How to scramble a string of text?

How to implement foo function which works like this:

foo @ "abcdef"

"fdbace"

Steps: "bacdef", "cabdef", "dbacef", "ecabdf", "fdbace"

Reverse the first two letter of the string "abcdef" which will give "bacdef". Then take this as the new string and reverse the first 3 letter. Similarly, proceed for all the characters of the string.

Answer

s = "abcdef";

FoldList[
 StringJoin[
   StringReverse[StringTake[#1, {1, #2}]],

   StringTake[#1, {#2 + 1, -1}]
   ] &,
 s,
 Range[2, StringLength[s]]
 ]

{"abcdef", "bacdef", "cabdef", "dbacef", "ecabdf", "fdbace"}

Comments

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