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# Sample implementation of quicksort and mergesort in ruby
# Both algorithm sort in O(n * lg(n)) time
# Quicksort works inplace, where mergesort works in a new array

def quicksort(array, from=0, to=nil)
    if to == nil
        # Sort the whole array, by default
        to = array.count - 1
    end

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def maximum(numbers)
    largest = numbers.first
    index = 0

    # keep looping over every element in the array
    while index < numbers.size

        # check to see if current number is larger than the largest one so far

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The self keyword allows for access to the current object.

When you call a method on an object, such as object.method, the object receives a method message. The object will respond to the method if there is a method defined for it. Inside that method, you have access to the object via the keyword self.

When you call a method without an explicit receiving object, it just calls it on self.

If you are inside an instance method but need access to a class method, you would use self.class.method_you_want

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// Use Gists to store code you would like to remember later on
console.log(window); // log the "window" object to the console

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String.prototype.hashCode = function() {
  var hash = 0, i, chr, len;
  if (this.length == 0) return hash;
  for (i = 0, len = this.length; i < len; i++) {
    chr   = this.charCodeAt(i);
    hash  = ((hash << 5) - hash) + chr;
    hash |= 0; // Convert to 32bit integer
  }
 return hash;

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1. .config()
2. .run()
3. directive compile functions
4. controllers
5. directive link functions

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Export a database to .sql file

pg_dump -U username dbname > outfile.sql

Importing a db.sql file

psql -U username dbname < db.sql

Importing to Heroku

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git show -s --format=%ci COMMIT

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List available devices:

cordova emulate ios --list

Examples of how to select target:

cordova emulate ios --target="iPhone-4s, 9.3"
cordova emulate ios --target="iPad-Air-2, 9.3"
cordova emulate ios --target="iPhone-6s, 9.3"

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module.exports = flattenArray

/**
 * Flatten a multi-dimensional array.
 *
 * @param {Number[]} array
 */
function flattenArray(array) {
  return array.reduce((result, el) => {
    // If the element is an array, continue to flatten it.