How to convert a list of (Char,Int) to a string with the given number of repeated chars?

Question

How can I convert [(char,Int)] to a String of the Int in the second component gives the number of repetitions of the character in the first component? For examp

Answer 1

This can be assembled from just a few functions in the Prelude. Since your input is a list of tuples, the return value becomes a list of strings.

repChars :: (Char, Int) -> String
repChars (c,n) = replicate n c

Prelude> map repChars [('a',9),('b',10)]
["aaaaaaaaa","bbbbbbbbbb"]

Or if you want to do it as a point-free one-liner:

repCharList = map (uncurry (flip replicate))

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