JavaScript recursion exercises

javascript-recursion.js

// Write a recursive function that outputs the range between two positive numbers 
// myFunction(1, 5) #=> [1, 2, 3, 4, 5]
// (5 pts)


// Write a recursive function that outputs the sum of an array of integers 
// myFunction([1, 2, 3, 4, 5, 6]) #=> 21 
// (5 pts)


// Implement Ruby's `select` in JavaScript recursively. 
// Example: iterating over [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] and only returning even numbers. 
// (5 pts)


// Implement Ruby's `drop_while` in JavaScript recursively. 
// Example: iterating over [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] and only returning integers greater than 7.
// drop_while: http://ruby-doc.org/core-2.2.3/Enumerable.html#method-i-drop
// (5 pts)