JavaScript: Grab a single numerical value from a key-value array and save it to a variable

After executing an InfluxDB query, I receive a single result row in the following format:

{"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'm looking to extract and store the value of the _value key into a variable, for example, value. In this instance, the value is 14.683000000000117.

I attempted to achieve this using the map function:

value = query.result[0].map(elm => (elm._value));

However, the value is returned within brackets like [14.683000000000117]. How can I obtain just the number in my value variable?

Thank you,

Frank

javascriptarraysvariables

Answer №1

When using the <code>map() function, keep in mind that it always returns an array, even if it only contains one element. To get the first element of this returned array, simply add [0] at the end:

To extract the desired value from the result array, you can use the following code snippet: <code>value = query.result[0].map(elm => (elm._value))[0];

If you want to learn more about accessing elements in arrays, check out the "Accessing Array Elements" section on this link:

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