sorting servivces

sort.js

const getSortKey = function(el) {
  const pad = function(str, len) { 
    return ('' + str + '                    ').slice(0, len); 
  };
  const addr = [pad(el.streetName || '', 5), pad(el.streetNumber || '', 5), pad(el.unit || '', 5)].join('');
  const name = [pad((el.firstName||'').toLowerCase(), 5), pad((el.lastName||'').toLowerCase(), 5)].join('');
  if (el.product === 'wireless') {
    return [pad('', 15), name, el.ctn, '0-wls'].join('');
  } else if (el.product === 'internet') {
    return [addr, pad('', 20), '1-hsi'].join('');
  } else if (el.product === 'tv') {
    return [addr, pad('', 20), '2-tv '].join('');
  } else if (el.product === 'rhp') {
    return [addr, pad('', 10), el.ctn, '3-rhp'].join('');
  } else {
    return [addr, pad('', 10), el.ctn||'', '4-product'].join('');
  }
};

function sortFn(a, b) {
  const sortKeyA = getSortKey(a);
  const sortKeyB = getSortKey(b);
  return sortKeyA < sortKeyB ? -1 : sortKeyA > sortKeyB ? 1 : 0;
}

const services = [
  {product: 'wireless', firstName: 'array', lastName: 'sort', ctn: '6471234567'},
  {product: 'internet', streetName: 'dixie', streetNumber: '10' },
  {product: 'tv',       streetName: 'dixie', streetNumber: '10'},
  {product: 'internet', streetName: 'dixie', streetNumber: '13', unit: '456'},
  {product: 'rhp',      streetName: 'dixie', streetNumber: '10', ctn: '1234567890'},
  {product: 'wireless', firstName: 'John', lastName: 'Doe', ctn: '1234567890'},
  {product: 'rhp',      streetName: 'dixie', streetNumber: '10', ctn: '4164567890'},
  {product: 'wireless', firstName: 'Foo', lastName: 'Bar', ctn: '4161234567'},
  {product: 'tv',       streetName: 'dixie', streetNumber: '10', unit: '123'},
  {product: 'internet', streetName: 'dixie', streetNumber: '13', unit: '123'},
  {product: 'rhp',      streetName: 'dixie', streetNumber: '10', ctn: '9054567890'},
  {product: 'wireless', firstName: 'Hello', lastName: 'World', ctn: '9053829283'},
];

services.sort(sortFn).forEach(el => console.log(getSortKey(el), JSON.stringify(el)));