Web Reference: Jun 28, 2014 ยท There are essentially two different possibilities: Use a data structure (linked list, some tree structure, etc.) which makes it possible to allocate memory separately for each new element in a list. Store the data in a contiguous memory area. Jan 16, 2026 ยท But with large arrays (e.g., 100,000+ elements), performance can degrade drastically if you use inefficient techniques. This blog dives into the best ways to insert arrays in JavaScript, focusing on **performance optimization for large datasets**. Values are appended to a copy of this array. These values are appended to a copy of arr. It must be of the correct shape (the same shape as arr, excluding axis). If axis is not specified, values can be any shape and will be flattened before use. The axis along which values are appended.
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