JavaScript-Developer-I Free Practice Test

Which codestatement below correctly persists an objects in local Storage ?

1. A. const setLocalStorage = (storageKey, jsObject) => { window.localStorage.setItem(storageKey, JSON.stringify(jsObject));}
2. B. const setLocalStorage = ( jsObject) => { window.localStorage.connectObject(jsObject));}
3. C. const setLocalStorage = ( jsObject) => { window.localStorage.setItem(jsObject);}
4. D. const setLocalStorage = (storageKey, jsObject) => { window.localStorage.persist(storageKey, jsObject);}

Correct Answer: A

Refer to the code below:
const event = new CustomEvent(
//Missing Code
);
obj.dispatchEvent(event);
A developer needs to dispatch a custom event called update to send information about recordId.
Which two options could a developer insert at the placeholder in line 02 to achieve this? Choose 2 answers

1. A. ‘Update’ , ( recordId : ‘123abc’ (
2. B. ‘Update’ , ‘123abc’
3. C. { type : ‘update’, recordId : ‘123abc’ }
4. D. ‘Update’ , { Details : { recordId : ‘123abc’}}

Correct Answer: AD

Refer to the code below:
Let foodMenu1 =[‘pizza’, ‘burger’, ‘French fries’]; Let finalMenu = foodMenu1; finalMenu.push(‘Garlic bread’);
What is the value of foodMenu1 after the code executes?

1. A. [ ‘pizza’,’Burger’, ‘French fires’, ‘Garlic bread’]
2. B. [ ‘pizza’,’Burger’, ‘French fires’]
3. C. [ ‘Garlic bread’ , ‘pizza’,’Burger’, ‘French fires’ ]
4. D. [ ‘Garlic bread’]

Correct Answer: B

A developer implements a function that adds a few values.

Which three options can the developer invoke for this function to get a return value of 10 ? Choose 3 answers

1. A. Sum () (20)
2. B. Sum (5, 5) ()
3. C. sum() (5, 5)
4. D. sum(5)(5)
5. E. sum(10) ()

Correct Answer: CD

Refer to the code below:

Why does the function bar have access to variable a ?

1. A. Inner function’s scope
2. B. Hoisting
3. C. Outer function’s scope
4. D. Prototype chain

Correct Answer: C