exercism-common-lisp/leslies-lists/HINTS.md

Hints

1. Making a new list

• Common Lisp has a rather descriptively named function for making a LIST.

2. Add things to the list.

• To add something to the beginning of a list it is idiomatic to CONStruct a new list with the item as the car and the list as the cdr. In the Hyperspec can be found a page that describes this function.

3. What's next thing(s) on the list?

• Common Lisp has a general purpose function to get an item from any index of a list.
• It also has several helpers for accessing indexes under 11
• List indexes are zero based.

4. Removing a thing from the list

• An idiomatic way to remove the first item of a list is to use a function which can separate the cdr of the list from the car of the list. In the Hyperspec one can find a page describing one of the functions to do this.

5. Bigger lists out of smaller lists

• Common Lisp has a function specifically for adding one list to front of another

6. How much longer?

• Common Lisp has an obviously named function to get the length of a list.