Operations on lists

A.4 Operations on lists

word word1 word2

Concatenates the two words word1 and word2.

Eg: pr word "a 1 returns a1

list arg1 arg2

Returns a list composed of arg1 and arg2.

For example, list 3 6 returns [3 6].

list “a “list returns [a list]

sentence, se arg1 arg2

Returns a list composed of arg1 and arg2. If arg1 or arg2 is a list, then each element of arg1 and arg2 will become an element of the resulting list (square brackets are deleted).

Eg: se [4 3] “hello returns [4 3 hello]

se [how are] “things returns [how are things]

fput arg1 list2

Insert arg1 in the first slot in list2.

Eg : fput “cocoa [2] returns [cocoa 2]

lput arg1 list2

Insert arg1 in the last slot of list2.

Eg: lput 5 [7 9 5] returns [7 9 5 5]

reverse list

Reverse the order of elements in list.

reverse [1 2 3] returns [3 2 1]

pick arg1

If arg1 is a word, returns one of the letters of arg1 at random.
If arg1 is a list, returns one of the elements of arg1 at random.

remove arg1 list2

Remove element arg1 from list list2 if it occurs there.

Eg: remove 2 [1 2 3 4 2 6 ] returns [1 3 4 6]

item n arg2

If arg2 is a word, returns the letter numbered n from the word (1 represents the first letter).
If arg2 is a list, returns the element numbered n from the list.

butlast, bl arg1

If arg1 is a list, returns the whole list except for its last element.
If arg1 is a word, returns the word minus its last letter.

butfirst, bf arg1

If arg1 is a list, returns the whole list except for its first element.
If arg1 is a word, returns the word minus its first letter.

last arg1

If arg1 is a list, returns the last element of the list.
If arg1 is a word,returns the last letter of the word.

first arg1

If arg1 is a list, returns the first element of the list.
If arg1 is a word,returns the first letter of the word.

setitem, replace list1 n arg3

Replace the element number n in the list list1, by the word or the list arg3.

replace [a b c] 2 8 –-> [a 8 c]

additem list1 n arg3

Adds at the position n in the list list1 the word or the list arg3

additem [a b c] 2 8 –-> [a 8 b c]

count arg1

If arg1 is a word, returns the number of letters in arg1.
If arg1 is a list, returns the number of elements in arg1.

unicode word1

returns the Unicode value of the character word1.

pr unicode "A returns 65

character,char n

Returns the character which Unicode value is n.

pr character 65 returns "A