How to make a wavy line animation?

Question

css

Hello colleagues.
There is such SVG-shka. Please tell me how can I make the draw animation of this SVG.

Answer 1

Perpetual motion on the horizon, with a return to the place https://jsfiddle.net/q74e191z/
UPD: This is smoother https://jsfiddle.net/q74e191z/1/

Answer 2

draw it with a dotted line with a very long stroke, and change the offset of this stroke.
Example

Answer 3

https://jsfiddle.net/lenskyuser/q2gokfa1/8/ probably like this