hasOwnProperty() is only checking if a certain property exists in a JSON, but doesn't return anything if it doesn't

TahirChutiya — Tue, 26 Apr 2022 08:14:49 GMT

I keep trying different methods to check if this JSON contains "attributes." In this way I can determine if the given coordinates are outside of wetlands. If they are in wetlands, "attributes" will exist in the JSON. If they aren't in wetlands, 'attributes' won't be in the JSON.

When I run this function, I am only getting TRUE - when I type in coordinates that are in a wetland (try 43.088 instead, in the JSON url, which returns true).

However I want FALSE for the given url. For some reason when I do console.log("FALSE"), this doesn't appear or return in the console at all if hasOwnProperty('attributes') == false.

Am I missing something?

Re: hasOwnProperty() is only checking if a certain property exists in a JSON, but doesn't return anything if it doesn't

RobertScheitlin__GISP — Wed, 20 Apr 2022 12:25:55 GMT

@TahirChutiya

Try this

function appendData3(data) { data.features.map(obj=>{ if (obj.hasOwnProperty('attributes')) { console.log("TRUE"); } else { console.log("FALSE"); } }) }

topic hasOwnProperty() is only checking if a certain property exists in a JSON, but doesn't return anything if it doesn't in ArcGIS JavaScript Maps SDK Questions

hasOwnProperty() is only checking if a certain property exists in a JSON, but doesn't return anything if it doesn't

Re: hasOwnProperty() is only checking if a certain property exists in a JSON, but doesn't return anything if it doesn't