Arrays and programming styles

Question 1

zero based array

Answer 1

• the first value in an array is 0, not 1

first slot would have an idea of 0
2nd slot would have an index of 1
3rd index would have an index of 2
etc..

Question 2

array

Answer 2

a collection of values wrapped up under one named variable

Question 3

programming language with a 1 based index (1)

Answer 3

visual basic

Question 4

how to write an array in javascript (easy way)

Answer 4

var a = [ ];
a[0] = Apple;
a[1] = iPod;
a[2] = 77;

now, a[0] = Apple and so on.

Question 5

how to write an array (fast way)

Answer 5

var a = [“Apple”, “iPod”, 77]; [0] [1] [2]

Question 6

an array is often referred to as

Answer 6

a collection

Question 7

in javascript, arrays are…

Answer 7

objects

Question 8

if there are 5 items in an index, the highest # index is

Answer 8

4

0, 1, 2, 3, 4

Question 9

method

Answer 9

a function that belongs to an object

Question 10

what does the .reverse method do?

suppose:

a.reverse ( );

Answer 10

it would reverse the order of the array

Apple(0), iPad(1), 77(2)&raquo_space; 77(0), iPad(1), Apple(2)

Question 11

what does .sort method do?

suppose:

a.sort ( );

Answer 11

it would sort an array based on the rules of the programming language

alphabetical, numeric, or a mixture.

Question 12

what does .join method do?

suppose:

a.join ( );

Answer 12

returns an array separated with commas as a character string

Question 13

what does .pop method do?

suppose:

var b = a.pop ( );

Answer 13

would take the last value of an array, remove it from the array, and set b = the last value of the array that was just removed

Question 14

what does .push method do?

suppose:

a.push (123);

Answer 14

123 would be added as a new index to he array in a new index slot

Question 15

who wrote the “book” on javascript?

Answer 15

Mozilla, they own it.

Question 16

iteration

Answer 16

a loop

Question 17

mutable object

Answer 17

• an object that can mutate or change

Question 18

immutable object

Answer 18

• an object that cannot change or mutate

Question 19

in javascript, the arrays are … mutable or immutable?

Answer 19

mutable

NOTE* javascript is the exception to the rule. most programming languages do not allow you to modify arrays once they are created

Question 20

what are the benefits of immutable arrays?

Answer 20

• faster
• less prone to error – an array for a week would want 7 days or 7 values. it would never make sense to have an array for days of the week to change.

Question 21

Generally, you want your code to be (3)

Answer 21

1) readable
2) consistent
3) accepted best practice

Question 22

camelcase

Answer 22

highScore
uglyDuck
mySQL
cityNailAndSpa

The standard for variable naming in javascript

Question 23

javascript (5) best practices

Answer 23

1) use camel case for variables, functions, and methods
2) open curly braces on the same line
3) define function before you call them
4) always use semicolons at the end of your statement
5) always use var when creating a variable

Question 24

pseudocode

Answer 24

the process of writing down your code in plain english to see the problems you have to solve