JavaScript Developer I

Refer to the code below: 01 const server = require(‘server’); 02 /* Insert code here */ A developer imports a library that creates a web server. The imported library uses events and callbacks to start the servers Which code should be inserted at the line 03 to set up an...

A developer is required to write a function that calculates the sum of elements in an array but is getting undefined every time the code is executed. The developer needs to find what is missing in the code below. Const sumFunction = arr => { Return arr.reduce((result, current) => {...

Refer to the following code: 01 function Tiger(){ 02 this.Type = ‘Cat’; 03 this.size = ‘large’; 04 } 05 06 let tony = new Tiger(); 07 tony.roar = () =>{ 08 console.log(‘They’re great1’); 9 }; 10 11 function Lion(){ 12 this.type = ‘Cat’; 13 this.size = ‘large’; 14 } 15...

Refer to the code: Given the code above, which three properties are set pet1? Choose 3 answers:A . NameB . canTalkC . TypeD . OwnerE . SizeView AnswerAnswer: B,C,E

Refer to the following code: Let obj ={ Foo: 1, Bar: 2 } Let output =[], for(let something in obj{ output.push(something); } console.log(output); What is the output line 11?A . [1,2]B . [“bar”,”foo”]C . [“foo”,”bar”]D . [“foo:1”,”bar:2”]View AnswerAnswer: C

Which option is a core Node,js module?A . PathB . IosC . MemoryD . locateView AnswerAnswer: A

A developer implements and calls the following code when an application state change occurs: Const onStateChange =innerPageState) => { window.history.pushState(newPageState, ‘ ’, null); } If the back button is clicked after this method is executed, what can a developer expect?A . A navigate event is fired with a state property...

Which three statements are true about promises? Choose 3 answersA . The executor of a new Promise runs automatically.B . A Promise has a .then() method.C . A fulfilled or rejected promise will not change states .D . A settled promise can become resolved.E . A pending promise can become...

developer has a web server running with Node.js. The command to start the web server is node server,js. The web server started having latency issues. Instead of a one second turn around for web requests, the developer now sees a five second turnaround, Which command can the web developer run...

In which situation should a developer include a try .. catch block around their function call?A . The function has an error that should not be silenced.B . The function results in an out of memory issue.C . The function might raise a runtime error that needs to be handled.D...