This assessment consists of
functions you need to write involving primarily string expressions. It
is a closed book assessment. You should stay on this tab until you
are done and there should be no talking. This assessment is about how
much you understand. There are no automatic tests but you can use
the REPL to test things yourself. For example, after defining
the firstHalf function and pressing the blue arrow, you can
type firstHalf('foobar') in the repl and hit return to see if
it evaluates to the expected 'foo'.
You can move through the questions with the arrows at the upper right next
to the 1 of indicator so if you're not
sure how to write one function move on to another one and come back if you
have time at the end. I want to see how much you do know. Note: you
can also click on thingsLikeThis in these instructions and
the questions to copy them to the clipboard to avoid spelling mistakes.
(I.e. click to copy and then ⌘-v to paste wherever you want.)
Some of these functions will be much easier (even trivial) to write if you
use the indexOf method I introduced on the latest string
functions assignment. To refresh your memory, indexOf takes a
single argument, which should be a string, and returns the index at which
the sting argument first occurres in the string on which the method is
called. It returns -1 if the argument string is not found. For instance
if s is our old standby "foobar"
then s.indexOf("bar") is 3.
When you are done, please click on your Github username above and
submit a GitHub pull request of the branch
and request me as a reviewer. Doing this correctly is part of the
assessment. If you are unsure how to request a review, please ask for
help!
Write a function named firstHalf that takes a single
string argument and returns the first half of the string. (If the
string has an odd number of characters it doesn't matter whether or
not you include the extra character.) For instance the first half
of 'foobar' is 'foo' but if the argument
was 'fooquux' then either 'foo'
or 'fooq' would be acceptable return values.
Write a function named secondHalf that takes a single
string argument and returns the second half of the string. (If the
string has an odd number of characters it doesn't matter whether or
not you include the extra character.) For instance the second half
of 'foobar' is 'bar' but if the argument
was 'fooquux' then either 'quux'
or 'uux' would be acceptable return values. For maximum
style points write this function and firstHalf so
that firstHalf(s) + secondHalf(s) gives you
back s.
Write a function named upDown that takes a single
string argument and returns a string consisting of the original
string all in upper case concatenated (“smooshed together”) with the
string all in lower case. E.g. called with 'foo' it
should return 'FOOfoo'.
Write a function named firstFewEveryOther that takes a
single string argument that is at least five characters long and
returns a string consisting of just the first, third, and fifth
characters of the argument string. E.g. called
with 'foobar' it should return 'foa'.
Write a function named upDownLastCharacter that takes a
single string argument that is at least one character long and
returns a string consisting of two characters, the uppercase version
of the last character of the argument string and the lowercase
version of that same character. E.g. called with 'foo'
it should return 'Oo'.
Write a function named firstAndLast that takes a single
string argument (which will be at least two characters long) and
returns a string consisting of just the first and last characters of
the string.
Write a function named swapFrontAndBack that takes a
single string argument and returns a string consisting of the second
half of the original string followed by the first half. If the
string is an odd number of characters it doesn’t matter whether the
extra character goes with the front or the back.
As you should recall from the Pig Latin assignment, the rules of simple Pig Latin say that a word is translated into Pig Latin by taking everything up to (but not including) the first vowel and moving it to the end of word and then adding “ay” to the end.
Write a function named simplePigLatin that takes two
arguments, a string containing a single word and a number indicating
the index of the first vowel in the word, and returns the word
translated into Pig Latin.
Write a function named randomCharacter that takes a
single string argument and returns a random character from the
string. For this function you will need to use the rand
function defined at the top of the starter code.
Write a function named randomCharacterUpDown that takes
a single string argument and returns a string consisting of a single
random character repeated twice, once in upper case and then in
lower case. For this function you will need to use
the rand function defined at the top of the starter
code.
Write a function named isAllUpperCase that takes a
single string argument and returns a boolean indicating whether the
string is all upper case.
Write a function named sameIgnoringCase that takes two
string arguments and returns a boolean indicating whether they are
the same string if you ignore case differences.
Write a function named firstName that takes a single
string argument which will consist of a full name in the form first
name, a space, and the last name and returns a string containing just
the first name. You will probably want to use the indexOf
method.
Write a function named lastName that takes a single
string argument which will consist of a full name in the form first
name, a space, and the last name and returns a string containing just
the last name. You will probably want to use the indexOf
method.
Write a function named initials that takes a single
string argument which will consist of a full name in the form first
name, a space, and the last name and returns a string containing the
person's initials, i.e. the first letter of their first name followed
by the first letter of their last name. You will probably want to use
the indexOf method.