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.
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.)
A useful method you might want to use in some of these questions:
indexOf() which takes a single argument and returns the
index of the first occurrence of argument in the string on which the
method is called or -1 if the argument is not found. For
instance, 'foobar'.indexOf('o') returns 1
while 'foobar'.indexOf('z') returns -1.
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 upToX that takes a single string
argument and returns a string consisting of the characters of the
original string up to but not including the first 'x'.
For instance upToX('quixotic') should
return 'qui'.
Write a function named charactersAround that takes two
arguments, a string and an index into the string and returns a
string consisting of two characters, the one immediately before the
character at the given index and one and the one immediately after
the character at the given index. You can assume that those
characters exist, i.e. the index is not at the beginning or end of
the string. For instance charactersAround('programming',
4) should return 'ga'.
Write a function named middle that takes a single
string argument and returns a sting consisting of the the middle of
the argument, defined as the original string with the first and last
quarter removed. You can assume the number of characters in the
string is a multiple of four. For
instance middle('abcdefgh') should
return 'cdef'.
Write a function named pair that takes two string
arguments and returns a single string consisting of the two
arguments separated by the word and. For
instance pair('peanut butter', 'jelly') should
return peanut butter and jelly.
Write a function named containsX that takes a single
string argument and returns true if it contains
an 'x' and false if it does not. For
instance containsX('flexible') should
return true and containsX('smooth') should
return false.
Write a function named slug that takes three string
arguments and returns a “slug” consisting of the three strings
joined together with hyphens and all in lower case. For
instance slug('Foo', 'Bar', 'BAZ') would
return 'foo-bar-baz'.
Write a function named capitalize that takes a single
string argument and returns a string with the same characters but
with the first character in upper case and all remaining characters
in lower case. For instance capitalize('programming')
should return 'Programming'.
Write a function named capitalizeName that takes a
single string consisting of a first and last name separated by a
space and returns a string with the first and last name separated by
a space but capitalized using the capitalize function
you just wrote. For instance capitalizeName('fred
flintstone') should return 'Fred Flintstone'.
Note: you must use capitalize in this function to get
full credit.