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Salesforce JS-Dev-101 Exam Syllabus Topics:

Topic	Details
Topic 1	Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
Topic 2	Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.
Topic 3	Objects, Functions, and Classes: Covers function, object, and class implementations to meet business requirements, along with the use of modules, decorators, variable scope, and execution flow.

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q15-Q20):

NEW QUESTION # 15
Refer to HTML below:
<p> The current status of an Order: <span id ="status"> In Progress </span></p>.
Which JavaScript statement changes thetext 'In Progress' to 'Completed' ?

A. document.getElementById(".status").innerHTML = 'Completed' ;
B. document.getElementById("status").innerHTML = 'Completed' ;
C. document.getElementById("status").Value = 'Completed' ;
D. document.getElementById("#status").innerHTML = 'Completed' ;

Answer: B

NEW QUESTION # 16
Refer to the code below:
Let car1 = new Promise((_ , reject) =>
setTimeout(reject, 2000, "car 1 crashed in" =>
Let car2 =new Promise(resolve => setTimeout(resolve, 1500, "car 2 completed") Let car3 =new Promise(resolve =>setTimeout(resolve, 3000, "car 3 completed") Promise.race(( car1, car2, car3))
.then (value => (
Let result = '$(value) the race.';)}
.catch(arr => {
console.log("Race is cancelled.", err);
});
What is the value of result when Promise.race executes?

A. Car 2 completed the race.
B. Race is cancelled.
C. Car 1 crashed in the race.
D. Car3 completes the race

Answer: A

NEW QUESTION # 17
Refer to the code below:
let o = {
get js() {
let city1 = String("st. Louis");
let city2 = String(" New York");
return {
firstCity: city1.toLowerCase(),
secondCity: city2.toLowerCase(),
}
}
}
What value can a developer expect when referencing o.js.secondCity?

A. An error
B. ' new york '
C. ' New York '
D. Undefined

Answer: B

NEW QUESTION # 18
Why does second have access to variable a?

A. Inner function's scope
B. Prototype Chain
C. Hoisting
D. Outer function's scope

Answer: D

Explanation:
The answer is B because JavaScript uses lexical scope.
When a function is created inside another function, the inner function can access variables from the outer function where it was defined.
For example:
function first() {
let a = 10;
function second() {
console.log(a);
}
second();
}
Here, a belongs to the outer function first(). The inner function second() can access it because JavaScript looks for variables through the scope chain.
The lookup works like this:
1. Look inside second()
2. If not found, look inside first()
3. If not found, look in the global scope
Since a is found in the outer function's scope, second() can use it.
This is also the basis of a closure. A closure allows an inner function to remember and access variables from its outer lexical environment.
Why the other options are incorrect:
A is not the best answer because a is not declared inside second() itself.
C is incorrect because the prototype chain is used for object property lookup, not local variable scope lookup.
D is incorrect because hoisting explains how declarations are moved during compilation, but it does not explain why an inner function can access an outer function's variable.
Therefore, the verified answer is B.

NEW QUESTION # 19
Refer to the code below:
Const myFunction = arr => {
Return arr.reduce((result, current) =>{
Return result = current;
}, 10};
}
What is the output of this function when called with an empty array ?

A. Returns 0
B. Returns NaN
C. Returns 10
D. Throws an error

Answer: C

NEW QUESTION # 20
......

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