datum-focus/src/array.ts

Data shape, model, metadata, JSON, JSON Schema, GraphQL, MongoDB query and aggregations, iterator generators

import { BooleanType } from './boolean';
import { FUNCTION } from "./function";
import { Nil } from './maybe';
import { NumberType } from './number';
import { RecordType } from './record';
import { StringType } from './string';

export const ARRAY = "array";

export type ArrayType =
  | [ArrayType | BooleanType | NumberType | StringType, typeof ARRAY]
  | [string, RecordType, typeof ARRAY];

export const isArray = <T = unknown>(val: unknown): val is Array<T> =>
  Array.isArray(val);

export const isArrayLike = (
  val: any
): val is IterableIterator<[number, unknown]> =>
  typeof val[Symbol.iterator] === FUNCTION;

export const isEmpty = (val: unknown): val is Nil =>
  !isArray(val) || val.length === 0;

export const isSet = (val: unknown): val is Set<unknown> =>
  isArrayLike(val) && !isArray(val);

    /*
export const isSorted = (arr: Array<number>): false | 1 | -1 => {
  let direction = -(arr[0] - arr[1]);
  for (let [i, val] of arr.entries()) {
    direction = !direction ? -(arr[i - 1] - arr[i]) : direction;
    if (i === arr.length - 1) {
      return !direction ? false : <1 | -1>(direction / Math.abs(direction));
    } else if ((val - arr[i + 1]) * direction > 0) {
      return false;
    }
  }
  throw 'never';
};
*/
/**
 * Creates an array excluding all provided values using SameValueZero for equality comparisons.
 *
 * @param array The array to filter.
 * @param values The values to exclude.
 * @return Returns the new array of filtered values.
 */
export const without = <T, R extends T = T>(
  array: ArrayLike<T> | null | undefined,
  ...values: T[]
): T[] => {
  if (isEmpty(array)) {
    return [];
  }
  const result: T[] = [];
  for (let i = 0; i < array.length; i++) {
    const val = array[i];
    if (!values.includes(val)) {
      result.push(<T>val);
    }
  }
  return result;
}