JavaScript-Developer-I證照信息 - JavaScript-Developer-I考證

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JavaScript-Developer-I考證 & JavaScript-Developer-I認證指南

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最新的 Salesforce Developer JavaScript-Developer-I 免費考試真題 (Q68-Q73):

問題 #68
Refer to the code snippet below:
Let array = [1, 2, 3, 4, 4, 5, 4, 4];
For (let i =0; i < array.length; i++)
if (array[i] === 4) {
array.splice(i, 1);
}
}
What is the value of array after the code executes?

A. [1, 2, 3, 5]
B. [1, 2, 3, 4, 5, 4]
C. [1, 2, 3, 4, 5, 4, 4]
D. [1, 2, 3, 4, 4, 5, 4]

答案：D

解題說明：

問題 #69
A developer has the following array of student test grades:
Let arr - [7, 8, 5, 9]
How should want to double each score and then see an array of the students who scored more than 15 points.
How should the developer implement the request?

A. Let arr1 = arr.mapBy ((num) => return num + 2 )) .filterBy ((val) => ( return val > 15 )) ;
B. Let arr1 = arr.map ((num) => num + 2 .filter ((val) => val 15 );
C. Let arr1 = arr .filter ((filter ((val) => ( return val > 15 )) .map (( num => ( return num +2 ));
D. Let arr1 = arr .map ((num => ( num + 2 )) .filterBy ((val => ( val 15 )) ;

答案：B

問題 #70
Refer to the code below:
01 new Promise((resolve, reject) = > {
02 const fraction = Math.random();
03 if (fraction > 0.5) reject( ' fraction > 0.5, ' + fraction);
04 resolve(fraction);
05 })
06 .then(() = > console.log( ' resolved ' ))
07 .catch((error) = > console.error(error))
08 .finally(() = > console.log( ' when am I called? ' ));
When does Promise.finally on line 08 get called?

A. When rejected
B. When resolved and settled
C. When resolved
D. When resolved or rejected

答案：D

解題說明：
Behavior of Promise.prototype.finally:
* .finally(handler) registers a callback that runs when the promise is settled , meaning:
* Either fulfilled (resolved) , or
* rejected .
Important points:
* The finally callback does not receive the promise's value or error (unlike then and catch).
* It is executed after the promise is settled, but before the resolution value or rejection reason is passed further down the chain.
* It runs in both success and failure paths.
In the given code:
* The promise may either:
* Call reject( ' fraction > 0.5, ' + fraction) if fraction > 0.5, or
* Call resolve(fraction) otherwise.
In both cases:
* If it resolves , .then(() = > console.log( ' resolved ' )) runs, and then .finally(...) is executed.
* If it rejects , .catch((error) = > console.error(error)) runs, and then .finally(...) is executed.
So .finally runs:
* Not just "when rejected".
* Not just "when resolved".
* But whenever the promise is resolved or rejected .
Therefore, the correct choice is:
* D. When resolved or rejected .

問題 #71
Refer to the code snippet below:
Let array = [1, 2, 3, 4, 4, 5, 4, 4];
For (let i =0; i < array.length; i++)
if (array[i] === 4) {
array.splice(i, 1);
}
}
What is the value of array after the code executes?

A. [1, 2, 3, 5]
B. [1, 2, 3, 4, 5, 4]
C. [1,2, 3, 4, 5, 4, 4]
D. [1, 2, 3, 4, 4, 5, 4]

答案：D

問題 #72
Refer to the code below:

Which replacement for the conditional statement on line 02 allows a developer to correctly determine that a specific element, myElement on the page had been clicked?

A. event.target.id =='myElement'

答案：A

問題 #73
......

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