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/**
* This module provides utility functions for working with Iterables in TypeScript.
*
* @since 2.0.0
*/
import * as E from "./Either.js";
import * as Equal from "./Equal.js";
import { dual, identity } from "./Function.js";
import * as O from "./Option.js";
import { isBoolean } from "./Predicate.js";
import * as Tuple from "./Tuple.js";
/**
* Return a `Iterable` with element `i` initialized with `f(i)`.
*
* If the `length` is not specified, the `Iterable` will be infinite.
*
* **Note**. `length` is normalized to an integer >= 1.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { makeBy } from "effect/Iterable"
*
* assert.deepStrictEqual(Array.from(makeBy(n => n * 2, { length: 5 })), [0, 2, 4, 6, 8])
* ```
*
* @category constructors
* @since 2.0.0
*/
export const makeBy = (f, options) => {
const max = options?.length !== undefined ? Math.max(1, Math.floor(options.length)) : Infinity;
return {
[Symbol.iterator]() {
let i = 0;
return {
next() {
if (i < max) {
return {
value: f(i++),
done: false
};
}
return {
done: true,
value: undefined
};
}
};
}
};
};
/**
* Return a `Iterable` containing a range of integers, including both endpoints.
*
* If `end` is omitted, the range will not have an upper bound.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { range } from "effect/Iterable"
*
* assert.deepStrictEqual(Array.from(range(1, 3)), [1, 2, 3])
* ```
*
* @category constructors
* @since 2.0.0
*/
export const range = (start, end) => {
if (end === undefined) {
return makeBy(i => start + i);
}
return makeBy(i => start + i, {
length: start <= end ? end - start + 1 : 1
});
};
/**
* Return a `Iterable` containing a value repeated the specified number of times.
*
* **Note**. `n` is normalized to an integer >= 1.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { replicate } from "effect/Iterable"
*
* assert.deepStrictEqual(Array.from(replicate("a", 3)), ["a", "a", "a"])
* ```
*
* @category constructors
* @since 2.0.0
*/
export const replicate = /*#__PURE__*/dual(2, (a, n) => makeBy(() => a, {
length: n
}));
/**
* Takes a record and returns an Iterable of tuples containing its keys and values.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { fromRecord } from "effect/Iterable"
*
* const x = { a: 1, b: 2, c: 3 }
* assert.deepStrictEqual(Array.from(fromRecord(x)), [["a", 1], ["b", 2], ["c", 3]])
* ```
*
* @category conversions
* @since 2.0.0
*/
export const fromRecord = self => ({
*[Symbol.iterator]() {
for (const key in self) {
if (Object.prototype.hasOwnProperty.call(self, key)) {
yield [key, self[key]];
}
}
}
});
/**
* Prepend an element to the front of an `Iterable`, creating a new `Iterable`.
*
* @category concatenating
* @since 2.0.0
*/
export const prepend = /*#__PURE__*/dual(2, (self, head) => prependAll(self, [head]));
/**
* Prepends the specified prefix iterable to the beginning of the specified iterable.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { Iterable } from "effect"
*
* assert.deepStrictEqual(
* Array.from(Iterable.prependAll([1, 2], ["a", "b"])),
* ["a", "b", 1, 2]
* )
* ```
*
* @category concatenating
* @since 2.0.0
*/
export const prependAll = /*#__PURE__*/dual(2, (self, that) => appendAll(that, self));
/**
* Append an element to the end of an `Iterable`, creating a new `Iterable`.
*
* @category concatenating
* @since 2.0.0
*/
export const append = /*#__PURE__*/dual(2, (self, last) => appendAll(self, [last]));
/**
* Concatenates two iterables, combining their elements.
*
* @category concatenating
* @since 2.0.0
*/
export const appendAll = /*#__PURE__*/dual(2, (self, that) => ({
[Symbol.iterator]() {
const iterA = self[Symbol.iterator]();
let doneA = false;
let iterB;
return {
next() {
if (!doneA) {
const r = iterA.next();
if (r.done) {
doneA = true;
iterB = that[Symbol.iterator]();
return iterB.next();
}
return r;
}
return iterB.next();
}
};
}
}));
/**
* Reduce an `Iterable` from the left, keeping all intermediate results instead of only the final result.
