@ldrick/trade-indicators/dist/utils/array.js

Trade Indicators

import { either as E, function as F, readonlyArray as RA, readonlyNonEmptyArray as RNEA, } from 'fp-ts';
import { EmptyArrayError } from '../errors/EmptyArrayError.js';
import { NotEnoughDataError } from '../errors/NotEnoughDataError.js';
import * as big from './big.js';
import * as num from './number.js';
/**
 * Safely convert `RNEA.ReadonlyNonEmptyArray<number>` to `RNEA.ReadonlyNonEmptyArray<Big>`.
 *
 * @internal
 */
export const toBig = RNEA.traverse(E.Applicative)(num.toBig);
/**
 * Convert `RNEA.ReadonlyNonEmptyArray<Big>` to `RNEA.ReadonlyNonEmptyArray<number>`.
 *
 * @internal
 */
export const toNumber = (values) => RNEA.map(big.toNumber)(values);
/**
 * Create new Array from given and fill left with value up to given size.
 *
 * @internal
 */
export const fillLeftW = (size, value) => (tail) => F.pipe(size > tail.length ? size - tail.length : 0, (times) => RA.replicate(times, value), RNEA.concatW(tail));
/**
 * Get all but the first of an `ReadonlyNonEmptyArray` as `ReadonlyNonEmptyArray`
 *
 * @internal
 */
export const tail = (array) => F.pipe(array, RNEA.tail, (rest) => RA.isNonEmpty(rest) ? E.right(rest) : E.left(new EmptyArrayError()));
/**
 * Validates if an Array has the required size.
 *
 * @internal
 */
export const validateRequiredSize = (required) => (array) => RA.isNonEmpty(array) && array.length >= required
    ? E.right(array)
    : E.left(new NotEnoughDataError(array.length, required));