JavaScript-Developer-I 試験問題を無料オンラインアクセス

A team at Universal Containers works on a big project and uses yarn to manage the project ' s dependencies.
A developer added a dependency to manipulate dates and pushed the updates to the remote repository. The rest of the team complains that the dependency does not get downloaded when they execute yarn .
What could be the reason for this?

• A.The developer added the dependency as a dev dependency, and NODE_ENV is set to production.
• B.The developer missed the option --add when adding the dependency.
• C.The developer missed the option --save when adding the dependency.
• D.The developer added the dependency as a dev dependency, and YARN_ENV is set to production.

Refer to the following code:
01 let obj = {
02 foo: 1,
03 bar: 2
04 }
05 let output = []
06
07 for (let something of obj) {
08 output.push(something);
09 }
10
11 console.log(output);
What is the value of output on line 11?

• A.[1, 2]
• B.[ " foo:1 " , " bar:2 " ]
• C.An error will occur due to the incorrect usage of the for_of statement on line 07.
• D.[ " foo " , " bar " ]

At Universal Containers, every team has its own way of copying JavaScript objects. The code snippet shows an implementation from one team:
01 function Person() {
02 this.firstName = " John " ;
03 this.lastName = " Doe " ;
04 this.name = () = > {
05 console.log( ' Hello ${this.firstName} ${this.lastName} ' );
06 }
07 }
08
09 const john = new Person();
10 const dan = JSON.parse(JSON.stringify(john)); // (intended deep copy)
11 dan.firstName = ' Dan ' ;
12 dan.name();
(Original line 10 is logically intended to be JSON.parse(JSON.stringify(john)) to perform a JSON clone.) What is the output of the code execution?

• A.Hello Dan Doe
• B.Hello Dan
• C.TypeError: dan.name is not a function
• D.Hello John Doe

Refer to the code below:
01 let sayHello = () = > {
02 console.log( ' Hello, World! ' );
03 };
Which code executes sayHello once , two minutes from now?

• A.delay(sayHello, 120000);
• B.setTimeout(sayHello, 120000);
• C.setInterval(sayHello, 120000);
• D.setTimeout(sayHello(), 120000);

HTML:
< p > The current status of an Order: < span id= " status " > In Progress < /span > < /p > Which JavaScript statement changes ' In Progress ' to ' Completed ' ?

• A.document.getElementById( " .status " ).innerHTML = ' Completed ' ;
• B.document.getElementById( " status " ).innerHTML = ' Completed ' ;
• C.document.getElementById( " status " ).Value = ' Completed ' ;
• D.document.getElementById( " #status " ).innerHTML = ' Completed ' ;