F# List.map equivalent in C#?

c# .net linq f#
Andrew Jones picture Andrew Jones · Oct 20, 2009 · Viewed 52.1k times · Source

Is there an equivalent to F#'s List.map function in C#? i.e. apply a function to each element in the list and return a new list containing the results.

Something like:

    public static IEnumerable<TResult> Map<TSource, TResult>(this IEnumerable<TSource> source, Func<TSource, TResult> funky)
    {
        foreach (TSource element in source)
            yield return funky.Invoke(element);
    }

Is there already a built in way or should I just write the custom extension?

Answer

Marc Gravell picture Marc Gravell · Oct 20, 2009

That is LINQ's Select - i.e.

var newSequence = originalSequence.Select(x => {translation});

or

var newSequence = from x in originalSequence
                  select {translation};

Related questions

LINQ query on a DataTable

I'm trying to perform a LINQ query on a DataTable object and bizarrely I am finding that performing such queries on DataTables is not straightforward. For example: var results = from myRow in myDataTable where results.Field("RowNo") == 1 select results; This …

Read More
Using LINQ to remove elements from a List<T>

Say that I have LINQ query such as: var authors = from x in authorsList where x.firstname == "Bob" select x; Given that authorsList is of type List<Author>, how can I delete the Author elements from authorsList that …

Read More
Group By Multiple Columns

How can I do GroupBy Multiple Columns in LINQ Something similar to this in SQL: SELECT * FROM <TableName> GROUP BY <Column1>,<Column2> How can I convert this to LINQ: QuantityBreakdown ( MaterialID int, ProductID int, …

Read More