title: How to get element from JSON array in array in array
body: <p>I have a question about this JSON. How to get coordinates from here?</p>
  
  <p>I try to use <code>for(){}</code> like code below but doesn't work. </p>
  
  <pre><code>   item {
          "type": "type1",
          "features": [{
                  "type": "typeee1",
                  "geometry": {
                      "type": "Point",
                      "coordinates": [
                          -19.726330999999998,
                          41.360610000000001
                      ]},
                  "properties": {
                      "id_strada": "1433",
                      "nome_strada": "test3",
                  } },
              {
                  "type": "typeee2",
                  "geometry": {
                      "type": "Point",
                      "coordinates": [
                          19.726344999999998,
                          26.36063
                      ] },
                  "properties": {
                     id_strada": "13",
                     "nome_strada": "test5",
                  } },
              {
                  "type": "typeee3",
                  "geometry": {
                      "type": "Point",
                      "coordinates": [
                          19.726358999999999,
                          98.36065
                      ] },
                  "properties": {
                    id_strada": "14",
                      "nome_strada": "test34",
                  } }, {
                  "type": "typeee5",
                  "geometry": {
                      "type": "Point",
                      "coordinates": [
                          19.726372999999999,
                          55.360669999999999
                      ] },
                  "properties": {
                      id_strada": "14335",
                      "nome_strada": "test39",
                  } }],
          "last_update": "15-08-2019 15:04:45"
      }
  </code></pre>
  
  <p>function that call JSON is like below.</p>
  
  <pre><code>item: Item[];
          this.ws.getitems().subscribe(
                  item =&gt; {
                      this.item = item;
                      console.log('this.item.length', this.item.length)
                      for (let i = 0; i &lt; this.item.length; i++) {        
                      }
                  }
              );
  </code></pre>
  
  <blockquote>
    <p>this.item.length is undefined</p>
  </blockquote>
  
  <p>My question is, how to get coordinates in here?</p>
  
  <p>Can you ask me any idea please?
  Thanks!</p>