Free Salesforce Certified JavaScript Developer I Exam Javascript-Developer-I Exam Practice Test

Given the code below:const delay = sync delay => {Return new Promise((resolve, reject) => {setTimeout (resolve, delay);});};const callDelay =async () =>{const yup =await delay(1000);console.log(1);What is logged to the console?

• 1 2 3
• 1 3 2
• 2 1 3
• 2 3 1

developer removes the HTML class attribute from the checkout button, so now it issimply:<button>Checkout</button>.There is a test to verify the existence of the checkout button, however it looks for a button withclass= ''blue''. The test fails because no such button is found.Which type of test category describes this test?

• True positive
• True negative
• False positive
• False negative

Teams at Universal Containers (UC) work on multiple JavaScript projects at the same time.UC is thinking about reusability and how each team can benefit from the work of others.Going open-source or public is not an option at this time.Which option is available to UC with npm?

• Private packages can be scored, and scopes can be associated to a private registries.
• Private registries are not supported by npm, but packages can be installed via URL.
• Private packages are not supported, but they can use another package manager like yarn.
• Private registries are not supported by npm, but packages can be installed via git.

Which statement phrases successfully?

• JSON.parse ( ' foo ' );
• JSON.parse ( '' foo '' );
• JSON.parse( '' ' foo ' '' );
• JSON.parse(' '' foo '' ');

Refer to the code below:Let car1 = new Promise((_ , reject) =>setTimeout(reject, 2000, ''car 1 crashed in'' =>Let car2 =new Promise(resolve => setTimeout(resolve, 1500, ''car 2 completed'')Let car3 =new Promise(resolve => setTimeout(resolve, 3000, ''car 3 completed'')Promise.race(( car1, car2, car3)).then (value => (Let result = '$(value) the race.';)}.catch(arr => {console.log(''Race is cancelled.'', err);});What is the value of result when Promise.race executes?

• Car 3 completes the race
• Car 2 completed the race.
• Car 1 crashed in the race.
• Race is cancelled.

Refer to the code below:Const resolveAfterMilliseconds = (ms) => Promise.resolve (setTimeout (( => console.log(ms), ms ));Const aPromise = await resolveAfterMilliseconds(500);Const bPromise = await resolveAfterMilliseconds(500);Await aPromise, wait bPromise;What is the result of running line 05?

• aPromise and bPromise run sequentially.
• Neither aPromise or bPromise runs.
• aPromise and bPromise run in parallel.
• Only aPromise runs.

Refer to the code below:function foo () {const a =2;function bat() {console.log(a);}return bar;}Why does the function bar have access to variable a ?

• Inner function's scope
• Hoisting
• Outer function's scope
• Prototype chain

A developer is setting up a Node,js server and is creating a script at the root of the source code, index,js, that will start the server when executed. The developer declares a variable that needs the folder location that the code executes from.Which global variable can be used in the script?

• window.location
• _filename
• _dirname
• this.path

Refer to the code below:Let inArray =[ [ 1, 2 ] , [ 3, 4, 5 ] ];Which two statements result in the array [1, 2, 3, 4, 5] ?Choose 2 answers

• [ ]. Concat.apply ([ ], inArray);
• [ ]. Concat (... inArray);
• [ ]. concat.apply(inArray, [ ]);
• [ ]. concat ( [ ....inArray ] );

A developer writers the code below to calculate the factorial of a given number.Function factorial(number) {Return number + factorial(number -1);}factorial(3);What is the result of executing line 04?

• 0
• 6
• -Infinity
• RuntimeError