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. JavaScript Array flat() is supported in all modern browsers since January 2020: Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more. Jul 23, 2025 · Merging or flattening an array of arrays in JavaScript involves combining multiple nested arrays into a single-level array. This process involves iterating through each nested array and appending its elements to a new array, resulting in a flattened structure.
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