Post by Graham Sutherland / Polynomial

281d

what's a good name for a function that works like GroupBy except the group key selector returns an array of keys and the element is placed into each of those groups?

GroupByMany? DistributeBy? maybe LabelBy?

EDIT: MultiLabelBy is currently my preferred answer.

EDIT2: CategoriseBy has also been suggested and seems perhaps more intuitive. thoughts?

Edited 281d ago

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281d

no idea if this is even legible after compression but here goes...

Screenshot of a CategoriseBy function written in PHP.

Categorises the elements of a sequence according to a specified label selector function, allowing each element to be duplicated into any number of categories, with the elements of each category optionally projected by a specified value selector function.

This function allows you to categorise elements based on a label selector function, and optionally also project the values in each category using a value selector function.

The label selector function can return any number of labels, and elements will be placed into all categories matching those labels.

The category label is passed to the value selector function so that different projections may be accomplished depending on the category label.

This is distinct from GroupBy because it allows elements to be duplicated across categories, or placed into no category, rather than each source element going into exactly one category.

ALT

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281d

and yes I know the phpdoc syntax highlighting is broken

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