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set.ts
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set.ts
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import { Either, Left, Right } from 'monet';
export const setAddIterable = <T>(
it: IterableIterator<T> | Iterable<T>,
set: Set<T>
) => {
for (const i of it) {
set.add(i);
}
return set;
};
export const setFind = <T>(
foo: ((s: T) => boolean),
set: Set<T> | ReadonlySet<T>
) => {
for (const z of set) {
if (foo(z)) {
return z;
}
}
return;
};
export const setEqual = <T>(setA: Set<T>, setB: Set<T>) => {
if (setA.size !== setB.size) {
return false;
}
for (const a of setA) {
if (!setB.has(a)) {
return false;
}
}
return true;
};
export const setSome = <T>(
foo: ((s: T) => boolean),
set: Set<T> | ReadonlySet<T>
) => {
for (const z of set) {
if (foo(z)) {
return true;
}
}
return false;
};
export const setFilter = <T>(
foo: ((s: T) => boolean),
a: Set<T> | ReadonlySet<T>
) => new Set([...a].filter(foo));
export const setIntersect = <T>(
a: Set<T> | ReadonlySet<T> | ReadonlySet<T>,
b: Set<T> | ReadonlySet<T>
) => setFilter(x => b.has(x), a);
export const setDifference = <T>(
a: Set<T> | ReadonlySet<T>,
b: Set<T> | ReadonlySet<T>
) => new Set([...a].filter(x => !b.has(x)));
export const setCreate = <T>(a: Iterable<T> = []) => new Set<T>(a);
export const setBlankCreate = <T>() => new Set<T>();
export const setClone = <T>(s: ReadonlySet<T>) => new Set<T>([...s]);
export const setBulkDelete = <T>(
a: Iterable<T> | IterableIterator<T>,
set: Set<T>
) => {
for (const i of a) {
set.delete(i);
}
return set;
};
export const readonlySetCreate = <T>(a: Iterable<T> = []): ReadonlySet<T> =>
new Set<T>(a);
export const iterableFlattenToArray = <T>(
a: Iterable<Iterable<T>> | IterableIterator<IterableIterator<T>>
) => {
const result = [];
for (const i of a) {
for (const j of i) {
result.push(j);
}
}
return result;
};
export const iterableFlattenToSet = <T>(
a: Iterable<Iterable<T>> | IterableIterator<IterableIterator<T>>
): Set<T> => {
const result = setCreate<T>();
for (const i of a) {
for (const j of i) {
result.add(j);
}
}
return result;
};
export const setUnion = <T>(
a: Set<T> | ReadonlySet<T>,
b: Set<T> | ReadonlySet<T>
) => new Set([...a, ...b]);
export const mapFilterKeys = <K, V>(
foo: ((v: V, k: K) => boolean),
map: Map<K, V>
): K[] => {
const filter = [];
for (const [k, v] of map) {
if (foo(v, k)) {
filter.push(k);
}
}
return filter;
};
export const mapFilterKeysIntoSet = <K, V>(
foo: ((v: V, k: K) => boolean),
map: Map<K, V>
): Set<K> => {
const filter = new Set();
for (const [k, v] of map) {
if (foo(v, k)) {
filter.add(k);
}
}
return filter;
};
export const mapFilter = <K, V>(
foo: ((v: V, k: K) => boolean),
map: Map<K, V>
): Map<K, V> => {
const newMap = new Map<K, V>();
for (const [k, v] of map) {
if (foo(v, k)) {
newMap.set(k, v);
}
}
return newMap;
};
export const mapFilterValuesIntoArray = <K, V>(
foo: ((v: V, k: K) => boolean),
map: Map<K, V>
): V[] => {
const filter = [];
for (const [k, v] of map) {
if (foo(v, k)) {
filter.push(v);
}
}
return filter;
};
export const last = <T>(r: T[]) => r[r.length - 1];
export const EitherCond = <T, K>(cond: boolean, left: T, right: K) =>
cond ? Left<T, K>(left) : Right<T, K>(right);
/**
* Returns Left(value) aka Error when fn(value) returns truthy else returns Right(error)
*/
export const ErrorWhen = <T, K>(fn: ((r: K) => boolean), error: T) => (
value: K
) => (fn(value) ? Left<T, K>(error) : Right<T, K>(value));
export class Err {
public static left<T = never>(err: Error): Either<Error, T> {
return Left<Error, T>(err);
}
public static right<T>(val: T): Either<Error, T> {
return Right(val);
}
}
export const foldEitherArray = <T, K>(arr: Array<Either<T, K>>) => {
const result: K[] = [];
for (const x of arr) {
if (x.isLeft()) {
return Left<T, K[]>(x.left());
}
result.push(x.right());
}
return Right<T, K[]>(result);
};
export const pass = <T>(f: (r: T) => any) => (r: T) => {
f(r);
return r;
};