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Question 49/90
Refer to the code below:
01 const exec = (item, delay) =>{
02newPromise(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
01 const exec = (item, delay) =>{
02newPromise(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
Recent Comments (The most recent comments are at the top.)
To correctly execute the runParallel() function in the given code, you need to handle the function's promise correctly. The runParallel() function is asynchronous, so it returns a promise, and you can use .then() to handle the resolved value of this promise.
Correct Answers:
C. runParallel().then(data);
D. runParallel().then(function(data) { return data; });
Explanation:
C. runParallel().then(data);
This calls the runParallel() function and attaches a .then() handler to process the resolved value of the promise returned by runParallel().
D. runParallel().then(function(data) { return data; });
This calls the runParallel() function and attaches a .then() handler. The function inside .then() is defined to take data as an argument and return it. This ensures the resolved value is returned or processed further.
Incorrect Options:
A. runParallel().done(function(data) { return data; });
.done() is not a valid method for handling promises in JavaScript. The correct method is .then().
B. Async runParallel().then(data);
The correct syntax for calling an async function and handling its promise does not require the Async keyword here. The function runParallel is already defined as async, and you call it directly with runParallel().then(data);....