPrice method that will return the current price of the item or sales..
What is the output when executing the code above
Answer: A
NEW QUESTION # 37
A developer is setting up a new Node.js server with a client library that is built using events and callbacks.
The library:
Will establish a web socket connection and handle receipt of messages to theserver Will be imported with require, and made available with a variable called we.
The developer also wants to add error logging if a connection fails.
Given this info, which code segment shows the correct way to set up a client with two events that listen at execution time?
Answer: C
NEW QUESTION # 38
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: A
NEW QUESTION # 39
Refer to the code:
01 console.log( ' Start ' );
02 Promise.resolve( ' Success ' ).then(function(value) {
03 console.log( ' Success ' );
04 });
05 console.log( ' End ' );
What is the output after the code executes successfully?
Answer: C
Explanation:
* console.log( ' Start ' ) runs immediately (synchronous).
* Promise.resolve().then(...) places the callback in the microtask queue. The .then handler does not run immediately.
* console.log( ' End ' ) runs next (still synchronous).
* After the synchronous script finishes, the microtask queue runs, logging " Success " .
Execution order:
Start
End
Success
This matches option B .
JavaScript Knowledge References (text-only)
* Promise .then() callbacks execute after the current call stack finishes (microtask queue).
* Synchronous logs run immediately, before promise callbacks.
NEW QUESTION # 40
Referto the code below:
new Promise((resolve, reject) => {
const fraction = Math.random();
if( fraction >0.5) reject("fraction > 0.5, " + fraction);
resolve(fraction);
})
.then(() =>console.log("resolved"))
.catch((error) => console.error(error))
.finally(() =>console.log(" when am I called?"));
When does Promise.finally on line 08 get called?
Answer: A
NEW QUESTION # 41
......
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