Atara

Map[f,{{a,b},{c,d,e}},{2}]

Map[f,{{a,b},{c,d,e}},2]

Gila

Nest[Join[#,Length[#]+Reverse[#]]&,{0},4]

Cheryl

mylist=Range[4,17,3]
Map[#^2&,mylist]

Why not simply:

mylist^2

Christina

What is the purpose of undefined functions?
What are the pros and cons of undefined functions vs defined functions

Gabriela

What is happening here:

NestWhile[Floor[#/2]&,10,UnsameQ,2]

NestWhileList[Floor[#/2]&,10,UnsameQ,2]

Do vs. While

NestList[Floor[#/2]&,2000,10]

NestList[Floor[#/2]&,10,10]

Hajar

Fold[f,x,{a,b,c,d}]

FoldList[f,x,{a,b,c,d}]

Example

Fold[Append,{x},{a,b,c,d}]