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Editorial Team
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Editorial Team
Asked: May 13, 20262026-05-13T16:53:12+00:00 2026-05-13T16:53:12+00:00

How do you add an element to a List in Scala 2.7.5, without creating

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How do you add an element to a List in Scala 2.7.5, without creating a new List and without using a deprecated solution.

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  1. Editorial Team
    Editorial Team
    2026-05-13T16:53:13+00:00Added an answer on May 13, 2026 at 4:53 pm

    Non deprecated way of appending an
    element to a List in Scala 2.7.5?

    That does not exist, and it will never exist.

    How do you add an element to a List in
    Scala 2.7.5, without creating a new
    List and without using a deprecated
    solution.

    Use :::

    val newList = element :: oldList
    

    Or, if list is a var,

    list ::= element
    

    It does not create a new List (though, it creates a new ::, also known as cons), and it adds an element to it.

    If you want to append elements to a sequence without creating a new sequence, use a mutable data structure.

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