useful-functions.js

function isIntAnyway(x) {
  if (Number(x) && x % 1 === 0)
    return true;
  return false;
}

// Checks if value is in array
function inArray(value, array) {
  return array.indexOf(value) > -1;
}

function formatFileSize(size) {
  var formatedValue, formatedUnit;
  
  if (size > 999999999) {
    formatedValue = (size/1000000000).toFixed(1);
    formatedUnit = 'GB';
  }
  else if (size > 999999) {
    formatedValue = (size/1000000).toFixed(1);
    formatedUnit = 'MB';
  }
  else if (size > 999) {
    formatedValue = (size/1000).toFixed(0);
    formatedUnit = 'kB';
  }
  else {
    formatedValue = size;
    formatedUnit = 'B';
  }
  
  return {
    value: formatedValue,
    unit: formatedUnit
  };
}