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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Debugging and Error Handling | 7% | - Logging strategies and debugging techniques - try-catch blocks |
| Topic 2: Server Side JavaScript | 8% | - Modules and file operations - Salesforce API integration - Node.js applications |
| Topic 3: Objects, Functions, and Classes | 25% | - Object creation, properties, and prototypal inheritance - Function declarations, expressions, and arrow functions - ES6 Classes, constructors, methods, and inheritance - Higher-order functions and closures - JavaScript modules (export, import) |
| Topic 4: Asynchronous Programming | 13% | - Promises and async/await - Event loop and asynchronous code execution - Callback patterns |
| Topic 5: Variables, Types, and Collections | 23% | - Type coercion and type conversion - Array manipulation (map, filter, reduce, forEach, find) - Variable declaration (var, let, const, scoping, hoisting) - String manipulation and Date objects - JSON parsing and stringification |
| Topic 6: Testing | 7% | - Unit testing with Jest - Automated testing strategies - Test-driven development principles |
| Topic 7: Browser and Events | 17% | - Browser Developer Tools - Event handling, propagation, bubbling, and capturing - DOM manipulation |
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NEW QUESTION # 135
developer wants to use a module named universalContainersLib and them callfunctions from it.
How should a developer import every function from the module and then call the functions foo and bar ?
Answer: B
NEW QUESTION # 136
A developer uses a parsed JSON string to work with user information as in the block below:
01 const userInformation ={
02 " id " : "user-01",
03 "email" : "user01@universalcontainers.demo",
04 "age" : 25
Which two options access the email attribute in the object?
Choose 2 answers
Answer: A,C
NEW QUESTION # 137
Refer to the following code:
Let sampleText = 'The quick brown fox jumps';
A developer needs to determine if a certainsubstring is part of a string.
Which three expressions return true for the given substring ?
Choose 3 answers
Answer: A,B,C
NEW QUESTION # 138
Refer to the code below
let inArray = [[1,2],[3,4,5]];
which two statements results in the array [1,2,3,4,5]?
choose 2 answer
Answer: B,D
NEW QUESTION # 139
Refer to the code:
01 let car1 = new Promise((_, reject) =>
02 setTimeout(reject, 2000, "Car 1 crashed in"));
03 let car2 = new Promise(resolve =>
04 setTimeout(resolve, 1500, "Car 2 completed"));
05 let car3 = new Promise(resolve =>
06 setTimeout(resolve, 3000, "Car 3 completed"));
07
08 Promise.race([car1, car2, car3])
09 .then(value => {
10 let result = '$(value) the race.';
11 })
12 .catch(err => {
13 console.log("Race is cancelled.", err);
14 });
What is the value of result when Promise.race executes?
Answer: C
Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge Promise.race() returns the result of the first settled promise, whether resolved or rejected.
The promises:
car1 → rejects in 2000 ms
car2 → resolves in 1500 ms
car3 → resolves in 3000 ms
The earliest settled promise is car2 (1500 ms), which resolves with the value:
"Car 2 completed"
Therefore, Promise.race enters the .then() branch with:
value = "Car 2 completed"
Inside the .then():
let result = '$(value) the race.';
This appears to attempt template substitution but uses incorrect syntax.
JavaScript template literals require backticks and ${expression}, for example:
`${value} the race.`
Because the code is incorrect, result is literally the string:
$(value) the race.
However, the question asks:
"What is the value of result when Promise.race executes?"
This refers to the intended value based on which promise wins the race, not the template bug.
The winning value is:
Car 2 completed
So the correct conceptual answer is:
Car 2 completed the race.
________________________________________
JavaScript Knowledge Reference (text-only)
Promise.race() returns the first settled (resolved or rejected) promise.
The earliest resolve here is car2 (1500 ms).
Incorrect template literal syntax does not affect the identity of the winning promise.
NEW QUESTION # 140
......
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