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List view

const nestedArray = [1, [2], [[3], 4], 5];

const flatten = nestedArray =>
  nestedArray.reduce(
    (flat, item) => flat.concat(Array.isArray(item) ? flatten(item) : [item]),
    []
  );

flatten(nestedArray);

#lodash #javascript #flatten

Deep flatten Json

const recurse = (rows) => _.map((rows), (row) => row.collapsed ? [row] : [row, recurse(row.children)]);

const flattenTree = tree => _.flattenDeep(recurse(tree));

flatten a nested array

Deep flatten Json

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