8632741247

Committed 10 Apr 2024 02:12PM UTC coverage: 87.32% (+0.5%) from 86.862%

Build # 8632741247

Build Type

Pull #29

github

Committed by

hbbio

Commit Message

json: use toString for classes

Pull Request Pull Request #29: Object utilities + follow

Run Details

395 of 466 branches covered (84.76%)

Branch coverage included in aggregate %.

164 of 170 new or added lines in 5 files covered. (96.47%)

29 existing lines in 2 files now uncovered.

3007 of 3430 relevant lines covered (87.67%)

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86.55

/src/array.ts

import { type AnyCell, MapCell, ValueCell } from "./cell";
import { collector, reuseOrCreate } from "./gc";
import type { SheetProxy } from "./proxy";

export type CellArray<T> = AnyCell<AnyCell<T>[]>;

/**
 * mapArray implements .map() for a cellified array.
 *
 * @param proxy
 * @param arr canonical form cell array
 * @param fn to map each element cell
 * @returns mapped array cell
 *
 * @description This function reuses existing mapped cells.
 * @todo Delete unused mapped cells
 */
export const mapArray = <T, U>(
  proxy: SheetProxy,
  arr: CellArray<T>,
  fn: (v: T, index?: number) => U | Promise<U>,
  name = "map"
): MapCell<MapCell<U, false>[], false> =>
  proxy.map(
    [arr],
    (cells, prev) => {
      const set = new Set((prev || []).map((cell) => cell.id));
      const res = cells.map((cell, index) => {
        // reuse previously mapped cell
        const reuse = prev?.find((_c) => _c.dependencies?.[0] === cell.id);
        if (reuse !== undefined) set.delete(reuse.id);
        return (
          reuse ||
          // create new map
          proxy.map([cell], (_cell) => fn(_cell, index), `[${index}]`)
        );
      });
      // collect unused previously mapped cells
      proxy._sheet.collect(...[...set]);
      return res;
    },
    name
  );

/**
 * implementation of sort for a cellified array.
 * @description this implementation relies on pointers but reuses the original cells.
 * @param proxy
 * @param arr
 * @param compare comparison function
 */
export const sort = <T>(
  proxy: SheetProxy,
  arr: CellArray<T>,
  compare: (a: T, b: T) => number = (a, b) => (a > b ? 1 : a < b ? -1 : 0)
): CellArray<T> => {
  const coll = collector<CellArray<T>>(proxy);
  return proxy.map(
    [arr],
    (cells) =>
      coll(
        proxy.mapNoPrevious(
          cells,
          (..._cells) =>
            _cells
              .map((_, index) => index)
              .sort((indexA, indexB) => compare(_cells[indexA], _cells[indexB]))
              .map((index) => cells[index]),
          "_sort"
        )
      ),
    "sort"
  );
};

/**
 * mapArrayCell is a variant of `mapArray` with a function taking
 * element cells as arguments.
 * @param proxy
 * @param arr
 * @param fn
 * @returns mapped array cell
 */
export const mapArrayCell = <T, U, NF extends boolean = false>(
  proxy: SheetProxy,
  arr: CellArray<T>,
  fn: AnyCell<(v: AnyCell<T>, idx?: number) => AnyCell<U>>,
  name = "map",
  nf?: NF
): MapCell<MapCell<U, NF>[], NF> => {
  let prevFn: (v: AnyCell<T>) => AnyCell<U>;
  return proxy.map(
    [arr, fn],
    (cells, _fn, prev) => {
      const arr = cells.map((cell, i) =>
        // @todo collect previously mapped cells
        reuseOrCreate(
          _fn === prevFn, // function unchanged
          () => prev?.find((_c) => _c.dependencies?.[0] === cell.id), // reuse
          () => _fn(cell, i) as MapCell<U, NF> // create new map
        )
      );
      prevFn = _fn;
      return arr;
    },
    name,
    nf
  );
};

/**
 * first element of recursive arrays.
 */
export const first = <T>(
  proxy: SheetProxy,
  arr: AnyCell<T | AnyCell<T>[]>,
  name = "last"
): MapCell<T, boolean> => {
  // @todo collectors (on path?)
  const aux = (arr: AnyCell<T | AnyCell<T>[]>) =>
    proxy.mapNoPrevious(
      [arr],
      (_arr) => {
        if (!Array.isArray(_arr)) return arr as AnyCell<T>;
        if (_arr.length === 0) return null; // @todo pointer to nullCell?
        return aux(_arr[0]);
      },
      name
    );
  return aux(arr);
};

