Ruby / Rails Groups only Adjacent Array Elements

Question

I have a sorted array full of objects which I'd like to group by an attribute, but only if they're adjacent in the array.

a is sorted by the start attribute.

a = [{name: "joe", start: "9am", end: "10am"}, {name: "joe", start: "10am", end: "11am"}, {name: "harry", start: "11am", end: "12pm"}, {name: "harry", start: "12pm", end: "1pm"}, {name: "harry", start: "1pm", end: "2pm"}, {name: "joe", start: "2pm", end: "3pm"}, {name: "joe", start: "3pm", end: "4pm"}]

I would like to group adjacent objects by the name attribute so the results looks like:

a = [[{name: "joe", start: "9am", end: "10am"},{name: "joe", start: "10am", end: "11am"}],
    [{name: "harry", start: "11am", end: "12pm"},{name: "harry", start: "12pm", end: "1pm"},{name: "harry", start: "1pm", end: "2pm"}],
    [{name: "joe", start: "2pm", end: "3pm"},{name: "joe", start: "3pm", end: "4pm"}]]

BroiSatse · Accepted Answer · 2015-03-28 23:01:36Z

1

This should do:

a.chunk {|hash| hash[:name]}.map(&:last)

answered Mar 28, 2015 at 23:01

BroiSatse

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