Working with Strings
Exercise 2.3
Skim through the documentation for strings in the Ruby documentation, and look for a method that prepends one string to another string.
Using that method prepend the string "Learning " to the string "Ruby"
Exercise 2.4
Skim through the documentation for strings in the Ruby documentation, and look for a method that removes characters from a string.
Using that method turn the string "Learning Ruby" into the string "Lrnng Rb".
Exercise 2.6
There is a method that allows to justify a string, and padding it with another string.
Find that method and use it on the string "Ruby" together with "<3" so that
you get the following string back:
"Ruby<3<3<3"
We’ll admit that this is a rather creative usage of this method. Normally you’d use it to align strings to columns (e.g. so that they line up nicely when you format a table). You’ll use this method in other exercises later on.
Working with Arrays (1)
Exercise 3.3
Make a new file arrays_1-3.rb, and fill in the following line:
numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
# your code goes here
p numbers
So that you get the following output:
[2, 4, 6, 8, 10]
Read the documentation for the method select that you can use on arrays
on the Ruby documentation
Exercise 3.5
Again, copy your last file to a new file: cp arrays_1-4.rb arrays_1-5.rb,
then open this new file.
Now change your code so that you get the following output:
[10, 8, 4, 2]
Bonus: Find at least three different solutions for this last change.