Salesforce JavaScript-Developer-I - Salesforce Certified JavaScript Developer (JS-Dev-101)
A developer wants to set up a secure web server withNode.js. The developer creates a
directory locally called app-server, and the first file is app-server/index.js
Without using any third-party libraries, what should the developer add to index.js to create the
secure web server?
Refer to the code below:
function changeValue(param) {
Param =5;
}
Let a =10;
Let b =5;
changeValue(b);
Const result = a+ “ - â€+ b;
What is the value of result when code executes?
A developer is required to write a function that calculates the sum of elements in an
array but is getting undefined every time the code is executed. The developer needs to find
what is missing in the code below.
Const sumFunction = arr => {
Return arr.reduce((result, current) => {
//
Result += current;
//
), 10);
);
Which option makes the code work as expected?
Given the following code:
Let x =(‘15’ + 10)*2;
What is the value of a?
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?
Which statement parses successfully?
A test has a dependency on database.query. During the test the dependency is replaced
with an object called database with the method, query, that returns an array. The
developer needs to verify how many times the method was called and the arguments
used each time.
Which two test approaches describe the requirement?
Choose 2 answers
Refer to the following code:
Let sampleText = ‘The quick brown fox jumps’;
A developer needs to determine if a certainsubstring is part of a string.
Which three expressions return true for the given substring ?
Choose 3 answers
A developer has two ways to write a function:
Option A:
function Monster(){
this.growl = ()=>{
console.log('Grr!');
}
}
Option B:
function Monster(){};
Monster.prototype.growl = ()=>{
console.log('Grr!');
}
After deciding on an option, the developercreates 1000 monster objects.
How many growl methods are created with Option A and Option B?
Refer to code below:
Let first = ‘who’;
Let second = ‘what’;
Try{
Try{
Throw new error(‘Sad trombone’);
}catch (err){
First =’Why’;
}finally {
Second =’when’;
} catch (err) {
Second =’Where’;
}
What are the values for first and second once the code executes ?
