/2021-03-09-midterm

Primary LanguageJavaScript

Term 1 - Midterm Exam

Welcome to the Term 1 midterm exam. This test will begin at 10:40am (or earlier) and end at 3:00pm. Please take a one hour break from 1:00pm - 2:00pm to eat lunch, rest your brain, and come back to the exam with a fresh set of eyes. As usual, you can run the tests with the jest command.

Tips

  • You may use the internet to look up anything you want (string methods, array methods, etc.)
  • If you're feeling stuck, skip it!
  • It's okay if you don't finish
  • You can go in any order
  • It's better to show a little work on each problem than a lot of work on one problem
  • Relax and have fun!

Problems

Problem 1: ageToAbilities

Write a function, ageToAbilities that takes a person's age and returns a message of their abilities according to the table below:

┌──────────┬────────────────────────────────────┐
│ age      │ message                            │
├──────────┼────────────────────────────────────┤
│ under 16 │ 'You can't drive.'                 │
│ 16 to 17 │ 'You can drive but not vote.'      │
│ 18 to 24 │ 'You can vote but not rent a car.' │
│ 25 plus  │ 'You can do pretty much anything.' │
└──────────┴────────────────────────────────────┘

Examples

ageToAbilities(10) => 'You can't drive.'
ageToAbilities(25) => 'You can do pretty much anything.'

Problem 2: oddIndices

Write a function, oddIndices, that takes in an array of numbers and returns only the ones that are located at odd indices (indices is plural of index). Recall that the index of the first value in an array (or string) is 0.

Examples

oddIndices([0, 2, 4, 6, 8, 10]) => [2, 6, 10]
oddIndices([1]) => []
oddIndices([100, 101, 102]) => [101]

Problem 3: numOddValues

Write a function, numOddValues, that takes in an array of numbers and returns the quantity of odd values in that array.

Examples

numOddValues([0, 1, 2, 3]) => 2
numOddValues([5, 5, 5, 5]) => 4
numOddValues([]) => 0

Problem 4: averageStringLength

Write a function, averageStringLength, that takes in an array of strings and returns the average length of the strings. An average is calculated by first summing X values, then dividing the sum by X.

Examples

averageStringLength(['oh', 'hello']) => 3.5
averageStringLength([]) => 0
averageStringLength(['a', 'pleasant', 'string']) => 5

Problem 5: firstPunctuationIndex

Write a function, firstPunctuationIndex, that returns the index of the first appearance of a period, question mark, or exclamation mark in the given string. If none are found, return -1.

Examples

firstPunctuationIndex('wow! goodness me.') => 3
firstPunctuationIndex('I love taking tests?') => 19
firstPunctuationIndex('...hello?') => 0
firstPunctuationIndex('alright alright alright') => -1

Problem 6: getPlace

Write a function, getPlace, that takes in two parameters, a sorted list of high scores (highest first, loweset last) and a new score. The function should return a human readable string indicating which place the new score fits into the given list of high scores.

Note 1: You are not required to insert score into the highScores array

Note 2: We will assume that the new score is not already in the high scores array so that we don't have to handle ties

Examples

getPlace([60, 30, 10], 90)     => '1st place'
getPlace([60, 30, 10], 50)     => '2nd place'
getPlace([60, 30, 10], 15)     => '3rd place'
getPlace([500, 300, 200], 100) => '4th place'