Free Salesforce JavaScript-Developer-I Exam Dumps Questions & Answers

Considering type coercion, what does the following expression evaluate to?
true + ' 13 ' + NaN

• A.  ' true13 '
• B.  ' 113NaN '
• C.  14
• D.  ' true13NaN '

A team at Universal Containers works on a big project and uses Yarn to deal with the project's dependencies.
A developer added a dependency to manipulate dates and pushed the updates to the remote repository. The rest of the team complains that the dependency does not get downloaded when they execute yarn.
What could be the reason for this?

• A.  The developer added the dependency as a dev dependency, and YARN_ENV is set to production.
• B.  The developer missed the option --add when adding the dependency.
• C.  The developer missed the option --save when adding the dependency.
• D.  The developer added the dependency as a dev dependency, and NODE_ENV is set to production.

Which statement accurately describes an aspect of promises?

• A.  Arguments for the callback function passed to .then() are optional.
• B.  In a .then() function, returning results is not necessary since callbacks will catch the result of a previous promise.
• C.  .then() cannot be added after a catch.
• D.  .then() manipulates and returns the original promise.

Refer to the code below:
01 new Promise((resolve, reject) = > {
02 const fraction = Math.random();
03 if (fraction > 0.5) reject( ' fraction > 0.5, ' + fraction);
04 resolve(fraction);
05 })
06 .then(() = > console.log( ' resolved ' ))
07 .catch((error) = > console.error(error))
08 .finally(() = > console.log( ' when am I called? ' ));
When does Promise.finally on line 08 get called?

• A.  When rejected
• B.  When resolved
• C.  When resolved and settled
• D.  When resolved or rejected

static delay = async delay = > {
return new Promise(resolve = > {
setTimeout(resolve, delay);
});
};
static asyncCall = async () = > {
await delay(1000);
console.log(1);
};
console.log(2);
asyncCall();
console.log(3);
Assume delay and asyncCall are in scope as functions.
What is logged to the console?

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