/**
 * last element of recursive arrays.
 */
export const last = <T>(
  proxy: SheetProxy,
  arr: AnyCell<T | AnyCell<T>[]>,
  name = "last"
): MapCell<T, boolean> => {
  // @todo collectors (on path?)
  const aux = (arr: AnyCell<T | AnyCell<T>[]>) =>
    proxy.mapNoPrevious(
      [arr],
      (_arr) => {
        if (Array.isArray(_arr)) return aux(_arr[_arr.length - 1]);
        return arr as AnyCell<T>;
      },
      name
    );
  return aux(arr);
};

/**
 * reduce a cellified array.
 * @param proxy
 * @param arr
 * @param fn
 * @param init
 * @returns reduced cell
 */
export const reduce = <
  T,
  R extends unknown | Promise<unknown>,
  NF extends boolean = false
>(
  proxy: SheetProxy,
  arr: CellArray<T>,
  fn: (acc: R, elt: T, index?: number) => R,
  init: R,
  name = "reduce",
  nf?: NF
): MapCell<R, NF> => {
  const coll = collector<MapCell<R, NF>>(proxy);
  return proxy.map(
    [arr],
    (cells) =>
      coll(
        proxy.mapNoPrevious(
          cells,
          (..._cells) => _cells.reduce(fn, init),
          "_reduce"
        )
      ),
    name,
    nf
  );
};

export const find = <T, NF extends boolean = false>(
  proxy: SheetProxy,
  arr: CellArray<T>,
  predicate: (v: T) => boolean,
  name = "find",
  nf?: NF
) => {
  const coll = collector<MapCell<T, NF>>(proxy);
  return proxy.map(
    [arr],
    (cells) =>
      coll(proxy.mapNoPrevious(cells, (..._cells) => _cells.find(predicate))),
    name,
    nf
  );
};

// @todo generalize
export const findCell = <T, NF extends boolean = false>(
  proxy: SheetProxy,
  arr: CellArray<T>,
  predicate: AnyCell<(v: AnyCell<T>) => AnyCell<boolean>>,
  name = "find",
  nf?: NF
) => {
  const coll = collector<MapCell<T, NF>>(proxy);
  // Since predicate is a reactive function, we have to instantiate
  // the computation for each cell.
  // const keep = mapArrayCell(proxy, arr, predicate, "keep", nf);
  let prevFn: (elt: AnyCell<T>) => AnyCell<boolean>;
  const keep = proxy.map(
    [predicate, arr],
    (fn, cells, _prev: AnyCell<boolean>[]) => {
      // console.log({ keep: cells.length });
      // @todo if the predicate function has changed, collect previous mapped cells
      const keep = cells.map((cell) => {
        // We can reuse a cell only if the predicate hasn't changed.
        // @todo collect previously mapped cells for deleted cells in arr
        const reuse =
          prevFn === fn &&
          _prev?.find((_c) => _c.dependencies?.[0] === cell.id);
        return reuse || fn(cell);
      });
      prevFn = fn;
      return keep;
    },
    "keep",
    nf
  );
  return proxy.map(
    [arr, keep],
    (cells, _keep) =>
      coll(
        proxy.mapNoPrevious(_keep, (..._flat) => cells.find((_, i) => _flat[i]))
      ),
    name,
    nf
  );
};

export const findIndex = <T, NF extends boolean = false>(
  proxy: SheetProxy,
  arr: CellArray<T>,
  fn: (v: T) => boolean,
  name = "find",
  nf?: NF
) => {
  const coll = collector<MapCell<number, NF>>(proxy);
  return proxy.map(
    [arr],
    (cells) =>
      coll(proxy.mapNoPrevious(cells, (..._cells) => _cells.findIndex(fn))),
    name,
    nf
  );
};

/**
 * filter updates a cellified array in a `ValueCell` using a predicate function as filter.
 * @param arr
 * @param predicate function that returns `true` for kept values.
 * @returns nothing
 * @description filtered out cells are _not_ deleted
 */
export const filter = <T, NF extends boolean = false>(
  proxy: SheetProxy,
  predicate: AnyCell<(elt: T) => boolean>,
  arr: CellArray<T>,
  name = "filter",
  nf?: NF
) => {
  const coll = collector<MapCell<AnyCell<T>[], NF>>(proxy);
  return proxy.map(
    [predicate, arr],
    (fn, cells) =>
      coll(
        proxy.mapNoPrevious(
          cells,
          (..._cells) => cells.filter((_, i) => fn(_cells[i])),
          "_filter"
        )
      ),
    name,
    nf
  );
};

export const mapFlat = <T, NF extends boolean = false>(
  proxy: SheetProxy,
  arr: CellArray<T>,
  name = "flatten",
  nf?: NF
) => {
  const coll = collector<MapCell<T[], NF>>(proxy);
  return proxy.map(
    [arr],
    (cells) => coll(proxy.mapNoPrevious(cells, (..._cells) => _cells)),
    name,
    nf
  );
};

