"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.replace = exports.move = exports.splice = exports.reduce = exports.map = exports.filter = exports.concurrentFilter = exports.conform = void 0;
function conform(t) {
if (typeof t === 'undefined') {
return [];
}
if (!Array.isArray(t)) {
return [t];
}
return t;
}
exports.conform = conform;
async function concurrentFilter(array, callback) {
const mapper = async (v) => [v, await callback(v)];
const mapped = await Promise.all(array.map(mapper));
return mapped
.filter(([, f]) => f)
.map(([v]) => v);
}
exports.concurrentFilter = concurrentFilter;
async function filter(array, callback) {
const initial = [];
return reduce(array, async (acc, v, i, arr) => {
if (await callback(v, i, arr)) {
acc.push(v);
}
return acc;
}, initial);
}
exports.filter = filter;
async function map(array, callback) {
const initial = [];
return reduce(array, async (acc, v, i, arr) => {
acc.push(await callback(v, i, arr));
return acc;
}, initial);
}
exports.map = map;
async function reduce(array, callback, initialValue) {
const hadInitialValue = typeof initialValue === 'undefined';
const startingIndex = hadInitialValue ? 1 : 0;
if (typeof initialValue === 'undefined') {
if (array.length === 0) {
throw new TypeError('Reduce of empty array with no initial value');
}
initialValue = array[0];
}
let value = initialValue;
for (let i = startingIndex; i < array.length; i++) {
const v = await callback(value, array[i], i, array);
value = v;
}
return value;
}
exports.reduce = reduce;
/**
* Splice an array.
*
* This function will return a new array with the standard splice behavior
* applied. Unlike the standard array splice, the array of removed items is not
* returned.
*/
function splice(array, start, deleteCount = array.length - start, ...items) {
const result = [...array];
result.splice(start, deleteCount, ...items);
return result;
}
exports.splice = splice;
/**
* Move an item in an array by index.
*
* This function will return a new array with the item in the `fromIndex`
* position moved to the `toIndex` position. If `fromIndex` or `toIndex` are
* out of bounds, the array items remain unmoved.
*/
function move(array, fromIndex, toIndex) {
const element = array[fromIndex];
if (fromIndex < 0 || toIndex < 0 || fromIndex >= array.length || toIndex >= array.length) {
return [...array];
}
return splice(splice(array, fromIndex, 1), toIndex, 0, element);
}
exports.move = move;
/**
* Replace an item in an array by index.
*
* This function will return a new array with the item in the `index` position
* replaced with `item`. If `index` is out of bounds, the item is not replaced.
*/
function replace(array, index, item) {
if (index < 0 || index > array.length) {
return [...array];
}
return splice(array, index, 1, item);
}
exports.replace = replace;