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Javascript Questions Set 213:

Quiz Mode

Which React hook returns a mutable ref object?

useEffect

useRef

useReducer

useState

Solution:

What is the output of the following code?

`window.alert(null == undefined)`

true

false

True

False

Solution:

How can you dispatch a synthetic event object?

dispatchEvent()

dispatch()

dispatch(Event)

eventdispatch()

Solution:

`var demo = true;`

`console.log(demo+true);`

`console.log(demo+"xyz");`

truetrue truexyz

1 Error

Error Error

1 truexyz

Solution:

The ______ method searches a string for a specified value and returns the position of the match

find()

search()

sort()

Solution:

To use the animation effect during the resizing of an image, we used the _______ property.

aspectRatio

opacity

animate

active

Solution:

The second element in the useState hook is ______________ .

none of these

a function

the current state value/initial value

an array

Solution:

Which property of an autocomplete widget is used to control the delay before the list of the autocomplete widget appears?

autofocus

delay

minLength

There is no property to control the delay.

Solution:

What is the essence of animations in JavaScript?

Changing webpages at a very fast rate

Including animations in the webpage

None of the above

Changing the properties of an element at fixed intervals of time

Solution:

Which of the following is true about the `setTimeout()` function in JavaScript?

It is used for setting the time period after which the function will be executed.

It can be used to execute functions, properties, and other code elements.

All of the above.

It takes two arguments: a function to be executed and the time delay (in milliseconds).

Javascript Questions Set 213:

Which React hook returns a mutable ref object?

Solution:

What is the output of the following code?

`window.alert(null == undefined)`

Solution:

How can you dispatch a synthetic event object?

Solution:

`var demo = true;`

`console.log(demo+true);`

`console.log(demo+"xyz");`

Solution:

The ______ method searches a string for a specified value and returns the position of the match

Solution:

To use the animation effect during the resizing of an image, we used the _______ property.

Solution:

The second element in the useState hook is ______________ .

Solution:

Which property of an autocomplete widget is used to control the delay before the list of the autocomplete widget appears?

Solution:

What is the essence of animations in JavaScript?

Solution:

Which of the following is true about the `setTimeout()` function in JavaScript?

Solution:

Related Question Sets:

Related Topics:

Javascript Questions Set 213:

Which React hook returns a mutable ref object?

Solution:

What is the output of the following code? window.alert(null == undefined)

Solution:

How can you dispatch a synthetic event object?

Solution:

var demo = true; console.log(demo+true); console.log(demo+"xyz");

Solution:

The ______ method searches a string for a specified value and returns the position of the match

Solution:

To use the animation effect during the resizing of an image, we used the _______ property.

Solution:

The second element in the useState hook is ______________ .

Solution:

Which property of an autocomplete widget is used to control the delay before the list of the autocomplete widget appears?

Solution:

What is the essence of animations in JavaScript?

Solution:

Which of the following is true about the setTimeout() function in JavaScript?

Solution:

Related Question Sets:

Related Topics:

What is the output of the following code?

`window.alert(null == undefined)`

`var demo = true;`

`console.log(demo+true);`

`console.log(demo+"xyz");`

Which of the following is true about the `setTimeout()` function in JavaScript?