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# Instructions | ||
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Take a nested list and return a single flattened list with all values except nil/null. | ||
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The challenge is to write a function that accepts an arbitrarily-deep nested list-like structure and returns a flattened structure without any nil/null values. | ||
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For example: | ||
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input: [1,[2,3,null,4],[null],5] | ||
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output: [1,2,3,4,5] |
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{ | ||
"authors": [ | ||
"BNAndras" | ||
], | ||
"files": { | ||
"solution": [ | ||
"flatten_array.vim" | ||
], | ||
"test": [ | ||
"flatten_array.vader" | ||
], | ||
"example": [ | ||
".meta/example.vim" | ||
] | ||
}, | ||
"blurb": "Take a nested list and return a single list with all values except nil/null.", | ||
"source": "Interview Question", | ||
"source_url": "https://reference.wolfram.com/language/ref/Flatten.html" | ||
} |
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function! Flatten(array) abort | ||
let l:results = [] | ||
for l:elem in a:array | ||
if type(l:elem) == v:t_list | ||
call extend(l:results, Flatten(l:elem)) | ||
elseif l:elem isnot v:null | ||
call add(l:results, l:elem) | ||
endif | ||
endfor | ||
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return results | ||
endfunction |
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# This is an auto-generated file. | ||
# | ||
# Regenerating this file via `configlet sync` will: | ||
# - Recreate every `description` key/value pair | ||
# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications | ||
# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion) | ||
# - Preserve any other key/value pair | ||
# | ||
# As user-added comments (using the # character) will be removed when this file | ||
# is regenerated, comments can be added via a `comment` key. | ||
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[8c71dabd-da60-422d-a290-4a571471fb14] | ||
description = "empty" | ||
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[d268b919-963c-442d-9f07-82b93f1b518c] | ||
description = "no nesting" | ||
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[3f15bede-c856-479e-bb71-1684b20c6a30] | ||
description = "flattens a nested array" | ||
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[c84440cc-bb3a-48a6-862c-94cf23f2815d] | ||
description = "flattens array with just integers present" | ||
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[d3d99d39-6be5-44f5-a31d-6037d92ba34f] | ||
description = "5 level nesting" | ||
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[d572bdba-c127-43ed-bdcd-6222ac83d9f7] | ||
description = "6 level nesting" | ||
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[0705a8e5-dc86-4cec-8909-150c5e54fa9c] | ||
description = "null values are omitted from the final result" | ||
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[c6cf26de-8ccd-4410-84bd-b9efd88fd2bc] | ||
description = "consecutive null values at the front of the list are omitted from the final result" | ||
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[382c5242-587e-4577-b8ce-a5fb51e385a1] | ||
description = "consecutive null values in the middle of the list are omitted from the final result" | ||
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[ef1d4790-1b1e-4939-a179-51ace0829dbd] | ||
description = "6 level nest list with null values" | ||
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[85721643-705a-4150-93ab-7ae398e2942d] | ||
description = "all values in nested list are null" |
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Execute (empty): | ||
let g:array = [] | ||
let g:expected = [] | ||
AssertEqual g:expected, Flatten(g:array) | ||
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Execute (no nesting): | ||
let g:array = [0, 1, 2] | ||
let g:expected = [0, 1, 2] | ||
AssertEqual g:expected, Flatten(g:array) | ||
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Execute (flattens a nested array): | ||
let g:array = [[[]]] | ||
let g:expected = [] | ||
AssertEqual g:expected, Flatten(g:array) | ||
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Execute (flattens array with just integers present): | ||
let g:array = [1, [2, 3, 4, 5, 6, 7], 8] | ||
let g:expected = [1, 2, 3, 4, 5, 6, 7, 8] | ||
AssertEqual g:expected, Flatten(g:array) | ||
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Execute (5 level nesting): | ||
let g:array = [0, 2, [[2, 3], 8, 100, 4, [[[50]]]], -2] | ||
let g:expected = [0, 2, 2, 3, 8, 100, 4, 50, -2] | ||
AssertEqual g:expected, Flatten(g:array) | ||
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Execute (6 level nesting): | ||
let g:array = [1, [2, [[3]], [4, [[5]]], 6, 7], 8] | ||
let g:expected = [1, 2, 3, 4, 5, 6, 7, 8] | ||
AssertEqual g:expected, Flatten(g:array) | ||
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Execute (null values are omitted from the final result): | ||
let g:array = [1, 2, v:null] | ||
let g:expected = [1, 2] | ||
AssertEqual g:expected, Flatten(g:array) | ||
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Execute (consecutive null values at the front of the list are omitted from the final result): | ||
let g:array = [v:null, v:null, 3] | ||
let g:expected = [3] | ||
AssertEqual g:expected, Flatten(g:array) | ||
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Execute (consecutive null values in the middle of the list are omitted from the final result): | ||
let g:array = [1, v:null, v:null, 4] | ||
let g:expected = [1, 4] | ||
AssertEqual g:expected, Flatten(g:array) | ||
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Execute (6 level nest list with null values): | ||
let g:array = [0, 2, [[2, 3], 8, [[100]], v:null, [[v:null]]], -2] | ||
let g:expected = [0, 2, 2, 3, 8, 100, -2] | ||
AssertEqual g:expected, Flatten(g:array) | ||
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Execute (all values in nested list are null): | ||
let g:array = [v:null, [[[v:null]]], v:null, v:null, [[v:null, v:null], v:null], v:null] | ||
let g:expected = [] | ||
AssertEqual g:expected, Flatten(g:array) |
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" | ||
" Flattens an arbitrarily-deep nested array, removing v:null values. | ||
" | ||
" Examples: | ||
" | ||
" :echo Flatten([]) | ||
" [] | ||
" :echo Flatten([0, 1, 2]) | ||
" [0, 1, 2] | ||
" :echo Flatten([0, 1, [2, 3, v:null]]) | ||
" [0, 1, 2, 3] | ||
" | ||
function! Flatten(array) abort | ||
" your implemention goes here | ||
endfunction |