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arrayList.ts
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arrayList.ts
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import { splice } from 'src/utils/arrayUtils';
import { clamp, wrapLeft } from 'src/math/numberUtils';
import { CompareFn } from '..';
import { List } from './list';
/**
* An implementation of the {@link List} interface using an array
*/
export class ArrayList<T> implements List<T> {
/**
* The array containing every element.
*/
protected array: Array<T>;
/**
* Instantiate the list.
*
* @param elements - A set of elements to initialize the list with.
*/
constructor(elements?: Iterable<T>) {
this.array = elements ? Array.from(elements) : [];
}
add(index: number, element: T): number {
if (index >= 0 && index <= this.size) {
this.array.splice(index, 0, element);
}
return this.size;
}
addAll(index: number, elements: Iterable<T>): number {
if (index >= 0 && index <= this.size) {
splice(this.array, index, 0, Array.from(elements));
}
return this.size;
}
clear(): void {
this.array.length = 0;
}
concat(...lists: Iterable<T>[]): ArrayList<T> {
const out = new ArrayList(this);
for (const list of lists) {
out.addAll(out.size, list);
}
return out;
}
copyWithin(index: number, min?: number, max?: number): this {
index = clamp(wrapLeft(index, 0, this.size), 0, this.size);
min = clamp(wrapLeft(min ?? 0, 0, this.size), 0, this.size);
max = clamp(wrapLeft(max ?? this.size, 0, this.size), 0, this.size);
this.array.copyWithin(index, min, max);
return this;
}
fill(element: T, min?: number, max?: number): this {
min = clamp(wrapLeft(min ?? 0, 0, this.size), 0, this.size);
max = clamp(wrapLeft(max ?? this.size, 0, this.size), 0, this.size);
this.array.fill(element, min, max);
return this;
}
get(index: number): T | undefined {
return index < 0 || index >= this.size ? undefined : this.array[index];
}
getSet(index: number, callback: (element: T) => T): T | undefined {
let value: T | undefined = undefined;
if (index >= 0 && index < this.size) {
value = this.array[index];
this.array[index] = callback(value);
}
return value;
}
pop(): T | undefined {
return this.array.pop();
}
push(element: T): number {
return this.array.push(element);
}
remove(index: number): T | undefined {
return index < 0 || index >= this.size ? undefined : this.array.splice(index, 1)[0];
}
reverse(min?: number, max?: number): this {
min = clamp(wrapLeft(min ?? 0, 0, this.size), 0, this.size);
max = clamp(wrapLeft(max ?? this.size, 0, this.size), 0, this.size) - 1;
while (min < max) {
const temp = this.array[min];
this.array[min++] = this.array[max];
this.array[max--] = temp;
}
return this;
}
set(index: number, element: T): T | undefined {
let prev: T | undefined = undefined;
if (index >= 0 && index < this.size) {
prev = this.array[index];
this.array[index] = element;
}
return prev;
}
shift(): T | undefined {
return this.array.shift();
}
get size(): number {
return this.array.length;
}
slice(min?: number, max?: number): ArrayList<T> {
return new ArrayList(this.array.slice(min, max));
}
splice(start?: number, count?: number, elements?: Iterable<T>): List<T> {
return new ArrayList(splice(this.array, start, count, Array.from(elements || [])));
}
sort(compareFn: CompareFn<T>): this {
this.array.sort(compareFn);
return this;
}
/**
* Receive an iterator through the list.
*
* **Note:** Unexpected behavior can occur if the collection is modified during iteration.
*
* @returns An iterator through the list
*/
[Symbol.iterator](): Iterator<T> {
return this.array[Symbol.iterator]();
}
unshift(element: T): number {
return this.array.unshift(element);
}
update(callback: (element: T, index: number) => T): this;
update(min: number | undefined, callback: (element: T, index: number) => T): this;
update(
min: number | undefined,
max: number | undefined,
callback: (element: T, index: number) => T,
): this;
update(
min: number | undefined | ((element: T, index: number) => T),
max?: number | ((element: T, index: number) => T),
callback?: (element: T, index: number) => T,
): this {
if (callback == null) {
if (arguments.length < 2) {
callback = min as (element: T, index: number) => T;
min = undefined;
} else {
callback = max as (element: T, index: number) => T;
max = undefined;
}
}
min = clamp(wrapLeft((min as number) ?? 0, 0, this.size), 0, this.size);
max = clamp(wrapLeft((max as number) ?? this.size, 0, this.size), 0, this.size);
while (min < max) {
this.array[min] = callback(this.array[min], min);
++min;
}
return this;
}
*view(min?: number, max?: number): Iterable<T> {
min = clamp(wrapLeft(min ?? 0, 0, this.size), 0, this.size);
let len: () => number;
if (max == null) {
len = () => this.size;
} else if (max >= 0) {
len = () => Math.min(max, this.size);
} else {
len = () => this.size + max;
}
while (min < len()) {
yield this.array[min++];
}
}
}