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This behavior seems to be broken (I am using Scala 2.9.1)
var b= new StringBuilder
These are OK:
b+='a'
b.append('b')
b.append("de")
This produces compile error:
b+="de"
Any idea as to why only StringBuilder#+=(c: Char) exists whereas both StringBuilder#append(c:Char) and StringBuilder#append(s:String) happily co-exist? What is wrong with declaring and implementing StringBuilder#+=(s: String)?
Is it oversight or some deeper problem in the Scala type system?
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StringBuilder objects are like String objects, except that they can be modified. Internally, these objects are treated like variable-length arrays that contain a sequence of characters.
Companion object StringBuilderA builder for mutable sequence of characters. This class provides an API mostly compatible with java. lang. StringBuilder , except where there are conflicts with the Scala collections API (such as the reverse method.)
In Scala, as in Java, a string is an immutable object, that is, an object that cannot be modified.
StringBuilder will only create a new string when toString() is called on it. Until then, it keeps an char[] array of all the elements added to it. Any operation you perform, like insert or reverse is performed on that array.
Try b ++= "de". A String is considered a collection of Chars.
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