ALL

Question 1

7 data types

Answer 1

numbers, strings, boolean, objects, arrays, null, undefined

Question 2

strings

Answer 2

words

Question 3

what is interpolation

Answer 3

back ticks ``

Question 4

interpolation operators

Answer 4

${}

Question 5

how to combine text

Answer 5

“word” + “word”

Question 6

Boolean

Answer 6

conditional statement if this do this

Question 7

what is falsey data

Answer 7

false, null, undefined,null, 0, NaN, empty “ “

Question 8

Strict Equality operators

Answer 8

===

Question 9

strict inequality operators

Answer 9

!==

Question 10

3 logical operators

Answer 10

Not (!), And (&&), Or(||)

Question 11

tenary expressions

Answer 11

if then statement

Question 12

tenary structure

Answer 12

value/condition ? return if true : return if false

Question 13

Variable Declaration

Answer 13

a statement: const cat=”rose”

Question 14

2 code statements

Answer 14

Selection and Repetition

Question 15

Selection statement

Answer 15

if, else, else if

Question 16

if statement structure

Answer 16

if (condition) {
thing to do if true
}

Question 17

else statement structure

Answer 17

if (condition) {
thing to do if true
} else {
thing to do if false
}

Question 18

if else

Answer 18

if (condition) {
thing to do if true
} else if (condition 2) {
thing to do if condition 2 is true}

Question 19

switch statement

Answer 19

alternate for conditional statement with multiple conditions again same value

Question 20

switch statement structure

Answer 20

switch (expression) {
case value1:
//Statements executed when the
//result of expression matches value1
[break;]
case value2:
//Statements executed when the
//result of expression matches value2
[break;]
…
case valueN:
//Statements executed when the
//result of expression matches valueN
[break;]
[default:
//Statements executed when none of
//the values match the value of the expression
[break;]]
}

Question 21

Default

Answer 21

set of statements to run after all of the switch statement cases have been checked

Question 22

Break

Answer 22

stop switch statement from continuing to look at case statements once it finds a match

Question 23

logging

Answer 23

process of printing information about the program as it runs. example: console.log

Question 24

Repetition statement

Answer 24

while

Question 25

while loop structure

Answer 25

while (condition) { do if condition is true }

Question 26

increment/decrement operators

Answer 26

add ++ or += subtract -- or -=

Question 27

terminate while loop naturally

Answer 27

let count = 0 while (count <3){ return ${count}; count = count++ }

Question 28

function structure

Answer 28

function functionName (parameter) { code to run when function is called }

Question 29

parameter

Answer 29

placeholder for argument that will get passed through

Question 30

return

Answer 30

statement ends function execution and specifies a value to be returned to the function caller

Question 31

parseInt()

Answer 31

turns number inside " " from strings into numbers

Question 32

2 Data Structures

Answer 32

Array and Objects

Question 33

Arrays

Answer 33

collections of values in ordered lists

Question 34

Elements

Answer 34

individual pieces of data inside an array

Question 35

index

Answer 35

number that identify each element in array

Question 36

object

Answer 36

list of values using key and value

Question 37

array structure

Answer 37

const arrayName = [ data, data ]

Question 38

.length

Answer 38

finds the number of elements in an array

Question 39

what is the index of the first element in an array

Answer 39

0

Question 40

how to update an array

Answer 40

arrayName[index] = "no element"

Question 41

destructive mutability

Answer 41

methods update or mutate the object

Question 42

nondestructive mutability

Answer 42

doesn't change the value

Question 43

Array methods

Answer 43

ways to add, remove and change elements

Question 44

add elements destructively to array

Answer 44

.push() and .unshift()

Question 45

add elements to array non destructively

Answer 45

spread operator ...

Question 46

.push ()

Answer 46

add to end of array

Question 47

.unshift ()

Answer 47

add to beginning of array

Question 48

spread operator

Answer 48

... creates a copy of the original array to be changed l

Question 49

structure to use spread to add to beginning of array

Answer 49

const newArray = ["new element", ... oldArray]

Question 50

structure to spread to add to end of array

Answer 50

const newArray = [ ... oldArray, "new element"]

Question 51

remove elements from aray

Answer 51

.pop(), ,shift(), .slide()

Question 52

.pop()

Answer 52

removes last element destructively

Question 53

.shift()

Answer 53

removes first element destructively

Question 54

.slice ()

Answer 54

makes copy of removed indexes in parameter

Question 55

.slice () strucutre

Answer 55

array.slice(index to start number after this index will be removed, index to end slice)

Question 56

.splice structure

Answer 56

array.splice(start index, delete count, element to add)

Question 57

object structure

Answer 57

const objectName = { key 1: value 1, key 2 : value 2, };

Question 58

access value in object

Answer 58

dot notation, bracket notation

Question 59

dot notation

Answer 59

objectName. key

Question 60

bracket notation

Answer 60

objectName["key"]

Question 61

object.keys ()

Answer 61

pulls all of the keys at the top level of object

Question 62

What does object.values return?

