Haskell equivalent of SML-like "return a function"

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SUMMARY

The discussion focuses on implementing a function in Haskell that mimics the behavior of an SML-like function, specifically returning a function that increments a value. The Haskell equivalent provided is defined as foo x = \x -> x + 1, which can be simplified to foo = const (+1). Additionally, the user seeks to create a function that removes consecutive duplicate characters from a string, exemplified by transforming "abaacccdee" into "abacde".

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I want do the Haskell equivalent of SML-like "return a function"

fun foo x = fn x=>x+1

How do I do this in Haskell?
 
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Code: 
foo :: a -> Int -> Int
foo x = \x -> x+1

This can be written more concisely as:

Code: 
foo = const (+1)
 
Hi,People! I need to define in haskell a function which ignore all doublings . For example if i type a string "abaacccdee" in the end i get the string "abacde".
 

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