Excellent JavaScript-Developer-I Updated 2021 Dumps With 100% Exam Passing Guarantee
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NEW QUESTION 37
Refer to the code below:
Let textvalue = '1984';
Which code segment shows a correct way to convert this string to an integer?
- A. Let numberValue = textValue. Tointeger ( ) ;
- B. Let numberValue = Integer ( textValue );
- C. Let numberValue = (Number) textvalue;
- D. Let numberValue = Number(textvalue);
Answer: D
NEW QUESTION 38
The developer has a function that prints "Hello" to an input name. To test this, thedeveloper created a function that returns "World". However the following snippet does not print " Hello World".
What can the developer do to change the code to print "Hello World" ?
- A. Change line 9 to sayHello(world) ();
- B. Change line 7 to ) () ;
- C. Change line 2 to console.log('Hello' , name() );
- D. Change line 5 to function world ( ) {
Answer: C
NEW QUESTION 39
Which three options show valid methods for creating a fat arrow function? Choose 3 answers
- A. { } => { console.log (executed') ; )
- B. ( ) => { console.log (' executed') ; )
- C. X => {console.log {'executed'} ; }
- D. X, y, z => ( console.log ('executed') ; )
- E. (x, y, z) => (console.log ('executed') ;)
Answer: B,C,E
NEW QUESTION 40
A developer writes the code below to calculate the factorial of a given number.
What is the result of executing line 04?
- A. -Infinity
- B. RuntimeError
- C. 0
- D. 1
Answer: B
NEW QUESTION 41
Refer to the code below:
new Promise((resolve, reject) => {
const fraction = Math.random();
if( fraction >0.5) reject("fraction > 0.5, " + fraction);
resolve(fraction);
})
.then(() =>console.log("resolved"))
.catch((error) => console.error(error))
.finally(() => console.log(" when am I called?"));
When does Promise.finally on line 08 get called?
- A. When resolved or rejected
- B. When rejected
- C. WHen resolved
- D. When resolved and settled
Answer: A
NEW QUESTION 42
A developer creates a simple webpage with an input filed. When a user enters text In the input field and clicks the button, the actual value of the field must be displayed in the console.
Here is the HTML file content:
The developer wrote the JavaScript code below:
When the user clicks the button, the output is always ''hello''.
What needs to be done to make this code work as expected?
- A. Replace line 04 with button.addEventListener (''onclick'', function ( ) (
- B. Replace line 04 with button, addCallback (''click'', function ( ) (
- C. Replace line 04 with const input = document. getElementByName ('input') ;
- D. Replace line 04 with console.log (input, value);
Answer: D
NEW QUESTION 43
Refer to the code below:
What value can a developer expect when referencing o,js,secondCity?
- A. 'new york'
- B. An error
- C. Undefined
- D. 'New York
Answer: A
NEW QUESTION 44
Given two expressions var1 and var2, what are two valid ways to return the logical AND of the two expression and ensure it is data type Boolean? Choose 2 answers
- A. Var1 && var2
- B. Var1. Toboolean ( ) && var2, to Boolean ( )
- C. Boolean (var1) && Boolean (var2)
- D. Boolean (var1 && var2)
Answer: B,D
NEW QUESTION 45
A developer has an ErrorMandler module that contains multiple functions.
What kind of export should be leveraged so that multiple function can be used?
- A. All
- B. default
- C. Multi
- D. Named
Answer: D
NEW QUESTION 46
Refer to the code below:
For (let number =2: number <= S; number += 1) ( // insert code statement here The developer needs to insert a code statement in the location shown. The code statement has these requirements:
1. Does not require an import
2. Logs an error when the Boolean statement evaluates to false
3. Works In both the browser and Node.js
Which statement meet these requirements?
- A. Console. Debug (number $ 2 == 0) ;
- B. Assert (number $ 2 == 0);
- C. Console. Assert ( number $ 2 == 0 ) ;
- D. Console. error (number $ 2 == 0) ;
Answer: C
NEW QUESTION 47
A team that works on a big project uses npm to deal with the project's dependencies.
A developer added a dependency to manipulated dates and pushed the updates to the remote repository. The rest of the team complains that the dependency does not get download when they execute npm install.
Which two reason could be possible explanation for this?
- A. The developer added the dependency as a dev dependency, and NOOK_ENV is set to production.
- B. The developer added the dependency as a dev dependency, and NODK_ENV is set to production.
- C. The developer missed the option -ssve when adding the dependency.
- D. The developer missed the option - add when adding the dependency.
Answer: A,B,C
NEW QUESTION 48
Refer to the code below:
01 const exec = (item, delay) =>{
02 new Promise(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. runParallel ( ). done(function(data){
return data;
}); - B. Async runParallel () .then(data);
- C. runParallel () .then(data);
- D. runParallel () .then(function(data) return data
Answer: A,D
NEW QUESTION 49
Given a value, which three options can a developer use to detect of the value is NaN?
Choose 3 answers
- A. Value == NaN
- B. Value I== value
- C. Object , is ( value, NaN)
- D. Value == Number, NaN
- E. Number , isNaN(value)
Answer: A,C,E
NEW QUESTION 50
Refer to the following code that performs a basis mathematical operation on a provided input:
How should line o2 be written to ensure that x evaluated to 6 in the line below?
Let x calculate (''g'');
- A. Return Number (num + 10) / 3;
- B. Return Number (num) + 10) / 3);
- C. Return Number (num + 10) / 3;
- D. Return integer (num + 10) / 3;
Answer: B
NEW QUESTION 51
A developer wants to use a try...catch statement to catch any error that countSheep () may throw and pass it to a handleError () function.
What is the correct implementation of the try...catch?
A)
B)
C)
D)
- A. Option
- B. Option
- C. Option
- D. Option
Answer: D
NEW QUESTION 52
A developer wants to create an object from a function in the browser using the code below.
What happens due to lack of the new keyword on line 02?
- A. Window. === name is assigned to ''hello'' and the variable a n remain undefined.
- B. The a variable is assigned the correct object.
- C. Window. n is assigned the correct object.
- D. The n variable is assigned the correct object but this- remains undefined.
Answer: A
NEW QUESTION 53
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