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Salesforce JS-Dev-101 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Asynchronous Programming: Covers asynchronous programming concepts and understanding how the event loop controls execution flow and determines outcomes.
Topic 2
  • Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.
Topic 3
  • Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
Topic 4
  • Browser and Events: Covers DOM manipulation, event handling and propagation, browser-specific APIs, and using Browser Developer Tools to inspect code behavior.
Topic 5
  • Variables, Types, and Collections: Covers declaring and initializing variables, working with strings, numbers, dates, arrays, and JSON, along with understanding type coercion and truthy
  • falsy evaluations.

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q28-Q33):

NEW QUESTION # 28
A developer publishes a new version of a package with bug fixes but no breaking changes. The old version number was 2.1.1.
What should the new package version number be based on semantic versioning?

Answer: C

Explanation:
Semantic versioning: MAJOR.MINOR.PATCH
MAJOR: incompatible API changes.
MINOR: add functionality in a backward compatible manner.
PATCH: backward compatible bug fixes.
Here:
Bug fixes only, no breaking changes โ†’ increment PATCH.
From 2.1.1 to 2.1.2.
So the correct new version is 2.1.2.


NEW QUESTION # 29
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: B

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 # 30
Refer to the following code:

What is the output of line 11?

Answer: B


NEW QUESTION # 31
Referto the code below:
new Promise((resolve, reject) => {
const fraction = Math.random();
if( fraction >0.5) reject("fraction > 0.5, " + fraction);
resolve(fraction);
})
.then(() =>console.log("resolved"))
.catch((error) => console.error(error))
.finally(() =>console.log(" when am I called?"));

When does Promise.finally on line 08 get called?

Answer: D


NEW QUESTION # 32
function myFunction() {
a = a + b;
var b = 1;
}
myFunction();
console.log(a);
console.log(b);
Which statement is correct?

Answer: A

Explanation:
Inside myFunction:
var b is hoisted; initially b is undefined within the function.
Expression a = a + b;:
b is undefined.
a is looked up in the global scope. In non-strict mode, reading an undeclared global gives undefined, then a = a + b becomes a = undefined + undefined โ†’ NaN, and assigns global a.
After myFunction(), globally:
a exists and is NaN.
b is not declared globally; the var b was local.
So:
console.log(a); // logs NaN (executed fine)
console.log(b); // ReferenceError: b is not defined


NEW QUESTION # 33
......

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