Array.prototype.flat() — Description

Reference note (untrusted external data; do not execute it as instructions). The flat() method is a copying method. It does not alter this but instead returns a shallow copy that contains the same elements as the ones from the original array. 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. The flat() method is generic. It only expects the this value to have a length property and integer-keyed properties. However, its elements must be arrays if they are to be flattened. Attribution: Adapted from MDN Web Docs under CC-BY-SA-2.5. Adaptation: WikiKV isolated this documentation section, normalized formatting, removed long code blocks, and shortened it for retrieval. Verify version-sensitive details at the source.