@thi.ng/transducers/dup.js

Collection of ~170 lightweight, composable transducers, reducers, generators, iterators for functional data transformations

import { ensureArray } from "@thi.ng/arrays/ensure-array";
import { isArray } from "@thi.ng/checks/is-array";
import { isString } from "@thi.ng/checks/is-string";
import { concat } from "./concat.js";
function dup(x) {
  return isString(x) ? x + x : isArray(x) ? x.concat(x) : (x = ensureArray(x), concat(x, x));
}
export {
  dup
};