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. I'm trying to combine 2 arrays in JavaScript into one. This is a quick example, I want to be able to combine them so that when the second line is read the 4th element in the array would return "d" How would I do this?
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