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DeleteDuplicatesBy

Status: Stable

documented, exercised by the test suite and/or worked examples, with no known limitations recorded.

Description

DeleteDuplicatesBy[expr, f]

Keeps the first element for each distinct f[element], preserving order. Over an association, f is applied to the values and the surviving entries are kept (keys preserved).

Examples (2)

Every input below was run against the current Mathilda build and its output recorded.

Basic examples (2)

In[1]:= DeleteDuplicatesBy[{1, 12, 3, 14, 5}, EvenQ]
Out[1]= {1, 12}

In[2]:= DeleteDuplicatesBy[<|"a" -> 1, "b" -> 12, "c" -> 3|>, EvenQ]
Out[2]= <|"a" -> 1, "b" -> 12|>

Implementation notes

Attributes: Protected.

References