Given an array of numbers, reverse the order of the numbers in the array.

Given 2 arrays of numbers, return an array that includes all numbers that appear in both arrays.

Given a string and then a single character c, write a function that will return a count equal to the number of occurences of the character c inside the string.

Given two number variables, a and b, swap the values of those two variables. Try using only 2 variables!

Given a string, check to see if that string is a palindrome. A palindrome is a string that is spelled the same both frontwards and backwards (ie, racecar)

Given an array of unique numbers and a target number, find all pairs of integers that can be summed in that array that will give the target number. If there are none return undefined. Return the pairs as an array of arrays. Note: [a,b] and [b,a] can be treated as the same thing.

Example
targetSum([5,1,6,8,3,9],14) => [ [6,8],[5,9] ] 

Given an input number n, check if n is a prime number. A prime number is only divisible by 1 and itself. If the number is prime, return true and if not return false.

Given an unsorted array of numbers, find the second largest number in that array.