How to build a geocoding app

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https://geocode.arcgis.com/arcgis/rest/services/World/GeocodeServer/<request>?<parameters>&f=json&token=<ACCESS_TOKEN>

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          geocodingServiceUrl = "https://geocode-api.arcgis.com/arcgis/rest/services/World/GeocodeServer";

          const params = {
            text: "New Y", // Suggestion text
          };

          locator.suggestLocations(geocodingServiceUrl, params).then((response) => {
            // Show a list of the suggestions
            response.forEach((suggestion) => {
              showSuggestion(suggestion.text, suggestion.magicKey);
            });
            // When a suggestion is selected, geocode to find its location
            select.addEventListener("calciteSelectChange", (event) => {
              const text = event.target.innerHTML;
              const magicKey = event.target.value;
              geocodeSuggestion(text, magicKey);
            });
          });

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        const geocodingServiceUrl = "https://geocode-api.arcgis.com/arcgis/rest/services/World/GeocodeServer" ;

        const params = {
          location: pt
        };

        locator.locationToAddress(geocodingServiceUrl, params).then(
          (response) => {
            if (response) {
              showPopup(response);
            }
          },
          (err) => {
            showPopup("No address found.", pt);
          }
        );

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      function findPlaces(pt) {
        const geocodingServiceUrl = "http://geocode-api.arcgis.com/arcgis/rest/services/World/GeocodeServer";

        const params = {
          categories: ["gas station"],
          location: pt,  // Paris (2.34602,48.85880)
          outFields: ["PlaceName","Place_addr"]
        }

        locator.addressToLocations(geocodingServiceUrl, params).then((results)=> {
          showResults(results);
        });

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          const geocodingServiceUrl =
            "http://geocode.arcgis.com/arcgis/rest/services/World/GeocodeServer"

          const params = {
            addresses: [
              {
                objectid: 1,
                address: "Buckingham Palace",
              },
              {
                objectid: 2,
                address: "Abeno Restaurant London",
              },
              {
                objectid: 3,
                address: "58 Brewer Street, London, England",
              },
            ],
          }

          locator.addressesToLocations(geocodingServiceUrl, params).then(
            results => {
              if (results.length) {
                results.forEach(result => {
                  addGraphic(result)
                })
              }
            },
            function(error) {
              console.log(error)
            }
          )