// ♓🌟 Piscēs ∷ collection.js
// ====================================================================
//
-// Copyright © 2020–2022 Lady [@ Lady’s Computer].
+// Copyright © 2020–2023 Lady [@ Lady’s Computer].
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at <https://mozilla.org/MPL/2.0/>.
-import { MAX_SAFE_INTEGER } from "./numeric.js";
-import { isObject } from "./object.js";
+import { call, makeCallable } from "./function.js";
+import {
+ floor,
+ isIntegralNumber,
+ isNan,
+ max,
+ MAXIMUM_SAFE_INTEGRAL_NUMBER,
+ min,
+} from "./numeric.js";
+import { sameValue, type } from "./value.js";
+
+const { prototype: arrayPrototype } = Array;
+
+export const {
+ /** Returns an array of the provided values. */
+ of: array,
+
+ /** Returns whether the provided value is an array. */
+ isArray,
+
+ /** Returns an array created from the provided arraylike. */
+ from: toArray,
+} = Array;
/**
- * Returns -0 if the provided argument is "-0"; returns a number
+ * Returns −0 if the provided argument is "-0"; returns a number
* representing the index if the provided argument is a canonical
* numeric index string; otherwise, returns undefined.
*
* There is no clamping of the numeric index, but note that numbers
- * above 2^53 − 1 are not safe nor valid integer indices.
+ * above 2^53 − 1 are not safe nor valid integer indices.
*/
export const canonicalNumericIndexString = ($) => {
- if (typeof $ != "string") {
+ if (typeof $ !== "string") {
return undefined;
} else if ($ === "-0") {
return -0;
}
};
-/** Returns whether the provided value is an array index. */
-export const isArrayIndex = ($) => {
+/**
+ * Returns the result of catenating the provided arraylikes into a new
+ * collection according to the algorithm of `Array::concat`.
+ */
+export const catenate = makeCallable(arrayPrototype.concat);
+
+/**
+ * Copies the items in the provided object to a new location according
+ * to the algorithm of `Array::copyWithin`.
+ */
+export const copyWithin = makeCallable(arrayPrototype.copyWithin);
+
+/**
+ * Fills the provided object with the provided value according to the
+ * algorithm of `Array::fill`.
+ */
+export const fill = makeCallable(arrayPrototype.fill);
+
+/**
+ * Returns the result of filtering the provided object with the
+ * provided callback, according to the algorithm of `Array::filter`.
+ */
+export const filter = makeCallable(arrayPrototype.filter);
+
+/**
+ * Returns the first index in the provided object whose value satisfies
+ * the provided callback according to the algorithm of
+ * `Array::findIndex`.
+ */
+export const findIndex = makeCallable(arrayPrototype.findIndex);
+
+/**
+ * Returns the first indexed entry in the provided object whose value
+ * satisfies the provided callback.
+ *
+ * If a third argument is supplied, it will be used as the this value
+ * of the callback.
+ */
+export const findIndexedEntry = (
+ $,
+ callback,
+ thisArg = undefined,
+) => {
+ let result = undefined;
+ findItem($, (kValue, k, O) => {
+ if (call(callback, thisArg, [kValue, k, O])) {
+ // The callback succeeded.
+ result = [k, kValue];
+ return true;
+ } else {
+ // The callback failed.
+ return false;
+ }
+ });
+ return result;
+};
+
+/**
+ * Returns the first indexed value in the provided object which
+ * satisfies the provided callback, according to the algorithm of
+ * `Array::find`.
+ */
+export const findItem = makeCallable(arrayPrototype.find);
+
+/**
+ * Returns the result of flatmapping the provided value with the
+ * provided callback according to the algorithm of `Array::flatMap`.
+ */
+export const flatmap = makeCallable(arrayPrototype.flatMap);
+
+/**
+ * Returns the result of flattening the provided object according to
+ * the algorithm of `Array::flat`.
