CRT-600試験無料問題集（225題）「Salesforce Certified JavaScript Developer I 認定」

出題：1

A test has a dependency on database. query. During the test, the dependency is replaced with an object called database with the method, Calculator query, that returns an array. The developer does not need to verify how many times the method has been called.
Which two test approaches describe the requirement?
Choose 2 answers

A. Black box

B. White box

C. Substitution

D. Stubbing

正解：B,C 解答を投票する

出題：2

Refer to the expression below:
Let x = ('1' + 2) == (6 * 2);
How should this expression be modified to ensure that evaluates to false?

A. Let x = (1 + 2) == ( '6' / 2);

B. Let x = ('1' + 2) == ( 6 * 2);

C. Let x = (1 + 2 ) == ( 6 / 2);

D. Let x = ('1' + ' 2') == ( 6 * 2);

正解：B 解答を投票する

出題：3

A developer is working on an ecommerce website where the delivery date is dynamically calculated based on the current day. The code line below is responsible for this calculation.
Const deliveryDate = new Date ();
Due to changes in the business requirements, the delivery date must now be today's date + 9 days.
Which code meets this new requirement?

A. deliveryDate.date = Date.current () + 9;

B. deliveryDate.setDate(( new Date ( )).getDate () +9);

C. deliveryDate.date = new Date(+9) ;

D. deliveryDate.setDate( Date.current () + 9);

正解：B 解答を投票する

出題：4

developer uses the code below to format a date.

After executing, what is the value of formattedDate?

A. May 10, 2020

B. October 05, 2020

C. November 05, 2020

D. June 10, 2020

正解：D 解答を投票する

出題：5

Universal Containers (UC) just launched a new landing page, but users complain that the website is slow. A developer found some functions any that might cause this problem. To verify this, the developer decides to execute everything and log the time each of these three suspicious functions consumes.
Which function can the developer use to obtain the time spent by every one of the three functions?

A. console. timeLog ()

B. console.trace()

C. console.timeStamp ()

D. console.getTime ()

正解：A 解答を投票する

出題：6

Given the following code:
Let x =null;
console.log(typeof x);
What is the output of the line 02?

A. "Object"

B. "Null"

C. "X"

D. "undefined"

正解：A 解答を投票する

出題：7

A developer wants to iterate through an array of objects and count the objects and count the objects whose property value, name, starts with the letter N.
Const arrObj = [{"name" : "Zach"} , {"name" : "Kate"},{"name" : "Alise"},{"name" : "Bob"},{"name" :
"Natham"},{"name" : "nathaniel"}
Refer to the code snippet below:
01 arrObj.reduce(( acc, curr) => {
02 //missing line 02
02 //missing line 03
04 ). 0);
Which missing lines 02 and 03 return the correct count?

A. Const sum = curr.startsWIth('N') ? 1: 0;
Return curr+ sum

B. Const sum = curr.name.startsWIth('N') ? 1: 0;
Return curr+ sum

C. Const sum = curr.name.startsWith('N') ? 1: 0;
Return acc +sum

D. Const sum = curr.startsWith('N') ? 1: 0;
Return acc +sum

正解：C 解答を投票する

出題：8

Refer to the following object.

How can a developer access the fullName property for dog?

A. Dog, get, fullName

B. Dog, function, fullName

C. Dog.fullName

D. Dog.fullName ( )

正解：C 解答を投票する

出題：9

Given the HTML below:

Which statement adds the priority-account CSS class to the Universal Containers row?

A. document. querySelectorAll('#row-uc') -classList.add("priority-accour');

B. document. queryselector('#row-uc').ClassList.add('priority-account');

C. document. querySelector (#row-uc'). classes-push('priority-account');

D. document. getElementByid('row-uc').addClass('priority-account*);

正解：B 解答を投票する

出題：10

Refer to the following array:
Let arr = [1, 2, 3, 4, 5];
Which three options result in x evaluating as [1, 2]?
Choose 3 answer

A. let x = arr.filter ((a) => 2 }) ;

B. let x = arr. slice (2);

C. let x arr.filter((a) => (return a <= 2 });

D. let x =arr.splice(0, 2);

E. let x = arr. slice (0, 2);

正解：C,D,E 解答を投票する

出題：11

Which statement accurately describes the behaviour of the async/ await keyworks ?

A. The associated class contains some asynchronous functions.

B. The associated function can only be called via asynchronous methods

C. The associated sometimes returns a promise.

D. The associated function will always return a promise

正解：D 解答を投票する

出題：12

Refer to the following code that imports a module named utils:
import (foo, bar) from '/path/Utils.js';
foo() ;
bar() ;
Which two implementations of Utils.js export foo and bar such that the code above runs without error?
Choose 2 answers

A. const foo = () => { return 'foo' ; }
const bar = () => { return 'bar' ; }
export { bar, foo }

B. Export default class {
foo() { return 'foo' ; }
bar() { return 'bar' ; }
}

C. const foo = () => { return 'foo';}
const bar = () => {return 'bar'; }
Export default foo, bar;

D. // FooUtils.js and BarUtils.js exist
Import (foo) from '/path/FooUtils.js';
Import (boo) from ' /path/NarUtils.js';

正解：A,B 解答を投票する

出題：13

Given code below:
setTimeout (() => (
console.log(1);
). 0);
console.log(2);
New Promise ((resolve, reject )) = > (
setTimeout(() => (
reject(console.log(3));
). 1000);
)).catch(() => (
console.log(4);
));
console.log(5);
What is logged to the console?

A. 2 5 1 3 4

B. 1 2 4 3 5

C. 2 1 4 3 5

D. 1 2 5 3 4

正解：A 解答を投票する

出題：14

A developer has an ErrorHandler module that contains multiple functions.
What kind of export be leverages so that multiple functions can be used?

A. Named

B. All

C. Default

D. Multi

正解：A 解答を投票する

出題：15

Refer to code below:
console.log(0);
setTimeout(() => (
console.log(1);
});
console.log(2);
setTimeout(() => {
console.log(3);
), 0);
console.log(4);
In which sequence will the numbers be logged?

A. 01234

B. 02431

C. 13024

D. 02413

正解：B 解答を投票する

出題：16

A developer wants to use a module called DataPrettyPrint. This module exports one default function called printDate ().
How can a developer import and use the printDate() function?
A)

B)

C)

D)

A. Option D

B. Option C

C. Option A

D. Option B

正解：D 解答を投票する

出題：17

A developer is leading the creation of a new web server for their team that will fulfill API requests from an existing client.
The team wants a web server that runs on Node.Js, and they want to use the new web framework Minimalist.Js. The lead developer wants to advocate for a more seasoned back-end framework that already has a community around it.
Which two frameworks could the lead developer advocate for?
Choose 2 answers

A. Koa

B. Express

C. Angular

D. Gatsby

正解：B,C 解答を投票する

出題：18

A developer writes the code below to return a message to a user attempting to register a new username. If the username is available, a variable named nag is declared and assigned a value on line 03.