DeleteAdjacentDuplicates

deletes all duplicates in runs of identical elements in list.

applies test to pairs of consecutive elements to determine whether they should be considered duplicates.

Details

DeleteAdjacentDuplicates[list] deletes all but the first occurrence of each element that appears in a run of identical elements in list.
DeleteAdjacentDuplicates also works on associations.
DeleteAdjacentDuplicates never reorders elements, but only removes them.
DeleteAdjacentDuplicates[list] is equivalent to DeleteAdjacentDuplicates[list,SameQ].

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Delete adjacent duplicated elements:

Delete adjacent elements that coincide under Equal:

Delete elements whose values duplicate those just before them in the association:

Delete elements unless they are larger than the preceding ones:

In DeleteAdjacentDuplicates[list], list may be any nonatomic expression:

DeleteAdjacentDuplicates is similar to taking the first of each item from Split:

Delete sublists that have the same total:

The equivalent operation can be achieved using SplitBy as well:

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