+ */
+export const flatten = makeCallable(arrayPrototype.flat);
+
+/**
+ * Returns the first index of the provided object with a value
+ * equivalent to the provided value according to the algorithm of
+ * `Array::indexOf`.
+ */
+export const getFirstIndex = makeCallable(arrayPrototype.indexOf);
+
+/**
+ * Returns the item on the provided object at the provided index
+ * according to the algorithm of `Array::at`.
+ */
+export const getItem = makeCallable(arrayPrototype.at);
+
+/**
+ * Returns the last index of the provided object with a value
+ * equivalent to the provided value according to the algorithm of
+ * `Array::lastIndexOf`.
+ */
+export const getLastIndex = makeCallable(arrayPrototype.lastIndexOf);
+
+/**
+ * Returns whether every indexed value in the provided object satisfies
+ * the provided function, according to the algorithm of `Array::every`.
+ */
+export const hasEvery = makeCallable(arrayPrototype.every);
+
+/**
+ * Returns whether the provided object has an indexed value which
+ * satisfies the provided function, according to the algorithm of
+ * `Array::some`.
+ */
+export const hasSome = makeCallable(arrayPrototype.some);
+
+/**
+ * Returns whether the provided object has an indexed value equivalent
+ * to the provided value according to the algorithm of
+ * `Array::includes`.
+ *
+ * ※ This algorithm treats missing values as `undefined` rather than
+ * skipping them.
+ */
+export const includes = makeCallable(arrayPrototype.includes);
+
+/**
+ * Returns an iterator over the indexed entries in the provided value
+ * according to the algorithm of `Array::entries`.
+ */
+export const indexedEntries = makeCallable(arrayPrototype.entries);
+
+/**
+ * Returns an iterator over the indices in the provided value according
+ * to the algorithm of `Array::keys`.
+ */
+export const indices = makeCallable(arrayPrototype.keys);
+
+/** Returns whether the provided value is an array index string. */
+export const isArrayIndexString = ($) => {
const value = canonicalNumericIndexString($);
if (value !== undefined) {
- return Object.is(value, 0) || value > 0 && value < -1 >>> 0;
+ // The provided value is a canonical numeric index string.
+ return sameValue(value, 0) || value > 0 && value < -1 >>> 0 &&
+ value === toLength(value);
} else {
+ // The provided value is not a canonical numeric index string.
+ return false;
+ }
+};
+
+/** Returns whether the provided value is arraylike. */
+export const isArraylikeObject = ($) => {
+ if (type($) !== "object") {
return false;
+ } else {
+ try {
+ lengthOfArraylike($); // throws if not arraylike
+ return true;
+ } catch {
+ return false;
+ }
}
};
*
* The definition of “collection” used by Piscēs is similar to
* Ecmascript’s definition of an arraylike object, but it differs in
- * a few ways :—
+ * a few ways :—
*
* - It requires the provided value to be a proper object.
*
- * - It requires the `length` property to be an integer corresponding
- * to an integer index.
+ * - It requires the `length` property to be an integer index.
*
* - It requires the object to be concat‐spreadable, meaning it must
- * either be an array or have `[Symbol.isConcatSpreadable]` be true.
+ * either be an array or have `.[Symbol.isConcatSpreadable]` be true.
*/
export const isCollection = ($) => {
- if (!(isObject($) && "length" in $)) {
+ if (!(type($) === "object" && "length" in $)) {
// The provided value is not an object or does not have a `length`.
return false;
} else {
* collections.
*/
export const isConcatSpreadable = ($) => {
- if (!isObject($)) {
+ if (type($) !== "object") {
// The provided value is not an object.
return false;
} else {
// The provided value is an object.
- return !!($[Symbol.isConcatSpreadable] ?? Array.isArray($));
+ const spreadable = $[Symbol.isConcatSpreadable];
+ return spreadable !== undefined ? !!spreadable : isArray($);
}
};
-/** Returns whether the provided value is an integer index. */
-export const isIntegerIndex = ($) => {
+/** Returns whether the provided value is an integer index string. */
+export const isIntegerIndexString = ($) => {
const value = canonicalNumericIndexString($);
- if (value !== undefined) {
- return Object.is(value, 0) ||
- value > 0 && value <= MAX_SAFE_INTEGER;
+ if (value !== undefined && isIntegralNumber(value)) {
+ // The provided value is a canonical numeric index string.
