JavaScript-Developer-I試験無料問題集（224題）「Salesforce Certified JavaScript Developer I 認定」

出題：1

Refer to the code below:
for(let number =2 ; number <= 5 ; number += 1 ) {
// insert code statement here
}
Thedeveloper needs to insert a code statement in the location shown. The code statement has these requirements:
1. Does require an import
2. Logs an error when the boolean statement evaluates to false
3. Works in both the browser and Node.js
Which meet the requirements?

A. console.debug(number % 2 === 0);

B. assert (number % 2 === 0);

C. console.assert(number % 2 === 0);

D. console.error(number % 2 === 0);

正解：D 解答を投票する

出題：2

Which two options are core Node.js modules?
Choose 2 answers

A. http

B. isotream

C. worker

D. exception

正解：A,B 解答を投票する

出題：3

Given the following code:
Counter = 0;
const logCounter = () => {
console.log(counter);
);
logCounter();
setTimeout(logCOunter, 1100);
setInterval(() => {
Counter++
logCounter();
}, 1000);
What is logged by the first four log statements?

A. 0 1 2 3

B. 0 0 1 2

C. 0 1 2 2

D. 0 1 1 2

正解：D 解答を投票する

出題：4

Refer the code below.
x=3.14;
function myfunction() {
"use strict";
y=x;
}
z=x;
myFunction();

正解：

Z is equal to 3.14
Use strict has effect only on line 5.
Line 5 throws an error

出題：5

Which two code snippets showworking examples of a recursive function?
Choose 2 answers

A. Let countingDown = function(startNumber) {If ( startNumber >0) {console.log(startNumber) ;return countingDown(startNUmber);} else {return startNumber;}};

B. Const factorial =numVar => {If (numVar < 0) return;If ( numVar === 0 ) return 1;returnnumVar * factorial ( numVar - 1 );};

C. Function factorial ( numVar ) {If (numVar < 0) return;If ( numVar === 0 ) return 1;return numVar -1;

D. Const sumToTen = numVar => {If (numVar < 0)Return;return sumToTen(numVar + 1)};

正解：A,B 解答を投票する

出題：6

Refer to the code below:
01 const exec = (item, delay) =>{
02 newPromise(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. Async runParallel () .then(data);

B. runParallel () .then(function(data)return data

C. runParallel ( ). done(function(data){return data;});

D. runParallel () .then(data);

正解：B,C 解答を投票する

出題：7

myArraym can have one level, two levels, or more levels.
Which statement flattens myArray when it can be arbitrarily nested?

A. [ ] .concat {. . .myArray) ;

B. myArray.flat(Infinity);

C. myArray. join (",").split (",");

D. myArray. reduce ((prev, curr) => prev.concat(curr) [ ]);

正解：D 解答を投票する

出題：8

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 the array after the code executes?

A. [1, 2, 3, 5]

B. [1, 2, 3, 4, 5, 4, 4]

C. [1, 2, 3, 4, 5, 4]

D. [1, 2, 3, 4, 4, 5, 4]

正解：C 解答を投票する

出題：9

Refer to the code below:

What is the result when the Promise in the execute function is rejected?

A. Rejected1 Rejected2 Rejected3 Rejected Rejected Rejected4

B. Resolved1 Resolved2 Resolved3Resolved4

C. Rejected

D. Rejected Resolved

正解：D 解答を投票する

出題：10

Refer to the code below:
function changeValue(param) {
Param =5;
}
Let a =10;
Let b =5;
changeValue(b);
Const result = a+ " - "+ b;
What is the value of result when code executes?

A. 5 -5

B. 5 - 10

C. 10 -10

D. 10 - 5

正解：C 解答を投票する

出題：11

Refer to code below:
Let a ='a';
Let b;
// b = a;
console.log(b);
What is displayed when the code executes?

A. A

B. Null

C. Undefined

D. ReferenceError: b is not defined

正解：C 解答を投票する

出題：12

Refer to the following code:

What is the output of line 11?

A. ["foo:1", "bar:2"]

B. [1,2]

C. ["bar", "foo"]

D. ["foo", "bar"]

正解：D 解答を投票する

出題：13

A developer is trying to handle an error within a function.
Which code segment shows the correct approach to handle an error without propagating it elsewhere?

A.

B.

C.

D.

正解：C 解答を投票する

JavaScript-Developer-I試験無料問題集「Salesforce Certified JavaScript Developer I 認定」