Javascript Concat Method To Join - Latest Information & Updates 2026

Web Reference: Description The concat() method concatenates (joins) two or more arrays. The concat() method returns a new array, containing the joined arrays. The concat() method does not change the existing arrays. Jul 10, 2025 · 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. const a = ['a', 'b', 'c']; const b = ['d', 'e', 'f']; const c = [...a, ...b]; // c = ['a', 'b', 'c', 'd', 'e', 'f'] It is also the fastest way to concatenate arrays in JavaScript today. However, when dealing with large arrays, it is more efficient to chain them (concatenate logically):

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