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Salesforce Certified JavaScript Developer I Exam Sample Questions (Q136-Q141):

NEW QUESTION # 136
A developer wants to create a simple image upload in the browser using the File API. The HTML is below:

The JavaScript portion is:

In lines 04 and 08, which code allows the user to select an image from their local computer, and to display the image in the browser?

• A. 04 const reader = new FileReader ( ) ;
  08 if (file) URL , createObjectURL (file) ;
• B. 04 const reader = new File ( ) ;
  08 if (file) ,reader, readerAsDataURL (file) ;
• C. 04 const reader = new File ( ) ;
  08 if (file) URL , createObjectURL (file) ;
• D. 04 const reader = new FileReader ( ) ;
  08 if (file) reader , createAsDataURL (file) ;

Answer: C
NEW QUESTION # 137
Refer to the following array:
Let arr1 = [ 1, 2, 3, 4, 5 ];

Which two lines of code result in a second array, arr2 being created such that arr2 is not a reference to arr1?

• A. Let arr2 = arr1;
• B. Let arr2 = arr1.sort();
• C. Let arr2 = Array.from(arr1);
• D. Let arr2 = arr1.slice(0, 5);

Answer: C,D
NEW QUESTION # 138
A Developer wrote the following code to test a sum3 function that takes in an array of numbers and returns the sum of the first three number in the array, The test passes:
Let res = sum2([1, 2, 3 ]) ;
console.assert(res === 6 );
Res = sum3([ 1, 2, 3, 4]);
console.assert(res=== 6);
A different developer made changes to the behavior of sum3 to instead sum all of the numbers present in the array. The test passes:
Which two results occur when running the test on the updated sum3 function ?
Choose 2 answers

• A. The line 02 assertion passes.
• B. The line 05 assertion passes.
• C. The line 02 assertion fails
• D. The line 05 assertion fails.

Answer: A,D
NEW QUESTION # 139
Refer to the code below:
let car1 = new Promise((_ ,reject)=> setTimeout(reject,2000,"Car1 crashed in")); let car2 = new Promise(resolve => setTimeout(resolve,1500,"Car2 completed")); let car3 = new Promise(resolve => setTimeout(resolve,3000,"Car3 completed")); Promise.race([car1,car2,car3])
.then(value=>{
let result = ${value} the race.;
}).catch(err=>{
console.log('Race is cancelled.',err);
});
What is the value of result when promise.race execues? Answer: ** Explanation:
Car2 completed the race.
NEW QUESTION # 140**
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 7 to ) () ;
• B. Change line 2 to console.log('Hello' , name() );
• C. Change line 9 to sayHello(world) ();
• D. Change line 5 to function world ( ) {

Answer: B
NEW QUESTION # 141
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