/**
 * filterPredicateCell updates a cellified array in a `ValueCell` using a predicate function as filter.
 * @param arr
 * @param predicate as Cell function that returns `true` for kept values.
 * @returns nothing
 * @description filtered out cells are _not_ deleted
 */
export const filterPredicateCell = <T, NF extends boolean = false>(
  proxy: SheetProxy,
  predicate: AnyCell<(elt: AnyCell<T>) => AnyCell<boolean>>,
  arr: CellArray<T>,
  name = "filter",
  nf?: NF
) => {
  const coll = collector<MapCell<AnyCell<T>[], NF>>(proxy);
  // Since predicate is a reactive function, we have to instantiate
  // the computation for each cell.
  // const keep = mapArrayCell(proxy, arr, predicate, "keep", nf);
  let prevFn: (elt: AnyCell<T>) => AnyCell<boolean>;
  const keep = proxy.map(
    [predicate, arr],
    (fn, cells, _prev: AnyCell<boolean>[]) => {
      // console.log({ keep: cells.length });
      // @todo if the predicate function has changed, collect previous mapped cells
      const keep = cells.map((cell) => {
        // We can reuse a cell only if the predicate hasn't changed.
        // @todo collect previously mapped cells for deleted cells in arr
        const reuse =
          prevFn === fn &&
          _prev?.find((_c) => _c.dependencies?.[0] === cell.id);
        return reuse || fn(cell);
      });
      prevFn = fn;
      return keep;
    },
    "keep",
    nf
  );
  return proxy.map(
    [arr, keep],
    (cells, _keep) =>
      coll(
        proxy.mapNoPrevious(
          _keep,
          (..._flat) => cells.filter((_, i) => _flat[i]),
          "filter.map"
        )
      ),
    name,
    nf
  );
};