*
* @category folding
* @since 2.0.0
*/
export const scan = /*#__PURE__*/dual(3, (self, b, f) => ({
[Symbol.iterator]() {
let acc = b;
let iterator;
function next() {
if (iterator === undefined) {
iterator = self[Symbol.iterator]();
return {
done: false,
value: acc
};
}
const result = iterator.next();
if (result.done) {
return result;
}
acc = f(acc, result.value);
return {
done: false,
value: acc
};
}
return {
next
};
}
}));
/**
* Determine if an `Iterable` is empty
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { isEmpty } from "effect/Iterable"
*
* assert.deepStrictEqual(isEmpty([]), true);
* assert.deepStrictEqual(isEmpty([1, 2, 3]), false);
* ```
*
* @category guards
* @since 2.0.0
*/
export const isEmpty = self => {
const iterator = self[Symbol.iterator]();
return iterator.next().done === true;
};
/**
* Return the number of elements in a `Iterable`.
*
* @category getters
* @since 2.0.0
*/
export const size = self => {
const iterator = self[Symbol.iterator]();
let count = 0;
while (!iterator.next().done) {
count++;
}
return count;
};
/**
* Get the first element of a `Iterable`, or `None` if the `Iterable` is empty.
*
* @category getters
* @since 2.0.0
*/
export const head = self => {
const iterator = self[Symbol.iterator]();
const result = iterator.next();
return result.done ? O.none() : O.some(result.value);
};
/**
* Get the first element of a `Iterable`, or throw an error if the `Iterable` is empty.
*
* @category getters
* @since 3.3.0
*/
export const unsafeHead = self => {
const iterator = self[Symbol.iterator]();
const result = iterator.next();
if (result.done) throw new Error("unsafeHead: empty iterable");
return result.value;
};
/**
* Keep only a max number of elements from the start of an `Iterable`, creating a new `Iterable`.
*
* **Note**. `n` is normalized to a non negative integer.
*
* @category getters
* @since 2.0.0
*/
export const take = /*#__PURE__*/dual(2, (self, n) => ({
[Symbol.iterator]() {
let i = 0;
const iterator = self[Symbol.iterator]();
return {
next() {
if (i < n) {
i++;
return iterator.next();
}
return {
done: true,
value: undefined
};
}
};
}
}));
/**
* Calculate the longest initial Iterable for which all element satisfy the specified predicate, creating a new `Iterable`.
*
* @category getters
* @since 2.0.0
*/
export const takeWhile = /*#__PURE__*/dual(2, (self, predicate) => ({
[Symbol.iterator]() {
const iterator = self[Symbol.iterator]();
let i = 0;
return {
next() {
const result = iterator.next();
if (result.done || !predicate(result.value, i++)) {
return {
done: true,
value: undefined
};
}
return result;
}
};
}
}));
/**
* Drop a max number of elements from the start of an `Iterable`
*
* **Note**. `n` is normalized to a non negative integer.
*
* @category getters
* @since 2.0.0
*/
export const drop = /*#__PURE__*/dual(2, (self, n) => ({
[Symbol.iterator]() {
const iterator = self[Symbol.iterator]();
let i = 0;
return {
next() {
while (i < n) {
const result = iterator.next();
if (result.done) {
return {
done: true,
value: undefined
};
}
i++;
}
return iterator.next();
}
};
}
}));
/**
* Returns the first element that satisfies the specified
* predicate, or `None` if no such element exists.
*
* @category elements
* @since 2.0.0
*/
export const findFirst = /*#__PURE__*/dual(2, (self, f) => {
let i = 0;
for (const a of self) {
const o = f(a, i);
if (isBoolean(o)) {
if (o) {
return O.some(a);
}
} else {
if (O.isSome(o)) {
return o;
}
}
i++;
}
return O.none();
});
/**
* Find the last element for which a predicate holds.
*
* @category elements
* @since 2.0.0
*/
export const findLast = /*#__PURE__*/dual(2, (self, f) => {
let i = 0;
let last = O.none();
for (const a of self) {
const o = f(a, i);
if (isBoolean(o)) {
if (o) {
last = O.some(a);
}
} else {
if (O.isSome(o)) {
last = o;
}
}
i++;
}
return last;
});
/**
* Takes two `Iterable`s and returns an `Iterable` of corresponding pairs.
