Implemented indexed
Merge pull request #30 from PatrickMcDonald/patch-1

Implemented indexed
Assign mapFold and mapFoldBack
Merge pull request #31 from PatrickMcDonald/patch-1

Assign mapFold and mapFoldBack
Assign scanBack
Assign truncate
Merge pull request #33 from PatrickMcDonald/patch-3

Assign truncate
Merge pull request #32 from PatrickMcDonald/patch-2

Assign scanBack
Assign unfold
Merge pull request #34 from PatrickMcDonald/patch-1

Assign unfold
Assign windowed
Merge pull request #35 from PatrickMcDonald/patch-1

Assign windowed