Implement a linked list in Ruby
Given a string, print out frequency of use for each letter in the string.
Ex:
frequency('banana') # => { b: 1, a: 3, n: 2 }
Given a ASC sorted list of numbers, determine
Determine if all of the characters in a given string are unique.
Given a sentence as a string, get the occurrence count of the words in the sentence. Make sure to normalize the data first. (Remove punctuation, be case insensitive)
Schema should allow customer to order books through the online store.
Write a method that determines whether or not a String is a palindrome.
Given an array of integers, find the second highest integer.
Rules:
Print numbers 1..100
If number is divisible by 3, print "fizz" instead of number If number is divisible by 5, print "buzz" instead of number If number is divisible by 3 and 5, print "fizz buzz" instead of number