1	import { type AnyCell, MapCell, ValueCell } from "./cell";	1✔
2	import { collector, reuseOrCreate } from "./gc";	1✔
3	import type { SheetProxy } from "./proxy";	1✔
4		1✔
5	export type CellArray<T> = AnyCell<AnyCell<T>[]>;	1✔
6		1✔
7	/**	1✔
8	* mapArray implements .map() for a cellified array.	1✔
9	*	1✔
10	* @param proxy	1✔
11	* @param arr canonical form cell array	1✔
12	* @param fn to map each element cell	1✔
13	* @returns mapped array cell	1✔
14	*	1✔
15	* @description This function reuses existing mapped cells.	1✔
16	* @todo Delete unused mapped cells	1✔
17	*/	1✔
18	export const mapArray = <T, U>(	1✔
19	proxy: SheetProxy,	2✔
20	arr: CellArray<T>,	2✔
21	fn: (v: T, index?: number) => U \| Promise<U>,	2✔
22	name = "map"	2✔
23	): MapCell<MapCell<U, false>[], false> =>	2✔
24	proxy.map(	2✔
25	[arr],	2✔
26	(cells, prev) => {	2✔
27	const set = new Set((prev \|\| []).map((cell) => cell.id));	6✔
28	const res = cells.map((cell, index) => {	6✔
29	// reuse previously mapped cell	20✔
30	const reuse = prev?.find((_c) => _c.dependencies?.[0] === cell.id);	20✔
31	if (reuse !== undefined) set.delete(reuse.id);	20✔
32	return (	20✔
33	reuse \|\|	20✔
34	// create new map	8✔
35	proxy.map([cell], (_cell) => fn(_cell, index), `[${index}]`)	8✔
36	);	20✔
37	});	6✔
38	// collect unused previously mapped cells	6✔
39	proxy._sheet.collect(...[...set]);	6✔
40	return res;	6✔
41	},	6✔
42	name	2✔
43	);	2✔
44		1✔
45	/**	1✔
46	* implementation of sort for a cellified array.	1✔
47	* @description this implementation relies on pointers but reuses the original cells.	1✔
48	* @param proxy	1✔
49	* @param arr	1✔
50	* @param compare comparison function	1✔
51	*/	1✔
52	export const sort = <T>(	1✔
53	proxy: SheetProxy,	3✔
54	arr: CellArray<T>,	3✔
55	compare: (a: T, b: T) => number = (a, b) => (a > b ? 1 : a < b ? -1 : 0)	3✔
56	): CellArray<T> => {	3✔
57	const coll = collector<CellArray<T>>(proxy);	3✔
58	return proxy.map(	3✔
59	[arr],	3✔
60	(cells) =>	3✔
61	coll(	6✔
62	proxy.mapNoPrevious(	6✔
63	cells,	6✔
64	(..._cells) =>	6✔
65	_cells	8✔
66	.map((_, index) => index)	8✔
67	.sort((indexA, indexB) => compare(_cells[indexA], _cells[indexB]))	8✔
68	.map((index) => cells[index]),	8✔
69	"_sort"	6✔
70	)	6✔
71	),	6✔
72	"sort"	3✔
73	);	3✔
74	};	3✔
75		1✔
76	/**	1✔
77	* mapArrayCell is a variant of `mapArray` with a function taking	1✔
78	* element cells as arguments.	1✔
79	* @param proxy	1✔
80	* @param arr	1✔
81	* @param fn	1✔
82	* @returns mapped array cell	1✔
83	*/	1✔
84	export const mapArrayCell = <T, U, NF extends boolean = false>(	1✔
85	proxy: SheetProxy,	1✔
86	arr: CellArray<T>,	1✔
87	fn: AnyCell<(v: AnyCell<T>, idx?: number) => AnyCell<U>>,	1✔
88	name = "map",	1✔
89	nf?: NF	1✔
90	): MapCell<MapCell<U, NF>[], NF> => {	1✔
91	let prevFn: (v: AnyCell<T>) => AnyCell<U>;	1✔
92	return proxy.map(	1✔
93	[arr, fn],	1✔
94	(cells, _fn, prev) => {	1✔
95	const arr = cells.map((cell, i) =>	2✔
96	// @todo collect previously mapped cells	6✔
97	reuseOrCreate(	6✔
98	_fn === prevFn, // function unchanged	6✔
99	() => prev?.find((_c) => _c.dependencies?.[0] === cell.id), // reuse	6✔
100	() => _fn(cell, i) as MapCell<U, NF> // create new map	6✔
101	)	6✔
102	);	2✔
103	prevFn = _fn;	2✔
104	return arr;	2✔
105	},	2✔
106	name,	1✔
107	nf	1✔
108	);	1✔
109	};	1✔
110		1✔
111	/**	1✔
112	* first element of recursive arrays.	1✔
113	*/	1✔
114	export const first = <T>(	1✔
115	proxy: SheetProxy,	1✔
116	arr: AnyCell<T \| AnyCell<T>[]>,	1✔
117	name = "last"	1✔
118	): MapCell<T, boolean> => {	1✔
119	// @todo collectors (on path?)	1✔
120	const aux = (arr: AnyCell<T \| AnyCell<T>[]>) =>	1✔
121	proxy.mapNoPrevious(	2✔
