Loops and iterators Flashcards
1
Q
What is a While loop?
A
While something is true the code will run, there is a danger of infinite loops in these cases, make sure to add a increment.
Ex i= i+1
2
Q
What is the each loop?
A
The each loop is an iterator
that goes through an object and executes the code on each single object.
3
Q
What is the one line each iterator?
A
arr.each { | x | do_something x }
4
Q
What is the syntax for the each iterator?
A
arr.each do |x|
do_something x
end
5
Q
What are nested iterators?
A
nested iterators are used when you want to extract and operate on hashes and arrays with multiple objects.
6
Q
What is the select method in ruby?
A
The select method is a method that automatically iterates through a collection and retrieves the value you want.
7
Q
How do you use the select method in ruby?
A
There are three ways to use the select method in ruby:
- something.select do |x|
some_code
end”
- something.select { |x| x.some_code}
- something.select(&:some_code)
