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Using JavaScript-Developer-I Free Practice Exams, Pass The Salesforce Certified JavaScript Developer I Exam

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Salesforce Certified JavaScript Developer I Exam Sample Questions (Q124-Q129):

NEW QUESTION # 124
A developer has the following array of student test grades:
Let arr - [7, 8, 5, 9]
How should want to double each score and then see an array of the students who scored more than 15 points.
How should the developer implement the request?

A. Let arr1 = arr.map ((num) => num + 2 .filter ((val) => val 15 );
B. Let arr1 = arr .filter ((filter ((val) => ( return val > 15 )) .map (( num => ( return num +2 ));
C. Let arr1 = arr.mapBy ((num) => return num + 2 )) .filterBy ((val) => ( return val > 15 )) ;
D. Let arr1 = arr .map ((num => ( num + 2 )) .filterBy ((val => ( val 15 )) ;

Answer: A

NEW QUESTION # 125
Which statement phrases successfully?

A. JSON.parse ( " foo " );
B. JSON.parse( " ' foo ' " );
C. JSON.parse ( ' foo ' );
D. JSON.parse(' " foo " ');

Answer: D

NEW QUESTION # 126
Refer to code below:
console.log(0);
setTimeout(() => (
console.log(1);
});
console.log(2);
setTimeout(() => {
console.log(3);
), 0);
console.log(4);
In which sequence will the numbers be logged?

A. 02413
B. 02431
C. 0
D. 01234

Answer: A

NEW QUESTION # 127
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 developer creates 1000 monster objects.
How many growl methods are created with Option A and Option B?

A. 1 methods for both
B. 1 for Option A, 1000 for Option B
C. 1000 for both
D. 1000 for Option A, 1 for Option B

Answer: A

NEW QUESTION # 128
Refer to the following array:
Let arr = [1, 2, 3, 4, 5];
Which three options result in x evaluating as [1, 2]?
Choose 3 answer

A. let x = arr. slice (2);
B. let x arr.filter((a) => (return a <= 2 });
C. let x =arr.splice(0, 2);
D. let x = arr.filter ((a) => 2 }) ;
E. let x = arr. slice (0, 2);

Answer: B,C,E

NEW QUESTION # 129
......

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