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How to Prepare for Salesforce JavaScript Developer I Exam

Preparation Guide for Salesforce JavaScript Developer I Exam

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q99-Q104):

NEW QUESTION # 99
At Universal Containers, every team has its own way of copying JavaScript objects. The code Snippet shows an implementation from one team:
Function Person() {
this.firstName = "John";
this.lastName = 'Doe';
This.name =() => (
console.log('Hello $(this.firstName) $(this.firstName)');
)}
Const john = new Person ();
Const dan = JSON.parse(JSON.stringify(john));
dan.firstName ='Dan';
dan.name();
What is the Output of the code execution?

A. TypeError: dan.name is not a function
B. Hello John DOe
C. TypeError: Assignment to constant variable.
D. Hello Dan Doe

Answer: A

NEW QUESTION # 100
developer has a web server running with Node.js. The command to start the web
server is node server,js. The web server started having latency issues. Instead of a one second
turn around for web requests, the developer now sees a five second turnaround,
Which command can the web developer run to see what the module is doing during the
latency period?

A. NODE_DEBUG =http, https node server.js
B. DEBUG =true node server.js
C. NODE_DEBUG =true node server.js
D. DEBUG = http, https node server.js

Answer: B

NEW QUESTION # 101
Which code statement below correctly persists an objects in local Storage ?

A. const setLocalStorage = (storageKey, jsObject) => {
window.localStorage.setItem(storageKey, JSON.stringify(jsObject));
}
B. const setLocalStorage = ( jsObject) => {
window.localStorage.connectObject(jsObject));
}
C. const setLocalStorage = ( jsObject) => {
window.localStorage.setItem(jsObject);
}
D. const setLocalStorage = (storageKey, jsObject) => {
window.localStorage.persist(storageKey, jsObject);
}

Answer: A

Explanation:

NEW QUESTION # 102
Refer to the code below:
console.log(''start);
Promise.resolve('Success') .then(function(value){
console.log('Success');
});
console.log('End');
What is the output after the code executes successfully?

A. Success
Start
End
B. Start
End
Success
C. Start
Success
End
D. End
Start
Success

Answer: B

NEW QUESTION # 103
A developer has a server running with Node.js. the command to start the web server is node server.js. the server started having latency issues. Instead of a one second turnaround for web requests, the developer now sees a five second turnaround.
Which command can the web developer run to see what the module is doing during the latency period?

A. DEBUO=true node server,js
B. DEBUO=http, https node server,js
C. NODE_DEBUO=true node server,js
D. NODE_DEBUO=http, https node server,js

Answer: B

NEW QUESTION # 104
......

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