Discussion on: [Challenge] Add numbers without (+-*/)

async function makeAdd() {
  /*
   * (module
   *   (func $add (;0;) (export "add") (param $var0 f64) (param $var1 f64) (result f64)
   *     local.get $var0
   *     local.get $var1
   *     f64.add
   *   )
   * )
   */
  const response = await fetch("data:application/octet;base64,AGFzbQEAAAABBwFgAnx8AXwDAgEABwcBA2FkZAAACgkBBwAgACABoAs=")
  const buffer = await response.arrayBuffer()
  const { instance } = await WebAssembly.instantiate(buffer)

  return instance.exports.add
}

;(async function () {
  const add = await makeAdd()

  for (var a = -1; a <= 1; a += 1) {
    for (var b = -1; b <= 1; b += 1) {
      var s = add(a, b)
      var ok = s === a + b

      console[ok ? 'info' : 'warn'](`${ok ? '✅' : '❌'} add(${a}, ${b}) = ${s}`)
    }
  }
}())