*
* @category zipping
* @since 2.0.0
*/
export const zip = /*#__PURE__*/dual(2, (self, that) => zipWith(self, that, Tuple.make));
/**
* Apply a function to pairs of elements at the same index in two `Iterable`s, collecting the results. If one
* input `Iterable` is short, excess elements of the longer `Iterable` are discarded.
*
* @category zipping
* @since 2.0.0
*/
export const zipWith = /*#__PURE__*/dual(3, (self, that, f) => ({
[Symbol.iterator]() {
const selfIterator = self[Symbol.iterator]();
const thatIterator = that[Symbol.iterator]();
return {
next() {
const selfResult = selfIterator.next();
const thatResult = thatIterator.next();
if (selfResult.done || thatResult.done) {
return {
done: true,
value: undefined
};
}
return {
done: false,
value: f(selfResult.value, thatResult.value)
};
}
};
}
}));
/**
* Places an element in between members of an `Iterable`.
* If the input is a non-empty array, the result is also a non-empty array.
*
* @since 2.0.0
*/
export const intersperse = /*#__PURE__*/dual(2, (self, middle) => ({
[Symbol.iterator]() {
const iterator = self[Symbol.iterator]();
let next = iterator.next();
let emitted = false;
return {
next() {
if (next.done) {
return next;
} else if (emitted) {
emitted = false;
return {
done: false,
value: middle
};
}
emitted = true;
const result = next;
next = iterator.next();
return result;
}
};
}
}));
/**
* Returns a function that checks if an `Iterable` contains a given value using a provided `isEquivalent` function.
*
* @category elements
* @since 2.0.0
*/
export const containsWith = isEquivalent => dual(2, (self, a) => {
for (const i of self) {
if (isEquivalent(a, i)) {
return true;
}
}
return false;
});
const _equivalence = /*#__PURE__*/Equal.equivalence();
/**
* Returns a function that checks if a `Iterable` contains a given value using the default `Equivalence`.
*
* @category elements
* @since 2.0.0
*/
export const contains = /*#__PURE__*/containsWith(_equivalence);
/**
* Splits an `Iterable` into length-`n` pieces. The last piece will be shorter if `n` does not evenly divide the length of
* the `Iterable`.
*
* @category splitting
* @since 2.0.0
*/
export const chunksOf = /*#__PURE__*/dual(2, (self, n) => {
const safeN = Math.max(1, Math.floor(n));
return {
[Symbol.iterator]() {
let iterator = self[Symbol.iterator]();
return {
next() {
if (iterator === undefined) {
return {
done: true,
value: undefined
};
}
const chunk = [];
for (let i = 0; i < safeN; i++) {
const result = iterator.next();
if (result.done) {
iterator = undefined;
return chunk.length === 0 ? {
done: true,
value: undefined
} : {
done: false,
value: chunk
};
}
chunk.push(result.value);
}
return {
done: false,
value: chunk
};
}
};
}
};
});
/**
* Group equal, consecutive elements of an `Iterable` into `NonEmptyArray`s using the provided `isEquivalent` function.
*
* @category grouping
* @since 2.0.0
*/
export const groupWith = /*#__PURE__*/dual(2, (self, isEquivalent) => ({
[Symbol.iterator]() {
const iterator = self[Symbol.iterator]();
let nextResult;
return {
next() {
let result;
if (nextResult !== undefined) {
if (nextResult.done) {
return {
done: true,
value: undefined
};
}
result = nextResult;
nextResult = undefined;
} else {
result = iterator.next();
if (result.done) {
return {
done: true,
value: undefined
};
}
}
const chunk = [result.value];
while (true) {
const next = iterator.next();
if (next.done || !isEquivalent(result.value, next.value)) {
nextResult = next;
return {
done: false,
value: chunk
};
}
chunk.push(next.value);
}
}
};
}
}));
/**
* Group equal, consecutive elements of an `Iterable` into `NonEmptyArray`s.
