Online Access Free JS-Dev-101 Practice Test

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?

• A.Next
• B.Next.js
• C.Gatsby
• D.Angular

Given a value, which two options can a developer use to detect if the value is NaN?

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

Given the following code:
01 let x = null;
02 console.log(typeof x);
What is the output of line 02?

• A."undefined"
• B."object"
• C."null"
• D."x"

Refer to the code below:
let strNumber = '12345';
Which code snippet shows a correct way to convert this string to an integer?

• A.let numberValue = (number) textValue;
• B.let numberValue = textValue.toInteger();
• C.let numberValue = Integer(strNumber);
• D.let numberValue = Number(strNumber);

Refer to the code below (assuming Promise.race is intended):
let cat3 = new Promise(resolve =>
setTimeout(resolve, 3000, "Cat 3 completes")
);
Promise.race([cat1, cat2, cat3])
.then(value => {
let result = `${value} the race.`;
})
.catch(err => {
console.log("Race is cancelled:", err);
});
(Assuming cat1 and cat2 are similar to earlier examples: cat2 resolves fastest.) What is the value of result when Promise.race executes?

• A.Race is cancelled.
• B.Car 1 crashed on the race.
• C.Car 3 completed the race.
• D.Car 2 completed the race.