Method of updating map

If an iteratee function is provided, it will be used on each value to generate the criterion by which the value is ranked. If an iteratee function is provided, it will be used on each value to generate the criterion by which the value is ranked.

-Infinity is returned if list is empty, so an is Empty guard may be required. Infinity is returned if list is empty, so an is Empty guard may be required. Splits a collection into sets, grouped by the result of running each value through iteratee.

In particular only the first occurence of each value is kept.

You may also read through the annotated source code. Each invocation of iteratee is called with three arguments: Also known as inject and foldl, reduce boils down a list of values into a single value.

If iteratee is a string instead of a function, groups by the property named by iteratee on each of the values.

Given a list, and an iteratee function that returns a key for each element in the list (or a property name), returns an object with an index of each item.

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