The result is useful in printed displays, as a way of making them more compact. The original list can be recovered by appying value to the elements of the result, and then using deepSplice, provided that x contains no entries that are sequences.
i1 : x = {1,2,3,a,b,c,a,b,c,4,4,4,"asdf"};
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i2 : y = runLengthEncode x
o2 = {1..3, 2:a..c, 3:4, asdf}
o2 : List
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i3 : peek y
o3 = {BinaryOperation{.., 1, 3}, BinaryOperation{:, 2, a..c},
------------------------------------------------------------------------
BinaryOperation{:, 3, 4}, Holder{asdf}}
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i4 : value \ y
o4 = {(1, 2, 3), ((a, b, c), (a, b, c)), (4, 4, 4), asdf}
o4 : List
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i5 : deepSplice \\ oo
o5 = {1, 2, 3, a, b, c, a, b, c, 4, 4, 4, asdf}
o5 : List
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i6 : x === oo o6 = true |