Function groupBy

Accumulates each chunk into an object where the key is the result of calling a provided function or using a chunk's property.

The key can be the result of a property on the chunk.

See

label:function

Example

--one------------two------------------three-----------------------------

groupBy('length')

--{'3':['one']}--{'3',['one','two']}--{'3':['one','two'],'5':['three']}-
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The key can be the result of calling a provided function.

Example

--6.1----------4.2--------------------6.3------------------------

groupBy(Math.floor)

--{'6':[6.1]}--{'4':[4.2],'6':[6.1]}--{'4':[4.2],'6':[6.1,6.3]}--
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