collapse()
The collapse method collapses a collection of arrays into a single, flat collection:
const collection = collect([[1], [{}, 5, {}], ["xoxo"]]);
const collapsed = collection.collapse();
collapsed.all();
//=> [1, {}, 5, {}, 'xoxo']
const collection = collect([[1, 2, 3], [4, 5, 6], [7, 8, 9]]);
const collapsed = collection.collapse();
collapsed.all();
//=> [1, 2, 3, 4, 5, 6, 7, 8, 9]