smart-js-ts-snippets

unpacking.js

import assert from "assert";

var easyUnpack = (values: any[]): any[] => [
  values[0],
  values[2],
  values[values.length - 2],
];

console.log("Example:");
console.log(easyUnpack([1, 2, 3, 4, 5, 6, 7, 9]));
assert.deepEqual(easyUnpack([1, 2, 3, 4, 5, 6, 7, 9]), [1, 3, 7]);
assert.deepEqual(easyUnpack([1, 1, 1, 1]), [1, 1, 1]);
assert.deepEqual(easyUnpack([6, 3, 7]), [6, 7, 3]);
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/**
 * This is my real solution, but if I submit it as an arrow function it is not working
 * So, I added the function as a regular one just so it calls my realSolution
 **/
const realSolution = ({
  0: a,
  2: b,
  length,
  [length - 2]: c,
}: any[]): any[] => [a, b, c];

/** I think most people are going to do something like this: */
const commonEasyUnpack = (e) => [e[0], e[2], e[e.length - 2]];

/** Here is a way for not having to do e.length - 2 */
const IdontWantToDoMathEasyUnpack = (e, [f, , t] = e) => [f, t, e.reverse()[1]];

function easyUnpack(values: any[]): any[] {
  return realSolution(values);
}