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[General] Providing You Professional Exam JS-Dev-101 Vce with 100% Passing Guarantee

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【General】 Providing You Professional Exam JS-Dev-101 Vce with 100% Passing Guarantee

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q203-Q208):NEW QUESTION # 203
A developer is wondering whether to use, Promise.then or Promise.catch, especially when a Promise throws an error?
Which two promises are rejected?
Which 2 are correct?
  • A. Promise.reject('cool errorhere').then(error => console.error(error));
  • B. Promise.reject('cool error here').catch(error => console.error(error));
  • C. New Promise((resolve, reject) => (throw 'cool error here'}).catch(error =>console.error(error)) ;
  • D. New Promise(() => (throw 'cool error here'}).then(null, error => console.error(error)));
Answer: B,C

NEW QUESTION # 204
Universal Containers (UC) notices that its application that allows users to search for accounts makes a network request each time a key is pressed. This results in too many requests for the server to handle.
* Address this problem, UC decides to implement a debounce function on string change handler.
What are three key steps to implement this debounce function?
Choose 3 answers:
  • A. When thesearch string changes, enqueue the request within a setTimeout.
  • B. If there is an existing setTimeout and the search string change, allow the existingsetTimeout to finish, and do not enqueue a new setTimeout.
  • C. If there is an existing setTimeout and the search string changes, cancel the existingsetTimeout using thepersisted timerId and replace it with a new setTimeout.
  • D. Store the timeId of the setTimeout last enqueued by the search string change handle.
  • E. Ensure that the network request has the property debounce set to true.
Answer: A,B,E

NEW QUESTION # 205
After user acceptance testing, the developer is asked to change the webpage background based on user's location. This change was implemented and deployed for testing.
The tester reports that the background is not changing, however it works as required when viewing on the developer's computer.
Which two actions will help determine accurate results?
Choose 2 answers
  • A. The tester should disable their browser cache.
  • B. The tester should dear their browser cache.
  • C. The developer should inspect their browser refresh settings.
  • D. The developer should rework the code.
Answer: B,C

NEW QUESTION # 206
A developer has two ways to write a function:
Option A:
function Monster(){
this.growl = ()=>{
console.log('Grr!');
}
}
Option B:
function Monster(){};
Monster.prototype.growl = ()=>{
console.log('Grr!');
}
After deciding on an option, the developercreates 1000 monster objects.
How many growl methods are created with Option A and Option B?
  • A. 1000 for Option A, 1 for Option B
  • B. 1000 for both
  • C. 1 methods for both
  • D. 1 for Option A, 1000 for Option B
Answer: C

NEW QUESTION # 207
Given the following code:
Let x =('15' + 10)*2;
What is the value of a?
  • A. 0
  • B. 1
  • C. 2
  • D. 3
Answer: D

NEW QUESTION # 208
......
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