If only more devs would use short, yet concise, modern constructs instead of archaic ones.

For example in C#: using lambdas, extension methods, LinQ,.. much easier to read through if you know how these work, rather than having to spend all day scanning tedious for-loops and over-engineered classes your colleagues wrote who don't know any better.

Examples:

vs.foreach(v => console.write(v));

initialList = secondList.Where(p => initialList.Contains(p, valueComparer))
.Concat(initialList.Where(p => !secondList.Contains(p, valueComparer))).ToList();