  Navigation Name Rascal/Libraries/Prelude/List Synopsis Library functions for lists. Description For operators on lists see Values/List. The following functions are available for lists: delete: Delete an element from a list. distribution: Get the distribution of the elements of the list. That is how often does each element occur in the list? drop: Drop elements from the head of a list. dup: Remove multiple occurrences of elements in a list. The first occurrence remains. getOneFrom: Pick a random element from a list. head: Get the first element(s) from a list. headTail: Split a list in a head and a tail. index: A list of legal index values of a list. indexOf: Index of first occurrence of an element in a list. insertAt: Insert an element at a specific position in a list. intercalate: Join a list of values into a string separated by a separator. isEmpty: Test whether a list is empty. itoString: Convert a list to an indented string. last: Return the last element of a list, if any. lastIndexOf: Return index of last occurrence of elt in lst, or -1 if elt is not found. mapper: Apply a function to all list elements and return list of results. max: Determine the largest element in a list. merge: Merge the elements of two sorted lists into one list. min: Determine the smallest element in a list. mix: Mix the elements of two lists. permutations: Compute all permutations of a list. pop: Pop top element from list, return a tuple. prefix: Return all but the last element of a list. push: Push an element in front of a list. reducer: Apply a function to successive elements of list and combine the results (deprecated). reverse: Reverse a list. size: Determine the number of elements in a list. slice: Compute a sublist of a list. sort: Sort the elements of a list. split: Split a list into two halves. sum: Sum the elements of a list. tail: Get the tail element(s) from a list. take: Get number of elements from the head of a list. takeOneFrom: Remove an arbitrary element from a list, returns the element and the modified list. takeWhile: Take elements from the front of the list as long as a predicate is true. toMap: Convert a list of pairs to a map; first elements are associated with a set of second elements. toMapUnique: Convert a list of tuples to a map; result must be a map. top: Take the top element of a list. toRel: Convert a list to a relation. toSet: Convert a list to a set. toString: Convert a list to a string. unzip: Make a pair (triple) of lists from a list of pairs (triples). upTill: Returns the list 0,1..n-1. zip: Make a list of pairs from two (three) lists of the same length. Questions Question .  Fill in the missing function name. `(["Saffron", "Luke Skywalker", "Pineapple", "H", "Fig", "Han Solo"], "Saffron") == 0` Question .  Fill in the missing function name. `([15, -1, -8, 14, 7], 2, 9) == [15,-1,9,-8,14,7]` Question .  Fill in the missing function name. `(";", [5, -14, 5]) == "5;-14;5"` Question .  Fill in the missing function name. `([-1, -3, 10]) == [0,1,2]` Question .  Fill in the missing function name. `([7, 13]) == 7` Question .  Fill in the missing function name. `(["Countess Darling Von Darling", "Lemon", "Luke Skywalker", "Little Bird", "Anise", "S"]) == "S"` Question .  Fill in the missing function name. `(["Prince Charming", "Mandarin"]) == {"Mandarin","Prince Charming"}` Question .  Fill in the missing function name. `(1, [false, false, true, false, false, false]) == [false]` Question .  Fill in the missing function name. `(["K", "Pepper", "Saffron", "S", "Countess Darling Von Darling", "Pomegranate"],2) == ["Countess Darling Von Darling","Pomegranate"]` Question .  Fill in the missing function name. `(["Joh Yowza", "Barkley the Dog", "N"]) == <"Joh Yowza",["Barkley the Dog","N"]>` Question .  Fill in the missing function name. `([15,-8,-8,15,-19,-16,-4,-8,15]) == [15,-8,-19,-16,-4]` Question .  Fill in the missing function name. `([1, -19]) == -19` Question .  Fill in the missing function name. `(0, [-16, 2, 4, -4]) == [-16,2,4,-4]` Question .  Fill in the missing function name. `([-17, -13, -13]) == [-13,-13,-17]` Question .  Fill in the missing function name. `(["R","Luke Skywalker","Mango","Mango","Luke Skywalker","R"], "Mango") == 3` Question .  Fill in the missing function name. `(["Cayenne", "V", "Basil"]) == [0,1,2]` Question .  Fill in the missing function name. `([-8, 10, -4]) == <-8,[10,-4]>` Question .  `([18, 1, -11, -7, -10, -17]) == 18` Question .  Fill in the missing function name. `([-7, -19], bool(int x){ return x > 0;}) == []` Question .  Fill in the missing function name. `(["Luke Skywalker", "Joh Yowza", "Countess Von Backwards"], 1) == ["Luke Skywalker","Countess Von Backwards"]` Question .  Fill in the missing function name. `([-10, -9, 6]) == -13` Question .  Fill in the missing function name. `([-19, -10, -11, -6], [-7, -6, -10, 4]) == [<-19,-7>,<-10,-6>,<-11,-10>,<-6,4>]` Question .  Fill in the missing function name. `([-11, 10, 1, -9]) == [-11,-9,1,10]` Question .  Given ```int incr(int x) { return x + 1; } ````([-15, -10, 4, 15, -11], incr) == [-14,-9,5,16,-10]` Question .  Complete this function that tests that a list of words forms a palindrome. A palindrome is a word that is symmetrical Fill in ```import List; public bool isPalindrome(list[str] words){ return words == ; } ``` and make the following true:`isPalindrome(["a", "b", "b", "a"]) == true;` | [New Subconcept] | [Recompile Course] | [Warnings] Is this page unclear, or have you spotted an error? Please add a comment below and help us to improve it. For all other questions and remarks, visit ask.rascal-mpl.org.