Array

The @perfective/array package provides functions for the standard JS Array class:

• Unit functions:
  • array<T>(...elements: T[]): T[]
  • arrayFromIterable<T>(elements: Iterable<T>): T[]
  • arrayFromArrayLike<T>(elements: ArrayLike<T>): T[]
  • copy<T>(array: T[]): T[] — creates a shallow copy of an array
  • concatenated<T>(initial: T[], ...arrays: T[][]): T[]
  • flatten<T>(arrays: T[][]): T[]
  • intersection<T>(array1: T[], array2: T[]): T[]
  • replicated<T>(value: T, length: number): T[] — creates a new array of the given value replicated the given number of times.
  • replicated<T>(length: number): Unary<T, T[]> — creates a new function that replicates a given value the given number of times.
  • reversed<T>(array: T[]): T[] — creates a shallow reversed copy of an array
  • sorted<T>(array: T[], order?: Compare<T>): T[] — creates a shallow sorted copy of an array
  • unique<T>(array: T[]): T[] — creates a shallow copy with all duplicate elements removed
  • wrapped<T>(value: T | T[]): T[] — if value is an array, returns the original array; otherwise returns an array with that value.
• Type guards:
  • isArray<T, V = unknown>(value: T[] | V): value is T[]
  • isNotArray<T, V = unknown>(value: T[] | V): value is V
• Predicates:
  • isEmpty<T>(value: T[]): boolean
  • isNotEmpty<T>(value: T[]): boolean
  • includes<T>(search: T, from?: number): Predicate<T[]>
  • includedIn<T>(array: T[], from?: number): Predicate<T>
  • every<T>(condition: Predicate<T>): Predicate<T[]>
  • some<T>(condition: Predicate<T>): Predicate<T[]>
• Iterators:
  • entries<T>(array: T[]): IterableIterator<[number, T]>
  • keys<T>(array: T[]): IterableIterator<number>
  • values<T>(array: T[]): IterableIterator<T>
• Map/Reduce:
  • map<T, V>(lift: Unary<T, V>): Unary<T[], V[]>
  • reduce<T, V>(reducer: Reducer<T, V>, initial: V): Unary<T[], V>
  • reduceTo<T>(reducer: Reducer<T, T>): Unary<T[], T>
  • reduceRight<T, V>(reducer: Reducer<T, V>, initial: V): Unary<T[], V>
  • reduceRightTo<T>(reducer: Reducer<T, T>): Unary<T[], T>
  • join<T>(separator: string = ','): Unary<T[], string>
• Immutable element operators:
  • head<T>(array: T[]): T | undefined — returns the first (head) element of an array;
  • tail<T>(array: T[]): T[] — returns an array without the first element;
  • end<T>(array: T[]): T | undefined — returns the last (end) element of an array;
  • init<T>(array: T[]): T[] — returns an array without the last element;
  • element<T>(index: number): Unary<T[], T | undefined> — returns the element by its index;
  • find<T>(condition: Predicate<T>): Unary<T[], T | undefined>
• Mutable element operators:
  • pop<T>(array: T[]): T | undefined
  • push<T>(...items: T[]): Unary<T[], number>
  • shift<T>(array: T[]): T | undefined
  • unshift<T>(...items: T[]): Unary<T[], number>
• Index operators:
  • findIndex<T>(condition: Predicate<T>): Unary<T[], number | -1>
  • indexOf<T>(search: T, from?: number): Unary<T[], number | -1>
  • lastIndexOf<T>(search: T, from?: number): Unary<T[], number | -1>
• Immutable array operators:
  • first<T>(count: number = 1): Unary<T[], T[]> — returns an array of the first count of elements.
  • last<T>(count: number = 1): Unary<T[], T[]> — returns an array of the last count of elements.
  • append<T>(element: T): Unary<T[], T[]> — returns an array with an element inserted in the end of the original array.
  • prepend<T>(element: T): Unary<T[], T[]> — returns an array with an element inserted in the beginning of the original array.
  • insert<T>(index: number, element: T): Unary<T[], T[]> — returns an array with an element inserted into the given index.
  • insertInto<T>(array: T[], index: number): Unary<T, T[]> — returns an array with an element inserted into the given array.
  • replace<T>(index: number, element: T): Unary<T[], T[]> — returns an array with an element replaced in the given index.
  • remove<T>(index: number): Unary<T[], T[]> — returns an array with an element removed from the given index.
  • concat<T>(...items: ConcatArray<T>[]): Unary<T[], T[]>
  • filter<T>(condition: Predicate<T>): Unary<T[], T[]>
  • slice<T>(start?: number, end?: number): Unary<T[], T[]>
  • sorted<T>(order?: Compare<T>): Unary<T[], T[]>
• Mutable (in-place) array operators:
  • copyWithin<T>(target: number, start: number = 0, end?: number): Unary<T[], T[]>
  • fill<T>(value: T, start?: number, end?: number): Unary<T[], T[]>
  • reverse<T>(array: T[]): T[]
  • sort<T>(order?: Compare<T>): Unary<T[], T[]>
  • splice<T>(start: number, deleteCount?: number): Unary<T[], T[]>
  • spliceWith<T>(start: number, deleteCount: number, ...items: T[]): Unary<T[], T[]>
• Procedures:
  • forEach<T>(procedure: Unary<T, void>): Unary<T[], void>
• Filters:
  • Filter<T, S extends T>
  • by<T, K extends keyof T>(property: K, condition: Predicate<T[K]>): Filter<T, T> — filters an array keeping elements with the property that satisfies the condition.
  • isFirstOccurrence<T>(value: T, index: number, array: T[]): boolean
  • isLastOccurrence<T>(value: T, index: number, array: T[]): boolean
• Mappers:
  • Map<T, U>
• Reducers:
  • Reduce<T, V>

Read the full documentation in the repository.