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feat(transducers): add dup() & palindrome(), update readme
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,31 @@ | ||
| import { ensureArray } from "@thi.ng/arrays"; | ||
| import { isArray, isString } from "@thi.ng/checks"; | ||
| import { concat } from "./concat"; | ||
|
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| /** | ||
| * Returns the concatentation of `x` with itself. If input is an | ||
| * iterable, it MUST be finite! | ||
| * | ||
| * @remarks | ||
| * Also see the {@link duplicate} transducer for achieving a different | ||
| * kind of value duplication. | ||
| * | ||
| * @example | ||
| * ```ts | ||
| * dup("hello"); // "hellohello" | ||
| * dup([1, 2, 3]); // [1, 2, 3, 1, 2, 3] | ||
| * dup(range(3)); // IterableIterator<number> | ||
| * ``` | ||
| * | ||
| * @param x - | ||
| */ | ||
| export function dup(x: string): string; | ||
| export function dup<T>(x: T[]): T[]; | ||
| export function dup<T>(x: Iterable<T>): Iterable<T>; | ||
| export function dup(x: any): any { | ||
| return isString(x) | ||
| ? x + x | ||
| : isArray(x) | ||
| ? x.concat(x) | ||
| : ((x = ensureArray(x)), concat(x, x)); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,33 @@ | ||
| import { ensureArray } from "@thi.ng/arrays"; | ||
| import { isArray, isString } from "@thi.ng/checks"; | ||
| import { str } from "../rfn/str"; | ||
| import { concat } from "./concat"; | ||
| import { reverse } from "./reverse"; | ||
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|
||
| /** | ||
| * Returns the concatentation of `x` with its own duplicate in reverse | ||
| * order. If input is an iterable, it MUST be finite! | ||
| * | ||
| * @remarks | ||
| * In the general case, this is similar to `concat(x, reverse(x))`, | ||
| * though keeps input type intact. | ||
| * | ||
| * @example | ||
| * ```ts | ||
| * palindrome("hello"); // "helloolleh" | ||
| * palindrome([1, 2, 3]); // [1, 2, 3, 3, 2, 1] | ||
| * palindrome(range(3)); // IterableIterator<number> | ||
| * ``` | ||
| * | ||
| * @param x - | ||
| */ | ||
| export function palindrome(x: string): string; | ||
| export function palindrome<T>(x: T[]): T[]; | ||
| export function palindrome<T>(x: Iterable<T>): Iterable<T>; | ||
| export function palindrome(x: any): any { | ||
| return isString(x) | ||
| ? str("", concat(x, reverse(x))) | ||
| : isArray(x) | ||
| ? x.concat(x.slice().reverse()) | ||
| : ((x = ensureArray(x)), concat(x, reverse(x))); | ||
| } |