Web Reference: Feb 22, 2011 Β· What is the most efficient way to concatenate N arrays of objects in JavaScript? The arrays are mutable, and the result can be stored in one of the input arrays. Aug 5, 2025 Β· Using Array.from with a mapping function efficiently concatenates arrays. The mapping function combines multiple arrays into a single array by spreading them within Array.from, resulting in a concatenated array with concise syntax and good performance. The concat() method of Array instances is used to merge two or more arrays. This method does not change the existing arrays, but instead returns a new array.
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