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Salesforce Certified JavaScript Developer - Multiple Choice free pdf dumps & JS-Dev-101 latest study vce & Salesforce Certified JavaScript Developer - Multiple Choice test engine torrent

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q164-Q169):

NEW QUESTION # 164
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. Integration
C. Mocking
D. Black box

Answer: A,C

NEW QUESTION # 165
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. Using the debugger command on line 05.
B. Wrapping findSubtotal in a console.log() method.
C. Using the debugger command on line 03
D. Calling the console.trace (total) method on line 03.

Answer: A

NEW QUESTION # 166
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 valueof result when promise.race execues?

Answer:

Explanation:
Car2 completed the race.

NEW QUESTION # 167
Given the following code:
Let x =('15' + 10)*2;
What is the value of a?

A. 0
B. 1
C. 2
D. 3

Answer: C

NEW QUESTION # 168
GIven a value, which three options can a developer use to detect if thevalue is NaN?
Choose 3 answers !

A. Object.is(value, NaN)
B. value == NaN
C. value ! == value
D. Number.isNaN(value)
E. value === Number.NaN

Answer: B,D

NEW QUESTION # 169
......

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