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NEW QUESTION # 148
Refer to the code:
Given the code above, which three properties are set pet1?
Choose 3 answers:
Answer: A,B,E
NEW QUESTION # 149
Refer to the code below:
01 const myFunction = arr = > {
02 return arr.reduce((result, current) = > {
03 return result + current;
04 }, 10);
05 }
What is the output of this function when called with an empty array?
Answer: B
Explanation:
We call:
myFunction([]);
Inside:
arr.reduce((result, current) = > {
return result + current;
}, 10);
Key points about Array.prototype.reduce:
* Signature: array.reduce(callback, initialValue)
* If initialValue is provided and the array is empty , reduce:
* Does not call the callback at all.
* Simply returns initialValue.
Here:
* arr is [] (empty).
* initialValue is 10.
So:
* No iterations of the callback happen (no elements to process).
* The return value is the initial value: 10.
So the actual output is:
myFunction([]) === 10;
Among the options:
* A: 0 - incorrect, because the initial value is 10, not 0.
* B: Throws an error - reduce throws only if the array is empty and there is no initialValue. Here we have an initial value, so no error.
* C: NaN - there is no arithmetic with undefined or invalid values; we just return 10.
* D: Returns 5 - the numeric value given is wrong; the correct value is 10.
Given the logic, the correct conceptual result is 10 . The option text "Returns 5" is almost certainly a typo for "Returns 10". Since the letter that is intended to represent the correct behavior is D, we keep:
The answer: D
Study Guide / Concept References (no links):
* Array.prototype.reduce behavior with initialValue
* Behavior of reduce on an empty array with and without initialValue
* Return value when no iterations run
NEW QUESTION # 150
Refer to the code below:
What is the value of result after line 10 executes?
Answer: C
NEW QUESTION # 151
Refer to the code below:
What is the output of this function when called with an empty array?
Answer: B
NEW QUESTION # 152
Refer to the code below (corrected to use a template literal on line 08):
01 let car1 = new Promise((_, reject) = >
02 setTimeout(reject, 2000, " Car 1 crashed in " )
03 );
04 let car2 = new Promise(resolve = >
05 setTimeout(resolve, 1500, " Car 2 completed " )
06 );
07 let car3 = new Promise(resolve = >
08 setTimeout(resolve, 3000, " Car 3 completed " )
09 );
10
11 Promise.race([car1, car2, car3])
12 .then(value = > {
13 let result = `${value} the race.`;
14 })
15 .catch(err = > {
16 console.log( " Race is cancelled. " , err);
17 });
What is the value of result when Promise.race executes?
Answer: A
Explanation:
Understand the three promises:
* car1:
let car1 = new Promise((_, reject) = >
setTimeout(reject, 2000, " Car 1 crashed in " )
);
* Rejects after 2000 ms (2 seconds) with message " Car 1 crashed in " .
* car2:
let car2 = new Promise(resolve = >
setTimeout(resolve, 1500, " Car 2 completed " )
);
* Resolves after 1500 ms (1.5 seconds) with message " Car 2 completed " .
* car3:
let car3 = new Promise(resolve = >
setTimeout(resolve, 3000, " Car 3 completed " )
);
* Resolves after 3000 ms (3 seconds) with message " Car 3 completed " .
Promise.race:
Promise.race([car1, car2, car3])
then(value = > {
let result = `${value} the race.`;
})
catch(err = > {
console.log( " Race is cancelled. " , err);
});
Behavior of Promise.race:
* It settles (resolves or rejects) as soon as any of the given promises settles.
* It uses the value or reason from the first settled promise.
Timing:
* car2 resolves in 1500 ms.
* car1 rejects in 2000 ms.
* car3 resolves in 3000 ms.
The first to settle is car2 at 1500 ms, with value " Car 2 completed " .
Therefore:
* Promise.race resolves (not rejects) with value = " Car 2 completed " .
* The .then handler runs; .catch is ignored because there is no rejection.
Inside .then:
let result = `${value} the race.`;
Substitute value:
let result = " Car 2 completed the race. " ;
So, result becomes:
Car 2 completed the race.
Compare to options:
* A. Car 3 completed the race.
* This would be correct if car3 were the first to resolve, which it is not (it resolves last).
* B. Car 2 completed the race.
* Exactly matches the first-resolving promise and the constructed message.
* C. Race is cancelled.
* This is the prefix of the string logged in the .catch handler, but .catch never runs because the race resolves, it does not reject first.
* D. Car 1 crashed in the race.
* car1 is the first rejection , but since a resolution from car2 happens earlier, the race is already settled successfully before car1 rejects.
Thus the correct value of result as set in the .then block is:
The answer: B
Study Guide / Concept References (no links):
* Promise.race(iterable) semantics (first settled promise wins)
* setTimeout and timing interactions with Promises
* Resolve vs reject paths and .then / .catch
* Template literals and string interpolation for building result messages
NEW QUESTION # 153
......
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