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Josh Berdine 920c553902 [sledge] Change type of fold functions for improved composition ... Summary: Change the type of `fold` functions to enable them to compose better. The guiding reasoning behind using types such as: ``` val fold : 'a t -> 's -> f:('a -> 's -> 's) -> 's ``` is: 1. The function argument should be labeled. This is so that it can be reordered relative to the others, since it is often a multi-line `fun` expression. 2. The function argument should come last. This enables its arguments (which are often polymorphic) to benefit from type-based disambiguation information determined by the types of the other arguments at the call sites. 3. The function argument's type should produce an accumulator-transformer when partially-applied. That is, `f x : 's -> 's`. This composes well with other functions designed to produce transformers/endofunctions when partially applied, and in particular improves the common case of composing folds into "state-passing style" code. 4. The fold function itself should produce an accumulator-transformer when partially applied. So `'a t -> 's -> f:_ -> 's` rather than `'s -> 'a t -> f:_ -> 's` or `'a t -> init:'s -> f:_ -> 's` etc. Reviewed By: jvillard Differential Revision: D24306063 fbshipit-source-id: 13bd8bbee		4 years ago
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NS.ml	[sledge] Switch from Base.Option to Containers.Option	4 years ago
NS.mli	[sledge] Change type of fold functions for improved composition	4 years ago
NS0.ml	[sledge] Change type of fold functions for improved composition	4 years ago
array.ml	[sledge] Change type of fold functions for improved composition	4 years ago
array.mli	[sledge] Change type of fold functions for improved composition	4 years ago
dune	[sledge] Switch from Base.Hash_set to CCHashSet	4 years ago
float.ml	[sledge] Refactor nonstdlib to avoid opening Core	4 years ago
float.mli	[sledge] Refactor nonstdlib to avoid opening Core	4 years ago
hashSet.ml	[sledge] Switch from Base.Hash_set to CCHashSet	4 years ago
hashSet.mli	[sledge] Switch from Base.Hash_set to CCHashSet	4 years ago
hashTable.ml	[sledge] Change type of fold functions for improved composition	4 years ago
hashTable.mli	[sledge] Switch from Base.Hashtbl to Containers.Hashtbl	4 years ago
hashTable_intf.ml	[sledge] Change type of fold functions for improved composition	4 years ago
iArray.ml	[sledge] Switch IArray from Core_kernel.Array to NS.Array	4 years ago
iArray.mli	[sledge] Change type of fold functions for improved composition	4 years ago
int.ml	[sledge] Switch from Base.Int to Stdlib and Containers	4 years ago
int.mli	[sledge] Switch from Base.Int to Stdlib and Containers	4 years ago
iter.ml	[sledge] Change type of fold functions for improved composition	4 years ago
iter.mli	[sledge] Change type of fold functions for improved composition	4 years ago
list.ml	[sledge] Change type of fold functions for improved composition	4 years ago
list.mli	[sledge] Change type of fold functions for improved composition	4 years ago
map.ml	[sledge] Change type of fold functions for improved composition	4 years ago
map.mli	[sledge] Build: Promote `import` subdirectory to a toplevel `nonstdlib` library	5 years ago
map_intf.ml	[sledge] Change type of fold functions for improved composition	4 years ago
monad.ml	[sledge] Refactor: Add monad to manage generation of fresh vars in Exec	5 years ago
monad.mli	[sledge] Refactor: Add monad to manage generation of fresh vars in Exec	5 years ago
multiset.ml	[sledge] Change type of fold functions for improved composition	4 years ago
multiset.mli	[sledge] Generalize Multiset over type of multiplicities	4 years ago
multiset_intf.ml	[sledge] Change type of fold functions for improved composition	4 years ago
option.ml	[sledge] Change type of fold functions for improved composition	4 years ago
option.mli	[sledge] Change type of fold functions for improved composition	4 years ago
q_ext.ml	[sledge] Switch from Base.Hashtbl to Containers.Hashtbl	4 years ago
q_ext.mli	[sledge] Refactor nonstdlib to avoid opening Core	4 years ago
set.ml	[sledge] Change type of fold functions for improved composition	4 years ago
set.mli	[sledge] Build: Promote `import` subdirectory to a toplevel `nonstdlib` library	5 years ago
set_intf.ml	[sledge] Change type of fold functions for improved composition	4 years ago
sign.ml	[sledge] Refactor nonstdlib to avoid opening Core	4 years ago
sign.mli	[sledge] Refactor nonstdlib to avoid opening Core	4 years ago
string.ml	[sledge] Switch from Base.String to Containers.String	4 years ago
string.mli	[sledge] Switch from Base.String to Containers.String	4 years ago
sys.ml	[sledge] Refactor nonstdlib to avoid opening Core	4 years ago
sys.mli	[sledge] Refactor nonstdlib to avoid opening Core	4 years ago
timer.ml	[sledge] Refactor nonstdlib to avoid opening Core	4 years ago
timer.mli	[sledge] Build: Move Timer to Nonstdlib	5 years ago
z_ext.ml	[sledge] Refactor nonstdlib to avoid opening Core	4 years ago
z_ext.mli	[sledge] Refactor nonstdlib to avoid opening Core	4 years ago