Is it normal to figure out some code even after couple of days?

Lets say you saw a code for some JavaScript application or something made for web pages, is it normal to get confused at first time seeing it, in this case as a begginer but one who already knows some basics? It happens to me at times, but i still figure it out even after about 5 days or so. So im wondering if this is normal?

Perfectly normal for beginners and even intermediate level coders.

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I sometimes feel bad about having to rely on specific JS code i find on internet that i wish to use on my websites i make for exercise, but i guess continuous practice will make me rely on checking code every now and then less and less.