Chapter 0-4

Question 1

In Ruby what is an object?

Answer 1

Literally everything integers characters, text arrays-everything.

Question 2

what does the method .even? do??

Answer 2

Returns true and false in which the method determines whether the number or variable is even or odd.

Question 3

What does the .next method do?

Answer 3

It increases the number or variable by plus one.

Question 4

What do you do if you want to see the all the methods available to the data type?

Answer 4

After the data type put .methods, to see all the available methods.

Question 5

What does the .index method do?

Answer 5

This method finds the position of the argument in the array and returns that data in the array.

Question 6

What does the method .between? do??

Answer 6

It is a method to determine if the number lies between two numbers Ex. 2.between? 1,3 Returns true.

Question 7

What does the .length method do?

Answer 7

It returns the number of characters in a string including spaces.

Question 8

What is string interpolation?

Answer 8

It is a placeholder that replaces placeholders with values they represent.

Question 9

What does the method .include? do??

Answer 9

It sorts for a certain number of characters within a string

Question 10

What does the .start_with? do??

Answer 10

It check to see if a string starts with a certain set of characters.

Question 11

What does the .end_with? method do??

Answer 11

It checks to see if a string end with a certain set of characters.

Question 12

What does the .index() method do??

Answer 12

It find a certain set of characters and returns the index of the character or characters.

Question 13

What does the methods .uppercase and .downcase do?

Answer 13

.uppercase makes the whole string captial letters and downcase puts all the lets to the standard form.

Question 14

What does the .swapcase method do?

Answer 14

Swap every character in the string to lower case to upper case and vice versa.

Question 15

What does the method .split do?

Answer 15

Returns an array for a string generally separated by a space(‘’)

Question 16

What does the .sub() method do??

Answer 16

Takes a substring from a string and replaces it with another substring. But only for the first string it encounters. .sub(old substring, new substring)

Question 17

What does the .gsub() method do?

Answer 17

Like .sub() method it replaces string with another string but all occurrences for when it is called.

Question 18

What does the .match method do?

Answer 18

converts a pattern of Regular expressions and invokes its match method on the target String method.

Question 19

What does the || and && do in Ruby programming?

Answer 19

For if else statements represents or along with and.

Question 20

How do you negate a expression?

Answer 20

Use the ! point.

Question 21

What is the ? and : used for?

Answer 21

They mean then and else respectively. ex. number>0? – : —

Question 22

What does the infinite loop look like?

Answer 22

loop do some code end

Question 23

What is the break command used for?

Answer 23

Its ends the loop including infinite loop

Question 24

How do you run a block of code N times?

Answer 24

(some number).times do end

Question 25

How does one create a new array?

Answer 25

Array.new

Question 26

How do you find data in an array?

Answer 26

[data][subdata] subdata= data that you are trying to find

Question 27

What is a reverse index lookup?

Answer 27

Array indexes can also start from the end of the array, rather than the beginning! In Ruby, this is achieved by using negative numbers.

Question 28

How does a coder increase an array?

Answer 28

after the array use

Question 29

What does .push() do?

Answer 29

Increases the array with data.

Question 30

What does the map method do?

Answer 30

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