CODEWITHSUNDEEP
scalalistfunctional-programming
CodingNow
CodingNow

Reputation: 1028

Scala: How to make multiple methods and apply them one by one?

Scala: How to make multiple methods and apply them one by one?

I have a list: List("1", "2", "3")

and a method:

def concat(str: String)(tail: String): String = str + tail

My aim is to make three (imaginary) methods:

concat(str: String)("1")
concat(str: String)("2")
concat(str: String)("3")

and then apply these three methods one by one to a test string "abc": then I'll have the result: "abc123"

What is the functional way to do this? Any hints are appreciated.

Upvotes: 1

Views: 112

Answers (1)

Leo C
Leo C

Reputation: 22439

You don't need 3 different methods. Just use fold to traverse your list and apply your concat method successively:

val list = List("1", "2", "3")

def concat(str: String)(tail: String): String = str + tail

list.fold( "abc" )( concat(_)(_) )
// res1: String = abc123

Note that fold( "abc" )( concat(_)(_) ) is just a shortcut for:

fold( "abc" )( (acc, x) => concat(acc)(x) )

In case you aren't familiar with fold, here's the API doc

Upvotes: 4

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