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Mutating map for Arrays?

3 replies on 1 page. Most recent reply: Jan 29, 2008 3:29 AM by Javier Diaz Soto

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Toby Donaldson

Posts: 8
Nickname: tjd
Registered: Jun, 2003

Mutating map for Arrays?

Posted: Dec 27, 2007 7:17 PM

Is there a more elegant way of adding one to every element of an array (without making a copy) than this:


val arr = new Array[Int](10)
for(i <- 0 until arr.length) arr(i) += 1

If I could make a copy, then arr.map(_ + 1) would work nicely. I can't find a "mutating" map function for Array, e.g. something that would work like this:


arr.mutating_map(_ + 1)

Javier Diaz Soto

Posts: 29
Nickname: javierbds
Registered: Sep, 2005

Re: Mutating map for Arrays?

Posted: Jan 29, 2008 3:21 AM

Well, I haven't found I way of not having a copy, but you do not need to keep it:

a.map(_ + 1).copyToArray(a)

Javier Diaz Soto

Posts: 29
Nickname: javierbds
Registered: Sep, 2005

Re: Mutating map for Arrays?

Posted: Jan 29, 2008 3:22 AM

oops,

a.map(_ + 1).copyToArray(a,0)

Javier Diaz Soto

Posts: 29
Nickname: javierbds
Registered: Sep, 2005

Re: Mutating map for Arrays?

Posted: Jan 29, 2008 3:29 AM

well, even this works (I am a newbie)

a = a.map(_ + 1)

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