The Enigma Machine - Part 1: The Plugboard

The Enigma Machine - Part 1: The PlugboardCodewars

Approach

Solve the problem

1. constructor validation

   1. unique character size must same with input length

   2. input length should be even

   3. wire length should less than 20

2. if wire index is exist

   1. if index odds return wires[index + 1]

   2. if index even return wires[index - 1]

3. if the wire doesn't exist just return input

Solution

JavaScript

class Plugboard {
  
  constructor(wires = '') {
    console.log(wires);
    if (new Set([...wires]).size !== wires.length
      || wires.length % 2 === 1
      || wires.length > 20) {
      throw '';
    }
    this.wires = wires;
  }
  
  process(wire) {
    const index = this.wires.indexOf(wire);
    if (index % 2 === 0) {
      return this.wires[index + 1];
    }
    if (index % 2 === 1) {
      return this.wires[index - 1];
    }
    return wire;
  }
};