122	[arr],	2✔
123	(_arr) => {	2✔
124	if (!Array.isArray(_arr)) return arr as AnyCell<T>;	2✔
125	if (_arr.length === 0) return null; // @todo pointer to nullCell?	2✔
126	return aux(_arr[0]);	1✔
127	},	2✔
128	name	2✔
129	);	2✔
130	return aux(arr);	1✔
131	};	1✔
132		1✔
133	/**	1✔
134	* last element of recursive arrays.	1✔
135	*/	1✔
136	export const last = <T>(	1✔
137	proxy: SheetProxy,	1✔
138	arr: AnyCell<T \| AnyCell<T>[]>,	1✔
139	name = "last"	1✔
140	): MapCell<T, boolean> => {	1✔
141	// @todo collectors (on path?)	1✔
142	const aux = (arr: AnyCell<T \| AnyCell<T>[]>) =>	1✔
143	proxy.mapNoPrevious(	2✔
144	[arr],	2✔
145	(_arr) => {	2✔
146	if (Array.isArray(_arr)) return aux(_arr[_arr.length - 1]);	2✔
147	return arr as AnyCell<T>;	1✔
148	},	2✔
149	name	2✔
150	);	2✔
151	return aux(arr);	1✔
152	};	1✔
153		1✔
154	/**	1✔
155	* reduce a cellified array.	1✔
156	* @param proxy	1✔
157	* @param arr	1✔
158	* @param fn	1✔
159	* @param init	1✔
160	* @returns reduced cell	1✔
161	*/	1✔
162	export const reduce = <	1✔
163	T,	2✔
164	R extends unknown \| Promise<unknown>,	2✔
165	NF extends boolean = false	2✔
166	>(	2✔
167	proxy: SheetProxy,	2✔
168	arr: CellArray<T>,	2✔
169	fn: (acc: R, elt: T, index?: number) => R,	2✔
170	init: R,	2✔
171	name = "reduce",	2✔
172	nf?: NF	2✔
173	): MapCell<R, NF> => {	2✔
174	const coll = collector<MapCell<R, NF>>(proxy);	2✔
175	return proxy.map(	2✔
176	[arr],	2✔
177	(cells) =>	2✔
178	coll(	5✔
179	proxy.mapNoPrevious(	5✔
180	cells,	5✔
181	(..._cells) => _cells.reduce(fn, init),	5✔
182	"_reduce"	5✔
183	)	5✔
184	),	5✔
185	name,	2✔
186	nf	2✔
187	);	2✔
188	};	2✔
189		1✔
190	export const find = <T, NF extends boolean = false>(	1✔
191	proxy: SheetProxy,	1✔
192	arr: CellArray<T>,	1✔
193	predicate: (v: T) => boolean,	1✔
194	name = "find",	1✔
195	nf?: NF	1✔
196	) => {	1✔
197	const coll = collector<MapCell<T, NF>>(proxy);	1✔
198	return proxy.map(	1✔
199	[arr],	1✔
200	(cells) =>	1✔
201	coll(proxy.mapNoPrevious(cells, (..._cells) => _cells.find(predicate))),	1✔
202	name,	1✔
203	nf	1✔
204	);	1✔
205	};	1✔
206		1✔
207	// @todo generalize	1✔
208	export const findCell = <T, NF extends boolean = false>(	1✔
UNCOV 209	proxy: SheetProxy,	×
UNCOV 210	arr: CellArray<T>,	×
UNCOV 211	predicate: AnyCell<(v: AnyCell<T>) => AnyCell<boolean>>,	×
UNCOV 212	name = "find",	×
UNCOV 213	nf?: NF	×
UNCOV 214	) => {	×
UNCOV 215	const coll = collector<MapCell<T, NF>>(proxy);	×
UNCOV 216	// Since predicate is a reactive function, we have to instantiate	×
UNCOV 217	// the computation for each cell.	×
UNCOV 218	// const keep = mapArrayCell(proxy, arr, predicate, "keep", nf);	×
UNCOV 219	let prevFn: (elt: AnyCell<T>) => AnyCell<boolean>;	×
UNCOV 220	const keep = proxy.map(	×
UNCOV 221	[predicate, arr],	×
222	(fn, cells, _prev: AnyCell<boolean>[]) => {	×
223	// console.log({ keep: cells.length });	×
224	// @todo if the predicate function has changed, collect previous mapped cells	×
225	const keep = cells.map((cell) => {	×
226	// We can reuse a cell only if the predicate hasn't changed.	×
227	// @todo collect previously mapped cells for deleted cells in arr	×
228	const reuse =	×
229	prevFn === fn &&	×
230	_prev?.find((_c) => _c.dependencies?.[0] === cell.id);	×
231	return reuse \|\| fn(cell);	×
232	});	×
233	prevFn = fn;	×
234	return keep;	×
235	},	×
236	"keep",	×
237	nf	×
238	);	×
239	return proxy.map(	×
240	[arr, keep],	×
241	(cells, _keep) =>	×
242	coll(	×
243	proxy.mapNoPrevious(_keep, (..._flat) => cells.find((_, i) => _flat[i]))	×
244	),	×
245	name,	×
246	nf	×
247	);	×
248	};	×
249		1✔
250	export const findIndex = <T, NF extends boolean = false>(	1✔
