Free Certified JavaScript Developer I Exam braindumps download (Certified JavaScript Developer I exam dumps Free)

QUESTION: 86

Refer to thefollowing code that imports a module named utils:
import (foo, bar) from `/path/Utils.js';
foo() ;
bar() ;
Which two implementations of Utils.js export foo and bar such that the code above runs without error?
Choose 2 answers

// FooUtils.js and BarUtils.js existImport (foo) from `/path/FooUtils.js';Import (boo) from ` /path/NarUtils.js';
const foo = () => { return `foo' ; }const bar = () => { return `bar' ; }export { bar, foo }
Export default class {foo() { return `foo' ; }bar() { return `bar' ; }}
const foo = () => { return `foo';}const bar = () => {return `bar'; }Export default foo, bar;

Answer(s): B,C

Show Answer Next Question

QUESTION: 87

developer creates a new web server that uses Node.js. It imports a server library that uses events and callbacks for handling server functionality. The server library is imported with require and is made available to the code by a variable named server. The developer wants to log any issues that the server has while booting up.
Given the code and the information thedeveloper has, which code logs an error at boost with an event?

Server.catch ((server) => {console.log(`ERROR', error);});
Server.error ((server) => {console.log(`ERROR', error);});
Server.on (`error', (error) => {console.log(`ERROR', error);});
Try{server.start();} catch(error) {console.log(`ERROR', error);}

Answer(s): C

Show Answer Next Question

QUESTION: 88

Refer to the following code:
function test (val) {
If (val === undefined) {
return `Undefined values!' ;
}
if (val === null) {
return `Null value! ';
}
return val;
}
Let x;
test(x);
What is returned by the function call on line 13?

Undefined
Line 13 throws an error.
`Undefined values!'
`Null value!'

Answer(s): C

Show Answer Next Question

QUESTION: 89

Which code statement below correctly persists an objects inlocal Storage ?

const setLocalStorage = (storageKey, jsObject) => {window.localStorage.setItem(storageKey, JSON.stringify(jsObject));}
const setLocalStorage = ( jsObject) => {window.localStorage.connectObject(jsObject));}
const setLocalStorage= ( jsObject) => {window.localStorage.setItem(jsObject);}
const setLocalStorage = (storageKey, jsObject) => {window.localStorage.persist(storageKey, jsObject);}

Answer(s): A

Show Answer Next Question