JSON was a native construct of which language

1.  PHP

2.  Java

3.  Ruby On Rails

4.  Javascript

View Answer  
4
Correct Answer :

Javascript


Explanation :
No Explanation available for this question

var declares a block-scoped variable

1.  true

2.  false

View Answer  
2
Correct Answer :

false


Explanation :
No Explanation available for this question

const declares a block-scoped variable

1.  true

2.  false

View Answer  
2
Correct Answer :

true


Explanation :
No Explanation available for this question

let declares a block-scoped variable

1.  true

2.  false

View Answer  
2
Correct Answer :

true


Explanation :
No Explanation available for this question

What is the final value of obj in the following example const obj = { foo: 1 } obj.bar = 2  

1.  { foo: 1 }

2.  N/A, the above throws an error

3.  { foo: 1, bar: 2 }

4.  { foo: 1, 2: bar }

View Answer  
4
Correct Answer :

{ foo: 1, bar: 2 }


Explanation :
No Explanation available for this question

Which of the following statements is not true about this example const obj = { outer: function() { const self1 = this const inner1 = () => { const self2 = this const inner2 = () => { const self3 = this } } } }  

1.  self1 === self3

2.  self2 === self3

3.  self1 === self2

4.  self2 !== self3

View Answer  
4
Correct Answer :

self2 !== self3


Explanation :
No Explanation available for this question

What would be the constructor of roger in the example below class Animal { constructor(noise) { this.noise = noise } speak() { console.log(this.noise) } } class Dog extends Animal { constructor(size) { super('bark!') this.size = size } } const roger = new Dog('large')  

1.  Animal

2.  Dog

3.  Object

4.  Function

View Answer  
4
Correct Answer :

Dog


Explanation :
No Explanation available for this question

What is the result of the following const speed = 'quick' `The ${speed} brown fox jumps over the lazy dog.`  

1.  TypeError

2.  SyntaxError

3.  'The speed brown fox jumps over the lazy dog.'

4.  'The quick brown fox jumps over the lazy dog.'

View Answer  
4
Correct Answer :

'The quick brown fox jumps over the lazy dog.'


Explanation :
No Explanation available for this question

What is the final value of array below const array = [1, 2, 3] const extension = [4, 5, 6] array = [...extension, ...array]  

1.  [1, 2, 3]

2.  [1, 2, 3, 4, 5, 6]

3.  [4, 5, 6, 1, 2, 3]

4.  Uncaught TypeError: Assignment to constant variable.

View Answer  
4
Correct Answer :

Uncaught TypeError: Assignment to constant variable.


Explanation :
No Explanation available for this question

(function(x, f = () => x) { var x; var y = x; x = 2; return [x, y, f()]; })(1)  

1.  [2, 1, 1]

2.  [2, undefined, 1]

3.  [2, 1, 2]

4.  [2, undefined, 2]

View Answer  
4
Correct Answer :

[2, 1, 1]


Explanation :
No Explanation available for this question
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