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lines changed Original file line number Diff line number Diff line change @@ -16,7 +16,7 @@ Scala collections systematically distinguish between mutable and
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immutable collections. A _ mutable_ collection can be updated, reduced or
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extended in place. This means you can change, add, or remove elements
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of a collection as a side effect. _ Immutable_ collections, by
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- contrast, never change. You have still operations that simulate
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+ contrast, never change. You still have operations that simulate
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additions, removals, or updates, but those operations will in each
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case return a new collection and leave the old collection unchanged.
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@@ -36,7 +36,7 @@ always yield a collection with the same elements.
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A collection in package ` scala.collection.mutable ` is known to have
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some operations that change the collection in place. So dealing with
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- mutable collection means you need to understand which code changes
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+ a mutable collection means you need to understand which code changes
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which collection when.
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A collection in package ` scala.collection ` can be either mutable or
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