+ return sameValue(value, 0) ||
+ value > 0 && value <= MAXIMUM_SAFE_INTEGRAL_NUMBER &&
+ value === toLength(value);
} else {
+ // The provided value is not a canonical numeric index string.
return false;
}
};
+/**
+ * Returns an iterator over the items in the provided value according
+ * to the algorithm of `Array::values`.
+ */
+export const items = makeCallable(arrayPrototype.values);
+
/**
* Returns the length of the provided arraylike object.
*
* Will throw if the provided object is not arraylike.
*
- * This produces larger lengths than can actually be stored in arrays,
- * because no such restrictions exist on arraylike methods. Use
- * `isIndex` to determine if a value is an actual array index.
+ * This can produce larger lengths than can actually be stored in
+ * arrays, because no such restrictions exist on arraylike methods.
*/
-export const lengthOfArrayLike = ({ length }) => {
- return toLength(length);
-};
+export const lengthOfArraylike = ({ length }) => toLength(length);
+
+/**
+ * Returns the result of mapping the provided value with the provided
+ * callback according to the algorithm of `Array::map`.
+ */
+export const map = makeCallable(arrayPrototype.map);
+
+/**
+ * Pops from the provided value according to the algorithm of
+ * `Array::pop`.
+ */
+export const pop = makeCallable(arrayPrototype.pop);
+
+/**
+ * Pushes onto the provided value according to the algorithm of
+ * `Array::push`.
+ */
+export const push = makeCallable(arrayPrototype.push);
+
+/**
+ * Returns the result of reducing the provided value with the provided
+ * callback, according to the algorithm of `Array::reduce`.
+ */
+export const reduce = makeCallable(arrayPrototype.reduce);
+
+/**
+ * Reverses the provided value according to the algorithm of
+ * `Array::reverse`.
+ */
+export const reverse = makeCallable(arrayPrototype.reverse);
+
+/**
+ * Shifts the provided value according to the algorithm of
+ * `Array::shift`.
+ */
+export const shift = makeCallable(arrayPrototype.shift);
+
+/**
+ * Returns a slice of the provided value according to the algorithm of
+ * `Array::slice`.
+ */
+export const slice = makeCallable(arrayPrototype.slice);
+
+/**
+ * Sorts the provided value in‐place according to the algorithm of
+ * `Array::sort`.
+ */
+export const sort = makeCallable(arrayPrototype.sort);
/**
- * Converts the provided value to an array index, or throws an error if
- * it is out of range.
+ * Splices into and out of the provided value according to the
+ * algorithm of `Array::splice`.
+ */
+export const splice = makeCallable(arrayPrototype.splice);
+
+/**
+ * Returns the result of converting the provided value to an array
+ * index, or throws an error if it is out of range.
*/
export const toIndex = ($) => {
- const integer = Math.floor($);
- if (isNaN(integer) || integer == 0) {
+ const integer = floor($);
+ if (isNan(integer) || integer == 0) {
// The value is zero·like.
return 0;
} else {
}
};
-/** Converts the provided value to a length. */
+/** Returns the result of converting the provided value to a length. */
export const toLength = ($) => {
- const len = Math.floor($);
- return isNaN(len) || len == 0
+ const len = floor($);
+ return isNan(len) || len == 0
? 0
- : Math.max(Math.min(len, MAX_SAFE_INTEGER), 0);
+ : max(min(len, MAXIMUM_SAFE_INTEGRAL_NUMBER), 0);
};
+
+/**
+ * Unshifts the provided value according to the algorithm of
+ * `Array::unshift`.
+ */
+export const unshift = makeCallable(arrayPrototype.unshift);
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