Effective Way to Prepare for the copyright JavaScript-Developer-I Certification Exam?

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copyright Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q148-Q153):

NEW QUESTION # 148
developer wants to use a module named universalContainersLib and them call functions
from it.
How should a developer import every function from the module and then call the fuctions foo
and bar ?

Answer: D


NEW QUESTION # 149
JavaScript:
01 function Tiger() {
02 this.type = ' Cat ' ;
03 this.size = ' large ' ;
04 }
05
06 let tony = new Tiger();
07 tony.roar = () = > {
08 console.log( ' They ' re great! ' );
09 };
10
11 function Lion() {
12 this.type = ' Cat ' ;
13 this.size = ' large ' ;
14 }
15
16 let leo = new Lion();
17 // Insert code here
18 leo.roar();
Which two statements could be inserted at line 17 to enable line 18?

Answer: A,D

Explanation:
There are two valid ways to ensure leo.roar() exists:
* Directly assign a roar function to leo (Option A). Assigning a property to an instance object creates a new method on that instance.
* leo.roar = () = > { console.log( ' They ' re pretty good! ' ); };
After this, calling leo.roar() is valid.
* Copy tony's properties into leo using Object.assign (Option B). Object.assign(target, source) copies enumerable own properties from the source object into the target object. Since tony.roar exists, executing:
* Object.assign(leo, tony);
copies roar into leo, making leo.roar() valid.
Why the other answers are incorrect:
* Option C: Object.assign(leo, Tiger) copies properties from the function object Tiger , not from Tiger.
prototype and not from a Tiger instance. Tiger (the function) has no roar property, so nothing useful is copied.
* Option D: leo.prototype is undefined because leo is an instance, not a constructor function. Only constructor functions have a .prototype property. This line would cause an error.
JavaScript Knowledge References (text-only)
* Instances have their own properties and do not contain a .prototype property.
* Object.assign(target, source) copies own enumerable properties of the source object.
* Assigning a function as a property of an object creates a callable method.


NEW QUESTION # 150
Refer to the following code block:

What is the console output?

Answer: B


NEW QUESTION # 151
A developer is leading the creation of a new browser application that will serve a single
page application. The team wants to use a new web framework Minimalsit.js. The Lead
developer wants to advocate for a more seasoned web framework that already has a
community around it.
Which two frameworks should the lead developer advocate for?
Choose 2 answers

Answer: B,D


NEW QUESTION # 152
A developer has code that calculates a restaurant bill, but generates incorrect answers while testing the code:
function calculateBill ( items ) {
let total = 0;
total += findSubTotal(items);
total += addTax(total);
total += addTip(total);
return total;
}
Which option allows the developer to step into each function execution within calculateBill?

Answer: D


NEW QUESTION # 153
......

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