How to concatenate two vectors in Julia?

Question

Given two vectors a = [1, 2] and b = [3, 4], how do I obtain the concatenated vector c = [1, 2, 3, 4]? It seems that hcat or vcat could be used as they work on arrays, but when using vectors to store collections of elements it seems unfitting to first think about the orientation of the data; it's just supposed to be a list of values.

Answer 1

You can write

[a; b]

Under the hood this is the same as vcat, but it's terser, looks better, and is easier to remember, as it's also consistent with literal matrix construction syntax.

An alternative for concatenating multiple vectors is

reduce(vcat, (a, b))