Map.update inside for loop

[stefanchrobot]

@kalindkaria

use Bitwise
sensor_data = %{sensor1: 0}
for n <- 0..9, do: sensor_data = Map.update!(sensor_data, :sensor1, &(&1 ||| (1 <<< n)))

The “assignment” inside the for loop has no effect, it creates a new variable on each loop iteration. I think you might be looking for Enum.reduce:

Enum.reduce(0..9, %{sensor1: 0}, fn n, sensor_data ->
  Map.update!(sensor_data, :sensor1, &(&1 ||| (1 <<< n)))
end)