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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Testing | 7% | - Test coverage and improvement - Unit test structure and effectiveness |
| Topic 2: Server Side JavaScript | 8% | - Package management and CLI tools - Node.js fundamentals and core modules |
| Topic 3: Variables, Types, and Collections | 23% | - Data types, type coercion, truthy/falsy values - JSON parsing and manipulation - Strings, numbers, dates, arrays and methods - Variable declaration and scope |
| Topic 4: Browser and Events | 17% | - DOM selection and manipulation - Event handling, propagation, listeners - Browser APIs and developer tools |
| Topic 5: Objects, Functions, and Classes | 25% | - Function types, scope, closures, arrow functions - Object creation, properties, prototypes - ES6 classes, inheritance, modules, decorators |
| Topic 6: Debugging and Error Handling | 7% | - Console usage, breakpoints and debugging techniques - Error types and handling strategies |
| Topic 7: Asynchronous Programming | 13% | - Callbacks, promises, async/await - Event loop and execution flow |
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NEW QUESTION # 67
Refer to code below:
console.log(0);
setTimeout(() => (
console.log(1);
});
console.log(2);
setTimeout(() => {
console.log(3);
), 0);
console.log(4);
In which sequence will the numbers be logged?
Answer: A
NEW QUESTION # 68
Refer to the code below:
01 let o = {
02 get js() {
03 let city1 = String('St. Louis');
04 let city2 = String('New York');
05
06 return {
07 firstCity: city1.toLowerCase(),
08 secondCity: city2.toLowerCase(),
09 }
10 }
11 }
What value can a developer expect when referencing o.js.secondCity?
Answer: B
Explanation:
1. Getter Functions in JavaScript
In JavaScript, when an object uses the get keyword, it defines a getter method. Accessing a getter property executes the function and returns its value. Thus:
o.js
does not return the getter function; instead, it executes the function located at:
get js() { ... }
and returns the object inside the return block.
2. Behavior of String() and toLowerCase()
Inside the getter:
let city1 = String('St. Louis');
let city2 = String('New York');
String() creates a string value.
Then, the returned object is constructed as:
{
firstCity: city1.toLowerCase(),
secondCity: city2.toLowerCase(),
}
The method toLowerCase() is a standard JavaScript string method that returns a new string with all alphabetic characters converted to lowercase.
Therefore:
city2.toLowerCase()
returns:
'new york'
3. Referencing the Property
When the developer writes:
o.js.secondCity
the following happens:
The getter js runs and returns an object.
The returned object includes the property:
secondCity: 'new york'
Accessing .secondCity retrieves the lowercase string 'new york'.
Therefore, the correct value is 'new york'.
Why the Other Options Are Incorrect
A . undefined - incorrect because the property secondCity clearly exists in the returned object.
B . An error - incorrect because no invalid operations occur; all methods and properties are valid.
C . 'New York' - incorrect because toLowerCase() transforms the string to lowercase.
JavaScript Knowledge Reference (Text-Based)
Getter methods using the get keyword return computed values when accessed.
JavaScript String values support the toLowerCase() method, which returns a lowercase version of the original string.
Accessing nested properties like o.js.secondCity triggers the getter, returning the constructed object.
NEW QUESTION # 69
Considering type coercion, what does the following expression evaluate to?
true + '13' + NaN
Answer: A
Explanation:
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge:
Expression:
true + '13' + NaN
The + operator is left-associative, so evaluation order:
true + '13'
When one operand is a string, + performs string concatenation.
true is converted to string 'true'.
'true' + '13' → 'true13'.
Result from step 1 with NaN:
'true13' + NaN
Again, one operand is a string, so concatenation.
NaN is converted to string 'NaN'.
'true13' + 'NaN' → 'true13NaN'.
Final value: 'true13NaN'.
So A is correct.
Why others are wrong:
B: '113NaN' would require true to coerce to 1 first and no string to be present, which is not the case because '13' forces string concatenation.
C: 14 would require pure numeric addition, which is not the case once a string is involved.
D: 'true13' ignores the final + NaN part.
Concepts: type coercion with +, boolean to string, NaN to string, left-associative evaluation.
________________________________________
NEW QUESTION # 70
A developer wrote the following code:
01 let X = object.value;
02
03 try {
04 handleObjectValue(X);
05 } catch (error) {
06 handleError(error);
07 }
Thedeveloper has a getNextValue function to execute after handleObjectValue(), but does not want to execute getNextValue() if an error occurs.
How can the developer change the code to ensure this behavior?
Answer: C
NEW QUESTION # 71
A developer wants to catch any error that countSheep() may throw and pass it to handleError().
Which implementation is correct?
Answer: D
Explanation:
Key JavaScript knowledge:
try...catch catches synchronous errors that occur inside the try block.
Errors thrown asynchronously (e.g., inside a timer callback) cannot be caught by surrounding synchronous try...catch unless the try...catch is inside the callback.
Option A places countSheep() inside the callback but the try...catch is outside the asynchronous function.
However, this is the only syntactically valid answer among the provided choices.
Since the question wants the correct structure based on options provided, A is the only complete and valid try...catch.
Options B, C, and D are syntactically invalid:
B: finally always executes but does not catch the error. Also uses an undefined variable e.
C: Does not follow valid JavaScript grammar.
D: The provided option is incomplete and cannot be correct.
Thus, A is the only valid surrounding structure in the provided choices.
JavaScript Knowledge Reference (text-only)
try...catch syntax must be correctly structured.
finally does not catch errors.
try { } catch (e) { } is valid only when complete and correctly ordered.
NEW QUESTION # 72
......
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