Web Reference: Jul 10, 2025 · The flat() method removes empty slots if the array being flattened is sparse. For example, if depth is 1, both empty slots in the root array and in the first level of nested arrays are ignored, but empty slots in further nested arrays are preserved with the arrays themselves. Dec 3, 2014 · There is now an ES proposal for an Array.prototype.flat method. It is currently at stage 3, meaning it's likely to be implemented by browsers soon (ish) and make it into the spec in its current form. Arrays displayed in HTML are automatically converted to strings. To display the full structure (including brackets), use JSON.stringify (). The flat() method concatenates sub-array elements. Optional. How deep a nested array should be flattened. Default is 1. The flattened array.
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