Week 3 Review

Question 1

Loop over an array using “for”.

Answer 1

for (let i = 0; i < myArray.length; i++) {
  // Use myArray[i] to access each array element one by one
}

Question 2

Loop over an array using for each

Answer 2

myArray.forEach(myElement => {
  // Use myElement to access each array element one by one
});

Question 3

Loop through an array using for-of

Answer 3

for (const myElement of myArray) {
  // Use myElement to access each array element one by one
}

Question 4

Remove the 2nd, 3rd, and 4th element using splice

Answer 4

myArray.splice(1,3)

Question 5

Splice syntax

Answer 5

Splice method with index of first element and second parameter is how many elements to remove

Question 6

TF Strings are objects with methods and properties

Answer 6

True

Question 7

TF A javascript string is immutable

Answer 7

True

Question 8

Convert a string to lower case

Answer 8

myString.toLowerCase()

Question 9

Convert a string to upper case

Answer 9

myString.toUpperCase

Question 10

TF You can use == to compare two strings

Answer 10

False use ===

Question 11

Access each letter of a string

Answer 11

for (let i = 0; i < myString.length; i++) {
  Console.log(myString[1]);
}

Question 12

Access each letter of a string using for of

Answer 12

const name = "Sarah";
for (const letter of name) {
  console.log(letter);
}

Question 13

Turn a string into an array

Answer 13

const name = "Sarah";
const nameArray = Array.from(name);

Question 14

What does
const song = “Honky Tonk Women”;
console.log(song.indexOf(“Onk”));
Return

Answer 14

-1 because string not found because case mismatch

Question 15

Break a string apart into array

Answer 15

myString = ’Jan, 12’

myString.split(“,“)

Question 16

Find index of ‘r’ in string “Forrest”

Answer 16

myString = “Forrest”;

myString.indexOf(“r”);

Question 17

Object Orientated Programming or OOP is a programming ________________

Answer 17

paradigm

Question 18

A JavaScript class is defined with the ________ keyword.

Answer 18

class

Question 19

What method is called during object creation

Answer 19

constructor()

Question 20

The keyword that represents the object on which a method was called

Answer 20

this

Question 21

Objects are created from a class with the _______ operator

Answer 21

new

Question 22

Javascripts OOP model is based on ___________

Answer 22

prototypes

Question 23

When trying to access a property that does not exist in an object, JavaScript then tries to find the property by in the ________ ________

Answer 23

prototype chain

Question 24

The method used to create a link between objects through prototypes

Answer 24

Object.create()

Question 25

TF A JavaScript class can only contain methods

Answer 25

True

Question 26

Functional programing is combining functions expressing ________ to do not ___________

Answer 26

what how

Question 27

The state of a program is the value of its __________ _________ at a given time.

Answer 27

global variables

Question 28

A pure function depends solely on its ___________ for computing its outputs

Answer 28

inputs

Question 29

A ______ . _______ is achange in a program state or interaction with the outside world

Answer 29

side effect

Question 30

Given the same data, a pure function will always produce the ___________ __________

Answer 30

same result

Question 31

The __________ method takes an array as a parameter and creates a new array with the results of calling a new function

Answer 31

map()

Question 32

The ___________ method offers a way to test every element of an array against a provided function. Only elements that pass this test are added to the returned array.

Answer 32

filter()

Question 33

The _________ method applied a provided function to each array element in order to reduce it to one value.

Answer 33

reduce()

Question 34

TF JavaScript is a multi-paradigm language

Answer 34

True