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Salesforce Certified JavaScript Developer I Exam Sample Questions (Q160-Q165):

NEW QUESTION # 160
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

A. White box
B. Mocking
C. Black box
D. Integration

Answer: A,B

NEW QUESTION # 161
Which two console logs outputs NaN ?
Choose 2 answers

A. console.log(parseInt('two'));
B. console.log(10/ Number('5'));
C. console.log(10/0);
D. console.log(10/ ''five);

Answer: A,D

NEW QUESTION # 162
A developer has code that calculates a restaurant bill, but generates incorrect answers while testing the code:
function calculateBill (items ){
let total = 0;
total += findSubTotal(items);
total += addTax(total);
total += addTip(total);
return total;
}
Which option allows the developer to step into each function execution within calculateBill?

A. Usingthe debugger command on line 03
B. Wrapping findSubtotal in a console.log() method.
C. Using the debugger command on line 05.
D. Calling the console.trace (total) method on line 03.

Answer: C

NEW QUESTION # 163
Refer tothe code below:
const event = new CustomEvent(
//Missing Code
);
obj.dispatchEvent(event);
A developer needs to dispatch a custom event called update to send information about recordId.
Which two options could a developer insert at the placeholder in line02 to achieve this?
Choose 2 answers

A. 'Update' , '123abc'
B. 'Update' , (recordId : '123abc'(
C. { type : 'update', recordId : '123abc' }
D. 'Update' , {Details : {recordId : '123abc'}}

Answer: B,D

NEW QUESTION # 164
A developer creates an object where its properties should be immutable and prevent
properties from being added or modified.
Which method should be used to execute this business requirement ?

A. Object.const()
B. Object.lock()
C. Object.freeze()
D. Object.eval()

Answer: C

NEW QUESTION # 165
......

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