simpleCalc/calc.js

//----init----
//define shit
let total = 0;
let display = 0;
let last = 'init';
let store = 0;
let crumbs = [];

//on numIn
//write string to display
function updateDisplay(wit){
  document.getElementById('display').innerText = parseFloat(wit);
}

function numIn(x) {
  display = '' + display + x;
  updateDisplay(display);
}

function del(){
  display = 0;
  updateDisplay(total);
}
function makeCrumbs(bread){
  let crumb = 'nope';
  switch (bread) {
    case 'div':
      crumb = '/';
      break;
    case 'mul':
      crumb = '*';
      break;
    case 'sub':
      crumb = '-';
      break;
    case 'add':
      crumb = '+';
      break;
    case 'tot':
      crumb = '=';
      break;
    case 'exp':
      crumb = '^';
  }
  crumbs.push(parseFloat(display));
  crumbs.push(crumb);
  document.getElementById('breadcrumbs').innerText = crumbs.join(' ');
}
//on oprIn
function calcOp(opr) {
//convert display string to float
  let input = parseFloat(display);
//update breadcrumbs
  makeCrumbs(opr);
//copy display to store
  store = parseFloat(display);
//if init copy display to total and update last
  if (last == 'init'){
    total = parseFloat(display);
  }
//do math
  switch(last){
    case 'div':
      total = total / parseInt(display);
      break;
    case 'mul':
      total = total * parseInt(display);
      break;
    case 'sub':
      total = total - parseInt(display);
      break;
    case 'add':
      total = total + parseInt(display);
      break;
    case 'exp':
      total = total ** parseInt(display);
      break;
  }

//clear display and show total, set last
  del();
  last = opr;
//logs
  console.log(store);
  console.log(total);
  console.log(last);
  console.log(typeof store);
  console.log(typeof total);
}