Generates a truth table out of arbritrary array elements

output.json

[
  ["1", "A", "X"],
  ["1", "A", "Y"],
  ["1", "B", "X"],
  ["1", "B", "Y"],
  ["2", "A", "X"],
  ["2", "A", "Y"],
  ["2", "B", "X"],
  ["2", "B", "Y"]
]

truth-table.ts

class Sequence {
  private currentIndex = 0;
  constructor(private readonly elements: string[]) {}

  public get isFinished() {
    return this.currentIndex === this.elements.length
  }

  public getNext() {
    return this.elements[this.currentIndex++]
  }

  public reset() {
    this.currentIndex = 0
  }
}

const getTruthTable = (sequences: Sequence[], base: string[] = []): string[][] => {
  if (!sequences.length) {
    return [base]
  }

  const results: string[][] = []
  while(!sequences[0].isFinished) {
    const combinations = getTruthTable(sequences.slice(1), [...base, sequences[0].getNext()])
    Array.prototype.push.apply(results, combinations)    
  }

  sequences[0].reset()
  return results
}

const truthTable = getTruthTable([
  new Sequence(['1', '2']),
  new Sequence(['A', 'B']),
  new Sequence(['X', 'Y']),
])

console.log(JSON.stringify(truthTable, null, 2))