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| function! s:fold(list, init, pred) abort | |
| let acc = a:init | |
| for item in a:list | |
| let acc = a:pred(acc, item) | |
| endfor | |
| return acc | |
| endfunction | |
| echo s:fold([1, 2, 3, 4, 5], 0, {acc, i -> acc + i}) |
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