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[Hardware] Review Key Concepts With JavaScript-Developer-I Exam-Preparation Questions

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【Hardware】 Review Key Concepts With JavaScript-Developer-I Exam-Preparation Questions

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Salesforce Certified JavaScript Developer I Exam Sample Questions (Q50-Q55):NEW QUESTION # 50
Refer to the code below:

Which statement allows a developer to cancel the scheduled timed function?
  • A. removeTimeout (timeFunction) ;
  • B. ClearTimeout (timeFunction);
  • C. ClearTimeout (timerId) ;
  • D. removeTimeout (timerId) ;
Answer: A

NEW QUESTION # 51
Refer to the code below:
01 const exec = (item, delay) =>{
02 new Promise(resolve => setTimeout( () => resolve(item), delay)),
03 async function runParallel() {
04 Const (result1, result2, result3) = await Promise.all{
05 [exec ('x', '100') , exec('y', 500), exec('z', '100')]
06 );
07 return `parallel is done: $(result1) $(result2)$(result3)`;
08 }
}
}
Which two statements correctly execute the runParallel () function?
Choose 2 answers
  • A. runParallel ( ). done(function(data){
    return data;
    });
  • B. runParallel () .then(data);
  • C. Async runParallel () .then(data);
  • D. runParallel () .then(function(data)
    return da
Answer: A,D

NEW QUESTION # 52
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 value of result when promise.race execues?
Answer:
Explanation:
Car2 completed the race.

NEW QUESTION # 53
A developer is leading the creation of a new web server for their team that will fulfill API requests from an existing client.
The team wants a web server that runs on Node.Js, and they want to use thenew web framework Minimalist.Js.
The lead developer wants to advocate for a more seasoned back-end framework that already has a community around it.
Which two frameworks could the lead developer advocate for?
Choose 2 answers
  • A. Angular
  • B. Gatsby
  • C. Express
  • D. Koa
Answer: A,B

NEW QUESTION # 54
Given the code below:

What happens when the code executes?
  • A. The ur1 variables has local scope and line 02 throws an error.
  • B. The ur1 variable has global scope and line 02 executes correctly.
  • C. The ur1 variable has global scope and line 02 throws an error.
  • D. The ur1 variable has local scope and line 02 executes correctly.
Answer: B

NEW QUESTION # 55
......
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