I do an InfluxDB query and get exact one result row like this:
{"result":[[{"result":"_result","table":0,"_start":"2022-01-28T09:00:12.676771291Z","_stop":"2022-01-29T09:00:12.676771291Z","_measurement":"Strom.Heizung.Energie_in_der_letzten_Stunde","_value":14.683000000000117,"_time":"2022-01-29T09:00:12.676771291Z","ts":1643446812676}]],"ts":1643446812684,"error":null}
I need the value of the _value key in a variable e.g. value. In this example the 14.683000000000117
I tried it with the map-function:
value = query.result[0].map(elm => (elm._value));
but I get the value in brackets like [14.683000000000117]
How can I get the number in my value variable?
Thanks
Frank
map() returns an array, even if it's an array of length 1. So, you want to retrieve the first element of the array it returns. You can achieve that by appending [0] at the end:
value = query.result[0].map(elm => (elm._value))[0];
Learn more on accessing array elements here, in the "Accessing Array Elements" section: https://www.w3schools.com/js/js_arrays.asp