What's the fastest/simplest way to create sea waves along a path in illustrator?

Question

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I am looking for the best way to replicate something like the bottom left sea image (or top left img) in the picture above using illustrator.

I would do it by grouping a bunch of circles together but there's gotta be an easier way to do this

Why would a method that requires 1 minute of preparation be better than hitting ctrl+d for a half minute? — joojaa, Jun 9 '18 at 18:21
Maybe the wave line is just an example for the question. Remember the answers are not only for this OP, but for any other user. To create a specific waves line Cmd + D is enough. To frame a DIN A3 with quadruple wave lines, the one-minute tutorial will be more useful. — user120647, Jun 9 '18 at 19:22
@Danielillo No, its no more or less work, just different. Its is best to learn that shortcuts are things that find you, looking for a shortcut for everything makes one unable to execute. There is a balance between the two. But i can do this quicker and simpler, but the level of abstraction is too great. — joojaa, Jun 9 '18 at 19:38

user120647user120647 · Accepted Answer · 2018-06-09 17:49:40Z

You can make a Pattern Brush with a semicircle and apply it to a line
Fill = None / Stroke = Black
On the Pattern Brush Window Options choose Method > Tints, to enable the color change of the brush stroke

Make a Pattern Brush with a square cropped by a semicircle on the top for the second option
Fill = Black / Stroke = none
Brush Method > Tints
Duplicate the line and change the stroke color

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