Mapping - it's string-building for arrays!

Kind of like "Tinder for ____", but... less Silicon Valley.

This is your typical test-run assignment. jest --watch-all is your friend!

• Now that we're not dealing with strings as our main focus--we'll be using strings, but focusing overall on the arrays that hold them--, let's open things up to using string methods. You should find .slice and .indexOf (the string version, not the array version) particularly useful. A little research is your friend on this!
• Also useful: Math.abs, which takes in a number and gives you back its absolute value. Check it out!
• But do not use ANY array methods. Particularly .map-- that' the one we're doing manually here, after all!

• doubleAll - returns all numbers but doubled from the given array
  • doubleAll([1, 2, 3, 4]) -> [2, 4, 6, 8]
  • doubleAll([-5, 101, 0, 32.5]) -> [-10, 202, 0, 65]
• yelledGreetings - returns the same strings but with exclamation points appended from the given array
  • yelledGreetings(['hello', 'there', 'you absolute fiend']) -> ['hello!', 'there!', 'you absolute fiend!']
  • yelledGreetings(['hey', 'you']) -> ['hey!', 'you!']
• absoluteValues - returns the absolute values of all numbers in the given array
  • absoluteValues([-1, -3, 1000]) -> [1, 3, 1000]
  • absoluteValues([1, -5, 100]) -> [1, 5, 100]
• upperCaseFirstLetters - returns a version of each string in the given array where the first letter has been capitalized
  • upperCaseFirstLetters(['colin', 'mesuara', 'genghis', 'pak', 'ginny', 'michael', 'tenzin']) -> ['Colin', 'Mesuara', 'Genghis', 'Pak', 'Ginny', 'Michael', 'Tenzin']
  • upperCaseFirstLetters(['cOlin', 'geNghis', 'mesUara', 'ginny', 'michael', 'pak', 'tenzin']) -> ['Colin', 'Genghis', 'Mesuara', 'Ginny', 'Michael', 'Pak', 'Tenzin']
• changeToInitials - returns the first letters from each word in the given array
  • changeToInitials(['Colin Jaffe', 'Mesuara Kaleziq']) -> ['CJ', 'MK']
  • changeToInitials(['Larry Bird', 'Robert Parrish']) -> ['LB', 'RP']
• doubleOdd - returns the numbers from the given array untouched, except for odd numbers (positive or negative), which it doubles
  • doubleOdd([1, 2, 3, 4, 101, 0, 32.5]) -> [2, 2, 6, 4, 202, 0, 32.5]
  • doubleOdd([-5, -1, -100, -2]) -> [-10, -2, -100, -2]
• add1ToLeft - returns the numbers from the given array but with 1 added to the left side of each
  • add1ToLeft([1, 2, 30, 400]) -> [11, 12, 130, 1400]
  • add1ToLeft([-1, -50]) -> [-11, -150]