*
* @category grouping
* @since 2.0.0
*/
export const group = /*#__PURE__*/groupWith(/*#__PURE__*/Equal.equivalence());
/**
* Splits an `Iterable` into sub-non-empty-arrays stored in an object, based on the result of calling a `string`-returning
* function on each element, and grouping the results according to values returned
*
* @category grouping
* @since 2.0.0
*/
export const groupBy = /*#__PURE__*/dual(2, (self, f) => {
const out = {};
for (const a of self) {
const k = f(a);
if (Object.prototype.hasOwnProperty.call(out, k)) {
out[k].push(a);
} else {
out[k] = [a];
}
}
return out;
});
const constEmpty = {
[Symbol.iterator]() {
return constEmptyIterator;
}
};
const constEmptyIterator = {
next() {
return {
done: true,
value: undefined
};
}
};
/**
* @category constructors
* @since 2.0.0
*/
export const empty = () => constEmpty;
/**
* Constructs a new `Iterable<A>` from the specified value.
*
* @category constructors
* @since 2.0.0
*/
export const of = a => [a];
/**
* @category mapping
* @since 2.0.0
*/
export const map = /*#__PURE__*/dual(2, (self, f) => ({
[Symbol.iterator]() {
const iterator = self[Symbol.iterator]();
let i = 0;
return {
next() {
const result = iterator.next();
if (result.done) {
return {
done: true,
value: undefined
};
}
return {
done: false,
value: f(result.value, i++)
};
}
};
}
}));
/**
* Applies a function to each element in an Iterable and returns a new Iterable containing the concatenated mapped elements.
*
* @category sequencing
* @since 2.0.0
*/
export const flatMap = /*#__PURE__*/dual(2, (self, f) => flatten(map(self, f)));
/**
* Flattens an Iterable of Iterables into a single Iterable
*
* @category sequencing
* @since 2.0.0
*/
export const flatten = self => ({
[Symbol.iterator]() {
const outerIterator = self[Symbol.iterator]();
let innerIterator;
function next() {
if (innerIterator === undefined) {
const next = outerIterator.next();
if (next.done) {
return next;
}
innerIterator = next.value[Symbol.iterator]();
}
const result = innerIterator.next();
if (result.done) {
innerIterator = undefined;
return next();
}
return result;
}
return {
next
};
}
});
/**
* @category filtering
* @since 2.0.0
*/
export const filterMap = /*#__PURE__*/dual(2, (self, f) => ({
[Symbol.iterator]() {
const iterator = self[Symbol.iterator]();
let i = 0;
return {
next() {
let result = iterator.next();
while (!result.done) {
const b = f(result.value, i++);
if (O.isSome(b)) {
return {
done: false,
value: b.value
};
}
result = iterator.next();
}
return {
done: true,
value: undefined
};
}
};
}
}));
/**
* Transforms all elements of the `Iterable` for as long as the specified function returns some value
*
* @category filtering
* @since 2.0.0
*/
export const filterMapWhile = /*#__PURE__*/dual(2, (self, f) => ({
[Symbol.iterator]() {
const iterator = self[Symbol.iterator]();
let i = 0;
return {
next() {
const result = iterator.next();
if (result.done) {
return {
done: true,
value: undefined
};
}
const b = f(result.value, i++);
if (O.isSome(b)) {
return {
done: false,
value: b.value
};
}
return {
done: true,
value: undefined
};
}
};
}
}));
/**
* Retrieves the `Some` values from an `Iterable` of `Option`s.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { Iterable, Option } from "effect"
*
* assert.deepStrictEqual(
* Array.from(Iterable.getSomes([Option.some(1), Option.none(), Option.some(2)])),
* [1, 2]
* )
* ```
*
* @category filtering
* @since 2.0.0
*/
export const getSomes = /*#__PURE__*/filterMap(identity);
/**
* Retrieves the `Left` values from an `Iterable` of `Either`s.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { Iterable, Either } from "effect"
*
* assert.deepStrictEqual(
* Array.from(Iterable.getLefts([Either.right(1), Either.left("err"), Either.right(2)])),
* ["err"]
* )
* ```
*
* @category filtering
* @since 2.0.0
*/
export const getLefts = self => filterMap(self, E.getLeft);
/**
* Retrieves the `Right` values from an `Iterable` of `Either`s.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { Iterable, Either } from "effect"
*
* assert.deepStrictEqual(
* Array.from(Iterable.getRights([Either.right(1), Either.left("err"), Either.right(2)])),
* [1, 2]
* )
* ```
*
* @category filtering
* @since 2.0.0
*/
export const getRights = self => filterMap(self, E.getRight);
/**
* @category filtering
* @since 2.0.0
*/
export const filter = /*#__PURE__*/dual(2, (self, predicate) => ({
[Symbol.iterator]() {
const iterator = self[Symbol.iterator]();
let i = 0;
return {
next() {
let result = iterator.next();
while (!result.done) {
if (predicate(result.value, i++)) {
return {
done: false,
value: result.value
};
}
result = iterator.next();
}
return {
done: true,
value: undefined
};
}
};
}
}));
/**
* @category sequencing
* @since 2.0.0
*/
export const flatMapNullable = /*#__PURE__*/dual(2, (self, f) => filterMap(self, a => {
const b = f(a);
return b == null ? O.none() : O.some(b);
}));
/**
* Check if a predicate holds true for some `Iterable` element.
