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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q139-Q144):

NEW QUESTION # 139
Which two console logs output NaN?

Answer: C,D

Explanation:
Comprehensive and Detailed Explanation From JavaScript Knowledge:
Recall:
NaN stands for "Not-a-Number".
Arithmetic involving non-numeric values that cannot be converted to numbers often results in NaN.
Check each:
A . 10 / 0
In JavaScript, dividing a positive number by 0 results in Infinity, not NaN.
So this logs Infinity.
B . parseInt('two')
parseInt tries to parse a numeric prefix from the string.
'two' does not start with numeric digits, so parseInt('two') returns NaN.
The console log prints NaN.
C . 10 / Number('5')
Number('5') → 5.
10 / 5 → 2.
Logs 2, not NaN.
D . 10 / 'five'
'five' is coerced to a number using Number('five'), which is NaN.
10 / NaN → NaN.
Logs NaN.
So the console logs that output NaN are from B and D.
Relevant concepts: NaN, Infinity, parseInt, Number() coercion, arithmetic with invalid numeric values.
________________________________________


NEW QUESTION # 140
bar, awesome is a popular JavaScript module. the versions publish to npm are:
Teams at Universal Containers use this module in a number of projects. A particular project has thepackage, json definition below.

A developer runs this command: npm install. Which version of bar .awesome is installed?

Answer: D


NEW QUESTION # 141
Refer to the code below:
let car1 = new Promise((_ ,reject)=> setTimeout(reject,2000,"Car1 crashed in")); let car2 = new Promise(resolve => setTimeout(resolve,1500,"Car2 completed")); let car3 = new Promise(resolve => setTimeout(resolve,3000,"Car3 completed")); Promise.race([car1,car2,car3])
.then(value=>{
let result = `${value} the race.`;
}).catch(err=>{
console.log('Race is cancelled.',err);
});
What is the valueof result when promise.race execues?

Answer:

Explanation:
Car2 completed the race.


NEW QUESTION # 142
A Node.js server library uses events and callbacks. The developer wants to log any issues the server has at boot time.
Which code logs an error with an event?

Answer: A

Explanation:
console.log('ERROR', error);
}
Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge Node.js event-based modules use the EventEmitter pattern.
The correct syntax for listening to events is:
emitter.on('eventName', callback)
The server library emits an 'error' event, which must be listened to using .on.
Option analysis:
A: .catch is for Promises, not EventEmitters.
B: .error is not an EventEmitter method.
C: Correct. Listens to the 'error' event.
D: try...catch only captures synchronous errors, not event-based asynchronous errors.
Therefore, the correct answer is option C.
________________________________________
JavaScript Knowledge Reference (text-only)
The EventEmitter API uses on(event, handler) to listen for events.
Errors emitted asynchronously cannot be caught with try...catch.
The 'error' event is standard for Node.js modules to signal operational errors.


NEW QUESTION # 143
A developer creates a simple webpage with an input field. When a user enters text and clicks the button, the actual value must be displayed in the console:
HTML:
<input type="text" value="Hello" name="input">
<button type="button">Display</button>
JavaScript:
01 const button = document.querySelector('button');
02 button.addEventListener('click', () => {
03 const input = document.querySelector('input');
04 console.log(input.getAttribute('value'));
05 });
When the user clicks the button, the output is always "Hello".
What needs to be done to make this code work as expected?

Answer: A

Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge getAttribute('value') This returns the initial HTML attribute, not the live, updated value.
Even if the user edits the text, the value attribute remains "Hello" because HTML attributes do not update dynamically.
Input elements have a property value that always reflects the live current text inside the field.
So:
input.value
returns the user-entered value.
Therefore, line 04 must use the property, not the attribute:
console.log(input.value);
This ensures the updated input value is displayed.
________________________________________
JavaScript knowledge references (text-only)
HTML attributes are static and retrieved using getAttribute().
DOM element properties (like value) represent the current live state.
Input value changes update the .value property, not the attribute.


NEW QUESTION # 144
......

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