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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q138-Q143):

NEW QUESTION # 138
Refer to the code below:

What is display when the cod executes?

A. null
B. Undefined
C. ReferenceError: b is not defined
D. A

Answer: D

NEW QUESTION # 139
A developer is leading the creation of a new web server for their team that will fulfill API requests from an existing client.
The team wants a web server that runs on Node.Js, and they want to use the new web framework Minimalist.Js. The lead developer wants to advocate for a more seasoned back-end framework that already has a community around it.
Which two frameworks could the lead developer advocate for?
Choose 2 answers

A. Gatsby
B. Angular
C. Express
D. Koa

Answer: A,B

NEW QUESTION # 140
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 # 141
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 ( ). done(function(data){return data;});
B. runParallel () .then(function(data)return data
C. runParallel () .then(data);
D. Async runParallel () .then(data);

Answer: A,B

NEW QUESTION # 142
Given the following code:

What is the output of line 02?

A. "null"
B. "x-
C. 'object"
D. "undefined" 0

Answer: C

NEW QUESTION # 143
......

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