Methods

Question 1

How to delete a element from the end of an array?

Answer 1

arr = [1, 2, 3]
arr.pop
=> arr = [1, 2]
POP!!!

Question 2

How to delete an element from the beginning of the array

Answer 2

arr = [1, 2, 3]
arr.shift
=> arr = [ 2, 3 ]
(Will return the value that was deleted in the terminal)

Question 3

How to Delete an element at a given position

Answer 3

arr = [1, 2, 3]
arr.delete_at(1)
=> arr = [ 1, 3 ]

Question 4

How to Delete all occurrences of a given element

Answer 4

arr = [1, 2, 3, 5, 6, 8, 5]

arr.delete(5)

=> [1, 2, 3, 6, 8]

Question 5

How to select elements that satisfy a given criteria?

Answer 5

arr = [ 3, 4, 2, 1, 2, 3, 4, 5, 6]
arr.select {|a| a > 2}
[3, 4, 3, 4, 5, 6]

Question 6

What is non destructive selection?

Answer 6

It is when the arrays remain unchanged after the selection.

Question 7

How do you permanently delete objects in an array?

Answer 7

you use the delete_if method

arr.delete_if { | a | a < value }

Question 8

How do you keep some of the objects in an array?

Answer 8

You use the .keep_if method

arr.keep_if {|a| a < value }

Question 9

What is a splat operator?

Answer 9

A Splat operator gives us the method to insert multiple arguments, without predefining them.

Question 10

What is a keyword based splat argument?

Answer 10

It is a mix between a keyword argument and a splat arguments.

Question 11

What are optional arguments?

Answer 11

Optional arguments allows you to pass in any kind of arguments and then utilize them. They can lead to misleading bugs.