TypeError: Assignment to constant variable, when trying to create an array of objects

February 15, 2021 by admin

I’ve been working on a scraper and all was good until I’ve tried to push objects of scraped data into an array.

Right now I have this:

exports.parseData = (getLink, getDescription, getPrice, getPicture) => {
  const apartments = [];
  apartments = {
    link: getLink,
    descr: getDescription,
    price: getPrice,
    picture: getPicture,
  };
  console.log(apartments);
};

But it throws an error: TypeError: Assignment to constant variable.

Now I think this is happening because of how data is sent to a parser.
Here is how data looks when I use this code:

exports.parseData = (getLink, getDescription, getPrice, getPicture) => {
  console.log(getLink);
  console.log(getDescription);
  console.log(getPrice);
  console.log(getPicture);
  console.log('-----------------');
};


https://www.sant.ba/nekretnine/nekretnina-3467-dvosoban-stan-sa-liftom-u-samom-centru-grada-63-m2
 dvosoban stan sa liftom u samom centru grada , 63 m2 
199000.00
https://www.sant.ba/thumb.php?file=photos/3467/3467_1_1563271355.jpg&maxw=273&maxh=205
-----------------
https://www.sant.ba/nekretnine/nekretnina-3689-troiposoban-stan-u-naselju-sunca
 Troiposoban stan u naselju Sunca
360000.00
https://www.sant.ba/thumb.php?file=photos/3689/3689_1_1612344465.jpg&maxw=273&maxh=205
-----------------
https://www.sant.ba/nekretnine/nekretnina-3677-trosoban-renoviran-stan-u-naselju-dolac-malta-73-m2
 trosoban, renoviran stan u naselju Dolac malta, 73 m2
150000.00
https://www.sant.ba/thumb.php?file=photos/3677/3677_1_1608550332.jpg&maxw=273&maxh=205
-----------------
https://www.sant.ba/nekretnine/nekretnina-3537-cetverosoban-stan-u-novogradnji-sa-prelijepim-pogledom-na-grad-118-38-m2
 Četverosoban stan u novogradnji sa prelijepim pogledom na grad, 118,38 m2 
538090.37
https://www.sant.ba/thumb.php?file=photos/3537/3537_1_1573217155.jpg&maxw=273&maxh=205
-----------------
https://www.sant.ba/nekretnine/nekretnina-3536-trosoban-stan-u-novogradnji-sa-prelijepim-pogledom-na-grad-105-34-m2
 Trosoban stan u novogradnji sa prelijepim pogledom na grad, 105,34 m2
478817.70
https://www.sant.ba/thumb.php?file=photos/3536/3536_2_1573216638.jpg&maxw=273&maxh=205
-----------------
https://www.sant.ba/nekretnine/nekretnina-3535-luksuzni-cetverosoban-stan-na-cobaniji-117-43m2
 Luksuzni četverosoban stan na Čobaniji,117,43m2
533772.19
https://www.sant.ba/thumb.php?file=photos/3535/3535_13_1573215220.jpg&maxw=273&maxh=205
-----------------
https://www.sant.ba/nekretnine/nekretnina-3534-trosoban-stan-u-novogradnji-90-m2
 trosoban stan u novogradnji, 90 m2
376923.46
https://www.sant.ba/thumb.php?file=photos/3534/3534_8_1573214216.jpg&maxw=273&maxh=205
-----------------
etc....

Now what my desired output would be: To have an array of objects, where objects are filled with data like it’s shown in example above. So for each getLink, getDescription, getPrice, getPicture create new object and push it into an array(like I’m using it in the first code block).

Output that I would like to get is:

[
   {
   
      link: https://www.sant.ba/nekretnine/nekretnina-3467-dvosoban-stan-sa-liftom-u-samom-centru-grada-63-m2
      descr: dvosoban stan sa liftom u samom centru grada , 63 m2 
      price: 199000.00
       picture: https://www.sant.ba/thumb.php?file=photos/3467/3467_1_1563271355.jpg&maxw=273&maxh=205
   },
   {
     link:https://www.sant.ba/nekretnine/nekretnina-3689-troiposoban-stan-u-naselju-sunca
     descr: Troiposoban stan u naselju Sunca
     price: 360000.00
     picture: https://www.sant.ba/thumb.php?file=photos/3689/3689_1_1612344465.jpg&maxw=273&maxh=205
   },
   etc...
]

Is something like this easy to achieve?
Thanks!

Here is from where these variables are sent:

const cheerio = require('cheerio');
const axios = require('axios');
const parsing = require('./parseData');

exports.olxScraper = () => {
  const url =
    'https://www.olx.ba/pretraga?vrsta=samoprodaja&kategorija=23&sort_order=desc&kanton=9&sacijenom=sacijenom&stranica=1';

  const getRawData = async () => {
    try {
      await axios.get(url).then((res) => {
        const $ = cheerio.load(res.data);
        $('div[id="rezultatipretrage"] > div')
          .not('div[class="listitem artikal obicniArtikal  i index"]')
          .not('div[class="obicniArtikal"]')
          .each((index, element) => {
            $('span[class="prekrizenacijena"]').remove();
            const getLink = $(element)
              .find('div[class="naslov"] > a')
              .attr('href');
            const getDescription = $(element)
              .find('div[class="naslov"] > a > p')
              .text();
            const getPrice = $(element)
              .find('div[class="datum"] > span')
              .text()
              .replace(/\.| ?KM$/g, '')
              .replace(' ', '');
            const getPicture = $(element)
              .find('div[class="slika"] > img')
              .attr('src');

            parsing.parseData(getLink, getDescription, getPrice, getPicture);
          });
      });
    } catch (error) {
      console.log(error);
    }
  };
  getRawData();
};

exports.santScraper = () => {
  const url = `https://www.sant.ba/pretraga/prodaja-1/tip-2/cijena_min-20000/stranica-1`;

  const getRawData = async () => {
    try {
      await axios.get(url).then((response) => {
        const $ = cheerio.load(response.data);

        $('div[class="col-xxs-12 col-xss-6 col-xs-6 col-sm-6 col-lg-4"]').each(
          (index, element) => {
            const getLink = $(element).find('a[class="re-image"]').attr('href');
            const getDescription = $(element).find('a[class="title"]').text();
            const getPrice = $(element)
              .find('div[class="prices"] > h3[class="price"]')
              .text()
              .replace(/\.| ?KM$/g, '')
              .replace(',', '.');
            const getPicture = $(element).find('img').attr('data-original');
            /*const getSquaremeters = $(element)
        .find('span[class="infoCount"]')
        .first()
        .text()
        .replace(',', '.')
        .split('m')[0];

      const pricepersquaremeter =
        parseFloat(getPrice) / parseFloat(getSquaremeters);
      articles[index] = {
        id: getLink.substring(42, 46),
        link: getLink,
        descr: getDescription,
        price: Math.round(getPrice),
        pictures: getPicture,
        sqm: Math.round(getSquaremeters),
        ppm2: Math.round(pricepersquaremeter),
      };*/
            parsing.parseData(getLink, getDescription, getPrice, getPicture);
          }
        );
      });
    } catch (error) {
      console.log(console.log(error));
    }
  };
  getRawData();
};

this.olxScraper();
this.santScraper();