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object-keys

Syntax​

- object-keys

Description​

The object-keys operation takes an object value and emits an array of its keys. If the incoming value is an array, the operation emits an array of its numeric indexes ([0, 1, 2, ...]). For any other value type (numbers, strings, null), the value is passed through unchanged.

This operation is most useful for extracting the list of property names from a structured value, so that the names can be further processed by operations like map or reject.

Examples​

  var1:
    - source: sensor-readings
    - object-keys
info

In the above example, sensor-readings is an identifier from another part of the adapter script that produces an object like { temp: 72.4, pressure: 101.3, humidity: 45 }. The variable var1 will emit ['temp', 'pressure', 'humidity'].