Answer 62

returns the object values

Question 63

adding property to object with dot notation

Answer 63

object.key = new value

Question 64

adding property to object with bracket notation

Answer 64

object ["key"] = new value

Question 65

structure to use spread to add to object

Answer 65

function nondestructive (object, key,value) { const newObject = {...oldObject}; newObject["key"] = value; return newObject; }

Question 66

remove a property

Answer 66

delete object.key

Question 67

debugging in Node

Answer 67

add debugger keyword where you want a breakpoint

Question 68

for loop structure

Answer 68

for (initialization; condition; iteration) { loop body }

Question 69

initialization

Answer 69

counter values. let age=30

Question 70

condition

Answer 70

expression evaluated before each pass through. age<40

Question 71

iteration

Answer 71

what happens at the end of each loop through. age++

Question 72

loop body

Answer 72

code that runs on each pass through

Question 73

while loop

Answer 73

while (condition) { loop body }

Question 74

looping

Answer 74

process of executing a set of statements repeatedly until a condition is met

Question 75

iteration

Answer 75

process of executing a set of statements once for each element

Question 76

for ... of structure

Answer 76

const myArray =[ ]; for (const element of myArray) { console.log(element); }

Question 77

for... of for array or object?

Answer 77

array

Question 78

for... in for array or object

Answer 78

object

Question 79

for... in strucutre

Answer 79

for( const key in object) { console.log(key); }

Question 80

function expression

Answer 80

const name = function () { return " "; }

Question 81

anonymous functions

Answer 81

no assigned identifier (no function name)

Question 82

Scope

Answer 82

what you can access it and where you can access it

Question 83

levels of scope

Answer 83

Global- highest level Functional - in function block - if then in function

Question 84

hoisting

Answer 84

call function before a function

Question 85

what are first class functions

Answer 85

functions as variables

Question 86

while in a function

Answer 86

function functionName (parameter) { let i=0(intiatlization); while(condition){ console.log(); i++ (iteration); }

Question 87

iterating methods

Answer 87

find() filter() map() reduce()

Question 88

.find()

Answer 88

find single element that meets condition

Question 89

.filter()

Answer 89

find and returning a list that meets a condition

Question 90

.map()

Answer 90

modifying each element and return modify array

Question 91

.reduce()

Answer 91

creating summary (adds all of the elements together)

Question 92

pure function

Answer 92

function when invoked with the same arguments will always return the same results

Question 93

impure function

Answer 93

functions when invoked with the same arguments will return different results

Question 94

arrow function structure

Answer 94

const name = (parameter, parameter) => function body

Question 95

arrow function with 1 parameter

Answer 95

const name = parameter=> function body

Question 96

callback function

Answer 96

function called into another function

Question 97

callback function stucture

Answer 97

function main(cb) { console.log (cb()); } main(function(){return "Hi"})

Question 98

.forEach

Answer 98

executes function once for each array element.

Question 99

When to use .forEach

Answer 99

-iterate through to log values -directly mutate array we iterate though

Question 100

structure to destruction of objects

Answer 100

let object = { key1 = value 1, key2 = value 2, } const{first, second} = object console.log(first) //value1

Question 101

structure to destruction of array

Answer 101

const array =[data1, data2,data3] const [first, second, third] = array console.log(first,second, third) // data1, data2, data3

Question 102

structure destruction of strings

Answer 102

const name= "Rachel J Hamby" const [firstName, middle, lastName] = name.split(" ") console.log(firstName) // Rachel

Question 103

.querySelectorALL()

Answer 103

takes a string containing 1 or more class selectors and returns a collection of all matching elements

Question 104

.querySelector()

Answer 104

take a string of 1 or more CSS compatible selectors and returns the first element that matches

Question 105

what is used to describe DOM structure

Answer 105

a tree

Question 106

Metadata

Answer 106

the class/id attributes that provide information about the node (the words in <> )

Question 107

.getElementByClassName('class')

Answer 107

returns an array of all the elements with that class

Question 108

.getElementByTagName('tag')

Answer 108

returns all the elements with a particular tag

Question 109

.getElementByID('id')

Answer 109

returns the element with specific id

Question 110

where should you put