*
* @category elements
* @since 2.0.0
*/
export const some = /*#__PURE__*/dual(2, (self, predicate) => {
let i = 0;
for (const a of self) {
if (predicate(a, i++)) {
return true;
}
}
return false;
});
/**
* @category constructors
* @since 2.0.0
*/
export const unfold = (b, f) => ({
[Symbol.iterator]() {
let next = b;
return {
next() {
const o = f(next);
if (O.isNone(o)) {
return {
done: true,
value: undefined
};
}
const [a, b] = o.value;
next = b;
return {
done: false,
value: a
};
}
};
}
});
/**
* Iterate over the `Iterable` applying `f`.
*
* @since 2.0.0
*/
export const forEach = /*#__PURE__*/dual(2, (self, f) => {
let i = 0;
for (const a of self) {
f(a, i++);
}
});
/**
* @category folding
* @since 2.0.0
*/
export const reduce = /*#__PURE__*/dual(3, (self, b, f) => {
if (Array.isArray(self)) {
return self.reduce(f, b);
}
let i = 0;
let result = b;
for (const n of self) {
result = f(result, n, i++);
}
return result;
});
/**
* Deduplicates adjacent elements that are identical using the provided `isEquivalent` function.
*
* @since 2.0.0
*/
export const dedupeAdjacentWith = /*#__PURE__*/dual(2, (self, isEquivalent) => ({
[Symbol.iterator]() {
const iterator = self[Symbol.iterator]();
let first = true;
let last;
function next() {
const result = iterator.next();
if (result.done) {
return {
done: true,
value: undefined
};
}
if (first) {
first = false;
last = result.value;
return result;
}
const current = result.value;
if (isEquivalent(last, current)) {
return next();
}
last = current;
return result;
}
return {
next
};
}
}));
/**
* Deduplicates adjacent elements that are identical.
*
* @since 2.0.0
*/
export const dedupeAdjacent = /*#__PURE__*/dedupeAdjacentWith(/*#__PURE__*/Equal.equivalence());
/**
* Zips this Iterable crosswise with the specified Iterable using the specified combiner.
*
* @since 2.0.0
* @category elements
*/
export const cartesianWith = /*#__PURE__*/dual(3, (self, that, f) => flatMap(self, a => map(that, b => f(a, b))));
/**
* Zips this Iterable crosswise with the specified Iterable.
*
* @since 2.0.0
* @category elements
*/
export const cartesian = /*#__PURE__*/dual(2, (self, that) => cartesianWith(self, that, (a, b) => [a, b]));
/**
* Counts all the element of the given iterable that pass the given predicate
*
* **Example**
*
* ```ts
* import { Iterable } from "effect"
*
* const result = Iterable.countBy([1, 2, 3, 4, 5], n => n % 2 === 0)
* console.log(result) // 2
* ```
*
* @category folding
* @since 3.16.0
*/
export const countBy = /*#__PURE__*/dual(2, (self, f) => {
let count = 0;
let i = 0;
for (const a of self) {
if (f(a, i)) {
count++;
}
i++;
}
return count;
});
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