JavaScript

How to get access to number 8 in the following array?

const arr = [[1, 2, 3], [[5, 6, 7, 8], 9]]

• arr[[[1,0,3]]]

• arr[1][0][3]

• arr[1,0,3]

• arr[1[0[3]]

What would be the result of this?

const a = 20;

a = 10;

console.log(a)

• 10

• 20

• it would throw an error

• undefined

function getSum(a, b) {

console.log(a + b);

}

const result = getSum(10, 20);

console.log(result);

• 30

• undefined

• 0

• 10

What does map function return?

• undefined

• number

• string

• array

How to access property name on the object?

const country = {

name: 'Italy',

population: 59550000

};

• country,name

• country.name

• country['name']

• country{name}

What would the following comparison produce?

2 == "2"

• true

• false

• undefined

• error

Guess the result of this:

{foo: 'bar'} === {foo: 'bar'}

• true

• false

• I haven't learned it yet!

• undefined

How to convert number n to string?

• n+''

• n.toString()

• toString(n)

• String(n)

How many arguments does function foo accept?

const foo = (array, fn) => fn(array)

• 0

• 1

• 2

What would be the result of the following?

var arr = [1,2,3];

console.log(arr[0]);

• 1

• 2

• 3

• undefined