js.sh

#!/usr/bin/env bash
set -eu

main() {
  Object.new |
    Object.set name "$(echo Brian Mock | String.new)" |
    Object.get name

  Array.new |
    Array.push 1 |
    Array.push 2 |
    Array.push "$(Math.multiply 3 4)" |
    Array.get 2
}

Array.new() {
  echo "[]"
}

Array.push() {
  env \
    arr="$(cat)" \
    val="$1" \
    node -pe "
      var arr = JSON.parse(process.env.arr);
      var val = JSON.parse(process.env.val);
      arr.push(val);
      JSON.stringify(arr);
    "
}

Array.get() {
  env \
    arr="$(cat)" \
    idx="$1" \
    node -pe "
      var arr = JSON.parse(process.env.arr);
      var idx = JSON.parse(process.env.idx);
      JSON.stringify(arr[idx]);
    "
}

Object.new() {
  echo "{}"
}

Object.set() {
  env \
    obj="$(cat)" \
    key="$1" \
    val="$2" \
    node -pe "
      var obj = JSON.parse(process.env.obj);
      var key = process.env.key;
      var val = JSON.parse(process.env.val);
      obj[key] = val;
      JSON.stringify(obj);
    "
}

Object.get() {
  env \
    obj="$(cat)" \
    key="$1" \
    node -pe "
      var obj = JSON.parse(process.env.obj);
      var key = process.env.key;
      JSON.stringify(obj[key]);
    "
}

String.new() {
  env \
    str="$(cat)" \
    node -pe "
      var str = process.env.str;
      JSON.stringify(str);
    "
}

Number.new() {
  env \
    num="$(cat)" \
    node -pe "
      var num = +process.env.num;
      JSON.stringify(num);
    "
}

Math.multiply() {
  env \
    a="$1" \
    b="$2" \
    node -pe "
      var a = +process.env.a;
      var b = +process.env.b;
      JSON.stringify(a * b)
    "
}

main