Wordmachine

wordmachine.js

const wordMachine = (commands) => {
  const operations = commands.split(' ');
  let stack = [];
  commandCount = 0;

  operations.map((item, index) => {
    let detectInteger = parseInt(item);
    commandCount++;

    //console.log(stack);

    if (Number.isInteger(detectInteger)) {
      stack.push(detectInteger);
    } else {
      switch (item) {
        case 'DUP':
          //console.log(`Duplicated ${stack[stack.length - 1]}`);
          return stack.push(stack[stack.length - 1]);
        case 'POP':
          //console.log(`Popped ${stack[stack.length - 1]}`);
          return stack.pop();
        case '+':
          let addedIntegers = stack[stack.length - 1] + stack[stack.length - 2];
          stack.pop();
          stack.pop();
          return stack.push(addedIntegers);
        case '-':
          let subtractedIntegers = stack[stack.length - 1] - stack[stack.length - 2];
          stack.pop();
          stack.pop();
          return stack.push(subtractedIntegers);
      }
    }

  });

  console.log(commandCount);
  
  if(isNaN(stack[stack.length - 1]) === true) {
  	return -1;
  } else {
	  return stack[stack.length - 1];
  }
}


console.clear();
//const test = wordMachine('13 DUP 4 POP 5 DUP + DUP + -');
const test = wordMachine('5 6 + -');
console.log(test);