How to make auto-completion case sensitive?

Question

spacemacs default configuration enables auto-completion, however by default its case insensitive.

How to make auto-complete case sensitive (specifically using a spacemacs configuration)?

Answer 1

Put this in your ~/.emacs, (setq ac-ignore-case nil).

For spacemacs this can be done by editing ~/.spacemacs file:

(defun dotspacemacs/user-config ()
  ;; add the line below to the user-config section
  (setq ac-ignore-case nil)
  )