::operator is more or less equivalent to cons in Lisp, ML, and similar languages. When you're pattern matching, it extracts. When you're declaring or assigning variables (particularly Lists), it concatenates.
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Learning Scala. The hard way.
::operator is more or less equivalent to cons in Lisp, ML, and similar languages. When you're pattern matching, it extracts. When you're declaring or assigning variables (particularly Lists), it concatenates.
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