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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Variables, Types, and Collections | 23% | - String manipulation and Date objects - Type coercion and type conversion - Array manipulation (map, filter, reduce, forEach, find) - Variable declaration (var, let, const, scoping, hoisting) - JSON parsing and stringification |
| Topic 2: Objects, Functions, and Classes | 25% | - Function declarations, expressions, and arrow functions - Object creation, properties, and prototypal inheritance - JavaScript modules (export, import) - Higher-order functions and closures - ES6 Classes, constructors, methods, and inheritance |
| Topic 3: Asynchronous Programming | 13% | - Event loop and asynchronous code execution - Callback patterns - Promises and async/await |
| Topic 4: Server Side JavaScript | 8% | - Salesforce API integration - Modules and file operations - Node.js applications |
| Topic 5: Testing | 7% | - Test-driven development principles - Automated testing strategies - Unit testing with Jest |
| Topic 6: Browser and Events | 17% | - Event handling, propagation, bubbling, and capturing - DOM manipulation - Browser Developer Tools |
| Topic 7: Debugging and Error Handling | 7% | - try-catch blocks - Logging strategies and debugging techniques |
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NEW QUESTION # 58
01 function Monster() { this.name = 'hello'; };
02 const m = Monster();
What happens due to the missing new keyword?
Answer: C
Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge In JavaScript, when calling a constructor function without new:
const m = Monster();
the following happens:
The function executes as a normal function, not as a constructor.
Inside a regular function (in non-strict mode), this refers to the global object:
In a browser: window
So the line:
this.name = 'hello';
becomes:
window.name = 'hello';
Since Monster() does not return anything, its return value is undefined:
const m = undefined;
Therefore:
m is undefined
window.name becomes "hello"
This matches option B.
________________________________________
JavaScript Knowledge Reference (text-only)
Calling a function without new uses the global object as this in non-strict mode.
Constructor functions must use new to create a new object.
Functions without an explicit return return undefined.
NEW QUESTION # 59
Refer to the code:
01 const event = new CustomEvent(
02 // Missing code
03 );
04 obj.dispatchEvent(event);
A developer needs to dispatch a custom event called update to send information about recordId.
Which two options can be inserted at line 02?
Answer: A,C
Explanation:
The correct constructor signature for CustomEvent is:
new CustomEvent(eventName, optionsObject)
Where:
eventName is a string.
optionsObject may include:
detail → used to pass custom data
bubbles
cancelable, etc.
Example:
new CustomEvent('update', {
detail: { recordId: '123abc' }
});
Now evaluate each option:
Option A
{ type: 'update', recordId: '123abc' }
Incorrect: The constructor requires (eventName, options), not a single object. type is not used this way.
Option B
'update', { detail: { recordId: '123abc' } }
Correct format. detail is the proper place for custom event data.
Option C
'update', '123abc'
Incorrect: The second argument must be an object (options), not a string.
Option D
'update', { recordId: '123abc' }
Acceptable because any extra properties on the options object are still allowed, even though best practice is to use detail.
This still creates a valid CustomEvent, and the event will dispatch successfully.
Thus the two correct answers are B and D.
JavaScript Knowledge Reference (text-only)
new CustomEvent(name, options) is the required syntax.
The detail property of the options object is the standard location for custom data.
The second argument must be an object; other types are invalid.
NEW QUESTION # 60
A developer has an isDeg function that takes one argument, pts. They want to schedule the function to run every minute.
What is the correct syntax for scheduling this function?
Answer: C
Explanation:
setInterval(fn, delay, arg1, arg2, ...) calls fn every delay ms, passing extra arguments.
To call isDeg every 60 seconds with "cat":
setInterval(isDeg, 60000, 'cat');
Why others are wrong:
A/D: isDeg('cat') is called immediately, and its return value is scheduled, not the function.
C: setTimeout runs once after 60 seconds, not repeatedly.
________________________________________
NEW QUESTION # 61
A test searches for:
<button class="blue">Checkout</button>
But the actual HTML is:
<button>Checkout</button>
The test fails because it expects a class that no longer exists.
What type of test outcome is this?
Answer: A
Explanation:
Definitions:
False negative → The test reports a failure even though the feature actually works.
False positive → The test reports success when it should not.
True positive → Correctly identifies something is working.
True negative → Correctly identifies something is not working.
In this scenario:
The checkout button does exist, so the feature works.
The test fails incorrectly, because it is checking for the wrong selector.
That is the definition of a false negative.
JavaScript Knowledge Reference (text-only)
Test outcome classification: false negative = feature works but test fails.
NEW QUESTION # 62
A developer is required to write a function that calculates the sum of elements in an array but is getting undefined every time the code is executed. The developer needs to find what is missing in the code below.
01 const sumFunction = arr => {
02 return arr.reduce((result, current) => {
03 //
04 result += current;
05 //
06 }, 10);
07 };
Which line replacement makes the code work as expected?
Answer: C
Explanation:
In a reduce callback, you must return the new accumulator value.
Currently:
(result, current) => {
result += current;
// no return
}
This returns undefined each time, so the accumulator becomes undefined on the next iteration, leading to incorrect results.
Fix by returning result:
const sumFunction = arr => {
return arr.reduce((result, current) => {
result += current;
return result; // line 05
}, 10);
};
Option D correctly adds the return.
Options A/B/C do not fix the missing return in the reducer and therefore do not resolve the core issue.
________________________________________
NEW QUESTION # 63
......
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