A small and simple Brainfck compiler function in javascript

BrainfckCompiler.js

const compile = (input) => {
  const tape = new Array(10).fill(0);
  let pointer = 0;
  let isLooping = false;
  let loopStack = [];
  let innerLoops = 0;
  let output = "";

  for (let i = 0; i < input.length; i++) {
    const c = input[i];

    if (isLooping) {
      if (c === "[") innerLoops++;
      if (c === "]") {
        if (innerLoops === 0) isLooping = false;
        else innerLoops--;
      }
      continue;
    }

    switch (c) {
      case "+":
        tape[pointer]++;
        break;
      case "-":
        tape[pointer]--;
        break;
      case ",":
        tape[pointer] = prompt()[0].charCodeAt();
        break;
      case ".":
        output += String.fromCharCode(tape[pointer]);
        break;
      case "<":
        pointer--;
        tape[pointer] = tape[pointer] || 0;
        break;
      case ">":
        pointer++;
        tape[pointer] = tape[pointer] || 0;
        break;
      case "[":
        tape[pointer] === 0 ? (isLooping = true) : loopStack.push(i);
        break;
      case "]":
        tape[pointer] !== 0
          ? (i = loopStack[loopStack.length - 1])
          : loopStack.pop();
        break;
    }
  }
  console.log(output);
};