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array.ts
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array.ts
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import {Resolvable} from '.';
export type EachHandler<T> = (
value: T,
index: number,
values: T[],
) => Resolvable<void | boolean>;
/**
* Asynchronous version of `Array#forEach()`.
*/
export async function each<T>(
values: T[],
handler: EachHandler<T>,
): Promise<boolean> {
for (let i = 0; i < values.length; i++) {
if ((await handler(values[i], i, values)) === false) {
return false;
}
}
return true;
}
export type SomeHandler<T> = (
value: T,
index: number,
values: T[],
) => Resolvable<boolean>;
/**
* Asynchronous version of `Array#some()`.
*/
export async function some<T>(
values: T[],
handler: SomeHandler<T>,
): Promise<boolean> {
for (let i = 0; i < values.length; i++) {
if (await handler(values[i], i, values)) {
return true;
}
}
return false;
}
export type EveryHandler<T> = (
value: T,
index: number,
values: T[],
) => Resolvable<boolean>;
/**
* Asynchronous version of `Array#every()`.
*/
export async function every<T>(
values: T[],
handler: EveryHandler<T>,
): Promise<boolean> {
for (let i = 0; i < values.length; i++) {
if (!await handler(values[i], i, values)) {
return false;
}
}
return true;
}
export type MapTransformer<T, TResult> = (
value: T,
index: number,
values: T[],
) => Resolvable<TResult>;
/**
* Asynchronous version of `Array#map()` with basic concurrency control.
*/
export async function map<T, TResult>(
values: T[],
transformer: MapTransformer<T, TResult>,
concurrency?: number,
): Promise<TResult[]> {
if (typeof concurrency !== 'number') {
return Promise.all(values.map(transformer));
}
return new Promise<TResult[]>((resolve, reject) => {
let starting = Math.min(concurrency, values.length);
let results = [] as TResult[];
if (starting <= 0) {
resolve(results);
return;
}
let pending = 0;
let i = 0;
while (i < starting) {
next();
}
function next(): void {
if (i === values.length) {
if (!pending) {
resolve(results);
}
return;
}
let index = i++;
let value = values[index];
pending++;
let ret: Resolvable<TResult>;
try {
ret = transformer(value, index, values);
} catch (error) {
reject(error);
return;
}
Promise.resolve(ret).then(
result => {
results[index] = result;
pending--;
next();
},
error => {
reject(error);
},
);
}
});
}
export type ReduceTransformer<T, TResult> = (
result: TResult,
value: T,
index: number,
values: T[],
) => Resolvable<TResult>;
/**
* Asynchronous version of `Array#reduce()`.
*/
export async function reduce<T, TResult>(
values: T[],
transformer: ReduceTransformer<T, TResult>,
initial: TResult,
): Promise<TResult>;
export async function reduce<T>(
values: T[],
transformer: ReduceTransformer<T, T>,
): Promise<T | undefined>;
export async function reduce<T, TResult>(
values: T[],
transformer: ReduceTransformer<T, TResult>,
...args: any[]
): Promise<TResult | undefined> {
return (values.reduce as Function)(
async (result: TResult, value: T, index: number) => {
return transformer(await result, value, index, values);
},
...args,
);
}
/**
* Asynchronous version of `Array#reduceRight()`.
*/
export async function reduceRight<T, TResult>(
values: T[],
transformer: ReduceTransformer<T, TResult>,
initial: TResult,
): Promise<TResult>;
export async function reduceRight<T>(
values: T[],
transformer: ReduceTransformer<T, T>,
): Promise<T | undefined>;
export async function reduceRight<T, TResult>(
values: T[],
transformer: ReduceTransformer<T, TResult>,
...args: any[]
): Promise<TResult | undefined> {
return (values.reduceRight as Function)(
async (result: TResult, value: T, index: number) => {
return transformer(await result, value, index, values);
},
...args,
);
}
export type FilterHandler<T> = (
value: T,
index: number,
values: T[],
) => Resolvable<boolean>;
/**
* Asynchronous version of `Array#filter()`.
*/
export async function filter<T>(
values: T[],
handler: FilterHandler<T>,
): Promise<T[]> {
let results = [] as T[];
for (let i = 0; i < values.length; i++) {
let value = values[i];
if (await handler(value, i, values)) {
results.push(value);
}
}
return results;
}
export type FindHandler<T> = (
value: T,
index: number,
values: T[],
) => Resolvable<boolean>;
/**
* Asynchronous version of `Array#find()`.
*/
export async function find<T>(
values: T[],
handler: FindHandler<T>,
): Promise<T | undefined> {
for (let i = 0; i < values.length; i++) {
let value = values[i];
if (await handler(value, i, values)) {
return value;
}
}
return undefined;
}
/**
* Asynchronous version of `Array#findIndex()`.
*/
export async function findIndex<T>(
values: T[],
handler: FindHandler<T>,
): Promise<number> {
for (let i = 0; i < values.length; i++) {
if (await handler(values[i], i, values)) {
return i;
}
}
return -1;
}