Instructions
Write a function hide_inside that consumes a list, an item, and
a nonnegative integer pos.
Your function should produce a new
list that contains all the items of the input list with the new item
inserted in position pos. For example,
hide_inside(["a", "b"], "cat", 1)
will produce
["a", "cat", "b"]. If pos is greater than the length of
the list, the item should appear at the end of the list. For example,
hide_inside(["a", "b"], "cat", 20)
will produce ["a", "b", "cat"].
Note:
Hints:
- Remember that when you use slice, the element in the second position listed is not part of the output.
Write a function replace that consumes a list, an item old, and an item new and mutates the list by replacing old by new.
If the item old is not in the list, the list should not change.
You can assume that all items in the input are distinct (that is, none
are the same as any others).
Note:
Hint:
- Remember that there will be an error if the function 'index' is used for an element not in the list.
Write a function move_to_front that consumes a list and an item and mutates the list by removing the item from its location in the list and making it the first element. If the item is not in the list, the list should not change. You can assume that all items in the input are distinct.
Note:
Hints:
- undefined
Write a function max_diff that consumes a nonempty list of numbers and produces the maximum difference between any two elements in the list. Do not sort the list.
Note:
Hints:
- The maximum difference is between the maximum and minimum values in the list.
Modify your function to use sorting. It should not change the input.
Note:
Hints:
- undefined
Write a function shift that makes a cyclic shift of a list. That is, it mutates the list so that what was the first element is now the last element, what was the second element is now the first element, what was the third element is now the second element, and so on.
Note:
Hints:
- undefined
Making use of the lists provided, write a function two_digit_word that consumes a two-digit number and produces a string giving the number in words. For example, on the input 25 the function should produce the string "twenty-five".
Note:
Hints:
- You may wish to use quotient and remainder.