251	proxy: SheetProxy,	1✔
252	arr: CellArray<T>,	1✔
253	fn: (v: T) => boolean,	1✔
254	name = "find",	1✔
255	nf?: NF	1✔
256	) => {	1✔
257	const coll = collector<MapCell<number, NF>>(proxy);	1✔
258	return proxy.map(	1✔
259	[arr],	1✔
260	(cells) =>	1✔
261	coll(proxy.mapNoPrevious(cells, (..._cells) => _cells.findIndex(fn))),	2✔
262	name,	1✔
263	nf	1✔
264	);	1✔
265	};	1✔
266		1✔
267	/**	1✔
268	* filter updates a cellified array in a `ValueCell` using a predicate function as filter.	1✔
269	* @param arr	1✔
270	* @param predicate function that returns `true` for kept values.	1✔
271	* @returns nothing	1✔
272	* @description filtered out cells are _not_ deleted	1✔
273	*/	1✔
274	export const filter = <T, NF extends boolean = false>(	1✔
275	proxy: SheetProxy,	1✔
276	predicate: AnyCell<(elt: T) => boolean>,	1✔
277	arr: CellArray<T>,	1✔
278	name = "filter",	1✔
279	nf?: NF	1✔
280	) => {	1✔
281	const coll = collector<MapCell<AnyCell<T>[], NF>>(proxy);	1✔
282	return proxy.map(	1✔
283	[predicate, arr],	1✔
284	(fn, cells) =>	1✔
285	coll(	2✔
286	proxy.mapNoPrevious(	2✔
287	cells,	2✔
288	(..._cells) => cells.filter((_, i) => fn(_cells[i])),	2✔
289	"_filter"	2✔
290	)	2✔
291	),	2✔
292	name,	1✔
293	nf	1✔
294	);	1✔
295	};	1✔
296		1✔
297	export const mapFlat = <T, NF extends boolean = false>(	1✔
UNCOV 298	proxy: SheetProxy,	×
UNCOV 299	arr: CellArray<T>,	×
UNCOV 300	name = "flatten",	×
UNCOV 301	nf?: NF	×
UNCOV 302	) => {	×
UNCOV 303	const coll = collector<MapCell<T[], NF>>(proxy);	×
UNCOV 304	return proxy.map(	×
UNCOV 305	[arr],	×
UNCOV 306	(cells) => coll(proxy.mapNoPrevious(cells, (..._cells) => _cells)),	×
UNCOV 307	name,	×
UNCOV 308	nf	×
UNCOV 309	);	×
UNCOV 310	};	×
311		1✔
312	/**	1✔
313	* filterPredicateCell updates a cellified array in a `ValueCell` using a predicate function as filter.	1✔
314	* @param arr	1✔
315	* @param predicate as Cell function that returns `true` for kept values.	1✔
316	* @returns nothing	1✔
317	* @description filtered out cells are _not_ deleted	1✔
318	*/	1✔
319	export const filterPredicateCell = <T, NF extends boolean = false>(	1✔
320	proxy: SheetProxy,	1✔
321	predicate: AnyCell<(elt: AnyCell<T>) => AnyCell<boolean>>,	1✔
322	arr: CellArray<T>,	1✔
323	name = "filter",	1✔
324	nf?: NF	1✔
325	) => {	1✔
326	const coll = collector<MapCell<AnyCell<T>[], NF>>(proxy);	1✔
327	// Since predicate is a reactive function, we have to instantiate	1✔
328	// the computation for each cell.	1✔
329	// const keep = mapArrayCell(proxy, arr, predicate, "keep", nf);	1✔
330	let prevFn: (elt: AnyCell<T>) => AnyCell<boolean>;	1✔
331	const keep = proxy.map(	1✔
332	[predicate, arr],	1✔
333	(fn, cells, _prev: AnyCell<boolean>[]) => {	1✔
334	// console.log({ keep: cells.length });	2✔
335	// @todo if the predicate function has changed, collect previous mapped cells	2✔
336	const keep = cells.map((cell) => {	2✔
337	// We can reuse a cell only if the predicate hasn't changed.	6✔
338	// @todo collect previously mapped cells for deleted cells in arr	6✔
339	const reuse =	6✔
340	prevFn === fn &&	6!
UNCOV 341	_prev?.find((_c) => _c.dependencies?.[0] === cell.id);	×
342	return reuse \|\| fn(cell);	6✔
343	});	2✔
344	prevFn = fn;	2✔
345	return keep;	2✔
346	},	2✔
347	"keep",	1✔
348	nf	1✔
349	);	1✔
350	return proxy.map(	1✔
351	[arr, keep],	1✔
352	(cells, _keep) =>	1✔
353	coll(	2✔
354	proxy.mapNoPrevious(	2✔
355	_keep,	2✔
356	(..._flat) => cells.filter((_, i) => _flat[i]),	2✔
357	"filter.map"	2✔
358	)	2✔
359	),	2✔
360	name,	1✔
361	nf	1✔
362	);	1✔
363	};	1✔

okcontract / cells / 8632741247

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