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Why parameterize Array?

2 replies on 1 page. Most recent reply: Dec 9, 2010 8:33 PM by Jim Balter

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maninder batth

Posts: 4
Nickname: anywhere
Registered: Mar, 2006

Why parameterize Array?

Posted: Apr 6, 2010 2:25 PM

Hi, i was reading the book programming in scala and came across the example, where the author parameterizes the Array to be of String type as following :-
val greetStrings = new Array[String](3)
I was wondering if the parameterization is necessary. Arrays by definition can only contain ONE type. hence, the type of an array could be inferred by element at 0 index.
greetStrings(0) = "string" Or greetStrings(0) = 1

maninder batth

Posts: 4
Nickname: anywhere
Registered: Mar, 2006

Re: Why parameterize Array?

Posted: Apr 6, 2010 2:29 PM

Clarification :- it doesnt have to be 0th index. That was used to serve an example. It could be any index for that matter. But when inserting new data into an Array that already contains data, the type could be inferred and an exception can be raised if multiple types need to be inserted.

Jim Balter

Posts: 13
Nickname: jibal
Registered: Dec, 2010

Re: Why parameterize Array?

Posted: Dec 9, 2010 8:33 PM

Scala is a *statically* typed language; the type of the array (and of the val it is assigned to) must be known at compile time.

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