The most fancy way to write 2D array

Question

I have something like

What's the best way to do it? I tried this method but it doesn't work.

\begin{array}{r}[[0.86455156], \\ [-0.82104237], \\ [4.12186079]]\end{array}

Getting,

Answer 1

Something like this?

This solution works in both text mode and math mode.

\documentclass{article} % or some other suitable document class
\usepackage{array}
\begin{document}
\begin{tabular}{@{} >{\ttfamily}r @{}}
  [[ 0.86455156], \\ \relax
   [-0.82104237], \\ \relax
   [ 4.12186079]]
\end{tabular}
\end{document}