Cheat

Question 1

Interger

Question 2

Value , type of value

Question 3

Pi

Question 4

Operators

Question 5

NaN

Question 6

Types

Question 7

Unicode

Question 8

Unary operators

Answer 8

typeof

Question 9

Binary operators

Answer 9

Take 2 values

Question 10

NaN is not equal to NaN

Answer 10

Result of nonsensical computation and therefore not equal to result of any other nonsensical computation

Question 11

Ternary

Answer 11

Operating on 3 values

Question 12

undefined / null

Answer 12

No meaningful result

Question 13

Expression

Answer 13

Fragment of code that produces a result

Question 14

Result of prompt is always string

Question 15

Number.isNaN(theNumber)

Question 16

Function expression vs function declaration

Question 17

Arrow function

Answer 17

No parentheses when only one param. No braces if body is single expression

Question 18

Give function parameter default value

Question 19

Side effect

Question 20

Closure

Question 21

Call stack

Question 22

in operator in objects

Question 23

object.keys()

Question 24

object.assign(objectA, objectB)

Answer 24

Copies properties from one object to the other

Question 25

String, number boolean are not objects

Question 26

zeropad method

Question 27

padstart method

Question 28

Spread used for array argument

Question 29

Higher Order Function

Answer 29

Functions that operate on other functions by taking them as arguments or returning them

Question 30

forEach

Answer 30

The forEach() method calls a function for each element in an array.

The forEach() method is not executed for empty elements.

Question 31

finctionName.name

Question 32

arr.forEach(item => {})

Question 33

Objects curly braces and dot notation

Question 34

Object functional instantiation

Question 35

Objects functional instantiation with shared methods

Question 36

ParseInt ParseFloat

Answer 36

Parse strings into numbers

Question 37

while (true) ….

Question 38

For…..in
Iterate over object keys

Question 39

82 5 mins

Question 40

Default params

Answer 40

Function func(x, y = 1)

Question 41

Spread for function calls

Question 42

Spread in Array literals

Question 43

Spread Object literals

Question 44

Rest parameter

Question 45

Destructuring Arrays

Answer 45

-Unpack values from arrays
-Unpack properties from objects

const arr = [‘hans’, ‘sophie’, ‘kiki’, ‘madde’];

const [father, daughter1, daugther2] = arr
const [father, , daugther2] = arr
const [father, …others] = arr

Question 46

Destructuring Objects

Answer 46

obj = {
fname: ‘hans’,
lname: ‘de feber’
}

const {fname, lname} = obj

const {fname: firstName, lname: lastName} = obj