Question # 1
Which three options show valid methods for creating a fat arrow function?
Choose 3 answers
| | A. x => ( console.log(‘ executed ’) ; )
| | B. [ ] => ( console.log(‘ executed ’) ;)
| | C. ( ) => ( console.log(‘ executed ’) ;)
| | D. X,y,z => ( console.log(‘ executed ’) ;)
| | E. (x,y,z) => ( console.log(‘ executed ’) ;) |
A. x => ( console.log(‘ executed ’) ; )
E. (x,y,z) => ( console.log(‘ executed ’) ;)
Question # 2
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 developer creates 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. 1 methods for both | | C. 1000 for both | | D. 1 for Option A, 1000 for Option B |
Question # 3
The developer has a function that prints “Hello” to an input name. To test this, thedeveloper created a function that returns “World”. However the following snippet does not print “ Hello
World”.
What can the developer do to change the code to print “Hello World” ?
| | A. Change line 7 to ) () ;
| | B. Change line 2 to console.log(‘Hello’ , name() );
| | C. Change line 9 to sayHello(world) ();
| | D. Change line 5 to function world ( ) { |
B. Change line 2 to console.log(‘Hello’ , name() );
Question # 4
A developer wants to use a try...catch statement to catch any error that countSheep () may
throw and pass it to a handleError () function.
What is the correct implementation of the try...catch?
| | A. Option
| | B. Option
| | C. Option
| | D. Option |
D.
Question # 6
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. If there is an existing setTimeout and the search string change, allow the existing setTimeout to finish, and do not enqueue a new setTimeout.
| | B. When the search string changes, enqueue the request within a setTimeout.
| | C. Ensure that the network request has the property debounce set to true.
| | D. If there is an existing setTimeout and the search string changes, cancel the existing
setTimeout using the persisted timerId and replace it with a new setTimeout.
| | E. Store the timeId of the setTimeout last enqueued by the search string change handle. |
A. If there is an existing setTimeout and the search string change, allow the existing setTimeout to finish, and do not enqueue a new setTimeout.
B. When the search string changes, enqueue the request within a setTimeout.
C. Ensure that the network request has the property debounce set to true.
Question # 7
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 3 completes the race | | B. Car 2 completed the race.
| | C. Car 1 crashed in the race.
| | D. Race is cancelled. |
B. Car 2 completed the race.
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