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Comment by phaedrix | Hacker News Reader

I use space for toggling folding:

  " space toggles the fold state under the cursor.
  nnoremap <silent><space> :exe 'normal! za'.(foldlevel('.')?'':'l')<cr>
  " <leader>space expands with zO
  map <leader><space> zO

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same here, but use

   nnoremap <Space> za   
   vnoremap <Space> za

also, for folding in general I'd recommend using

  set foldmethod=marker

which has the benefit of making folds more 'transparent' in your code, and also persistent across vim sessions

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