JavaScript-Developer-I Valid Exam Blueprint - JavaScript-Developer-I Valid Study Notes

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q28-Q33):

NEW QUESTION # 28
Refer to the code:

Given the code above, which three properties are set pet1?
Choose 3 answers:

A. Name
B. Size
C. Owner
D. Type
E. canTalk

Answer: B,D,E

NEW QUESTION # 29
const str = ' Salesforce ' ;
Which two statements result in the word " Sales " ?

A. str.substring(0, 5);
B. str.substr(s, 5);
C. str.substr(0, 5);
D. str.substring(0, 5);

Answer: A,C

Explanation:
Comprehensive and Detailed Explanation:
* " Salesforce " indices: S(0) a(1) l(2) e(3) s(4) f(5) ...
A / C (substring(0, 5)):
* substring(start, end) returns characters from start up to but not including end.
* str.substring(0, 5) # characters at indices 0,1,2,3,4 # " Sales " .
D (substr(0, 5)):
* substr(start, length) returns length characters starting at start.
* str.substr(0, 5) # 5 chars from index 0 # " Sales " .
B is invalid because s is not defined; it should be 0. So the two correct statements are A and D.

NEW QUESTION # 30
Corrected code:
let a = " * " ;
let b = " ** " ;
// x = 3;
console.log(a);
What is displayed when the code executes?

A. undefined
B. *
C. ReferenceError: a is not defined
D. null

Answer: B

Explanation:
The correct answer is B because variable a is declared and initialized before it is printed.
let a = " * " ;
This creates a block-scoped variable named a and assigns it the string value:
" * "
The line:
// x = 3;
is a comment. JavaScript ignores comments during execution, so this line has no effect.
Then this line runs:
console.log(a);
Since a already exists and contains " * " , the console displays:
* Option A is incorrect because a is defined.
Option C is incorrect because a has an assigned value, so it is not undefined.
Option D is incorrect because a was never assigned null.
Therefore, the verified answer is B .

NEW QUESTION # 31
Refer to the code below:
01 const exec = (item, delay) =>{
02newPromise(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 () .then(data);
B. runParallel ( ). done(function(data){return data;});
C. Async runParallel () .then(data);
D. runParallel () .then(function(data)return data

Answer: B,D

NEW QUESTION # 32
A developer needs to test this functions:

Which two assert statements are valid tests for this function?

A. Console.assert(sum3 (['hello' 2, 3, 4]) NaN);
B. Console.assert(sum3 ([-3, 2]) -1) ;
C. Console.assert(sum3([0]) 0) ;
D. Console.assert(sum3((1, '2' ]) 12 );

Answer: B,D

NEW QUESTION # 33
......

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