Web Reference: Jun 15, 2017 · push pushes arrays as one item, concat concats arrays, or an array with an item, beside the different return types. The push() adds elements to the end of an array and returns the new length of the array. Thus your return here is invalid. The concat() method is used to merge arrays. Nov 28, 2025 · This blog dives deep into the root causes of this issue, explaining the inner workings of `concat ()` and `push ()`, how they interact with `reduce ()`, and why one method fails where the other succeeds. Sep 22, 2017 · push() : The push() method adds one or more elements to the end of an array and returns the new length of the array. (MDN) concat() : The concat() method is used to merge two or more arrays. This method does not change the existing arrays, but instead returns a new array. (MDN)
YouTube Excerpt: In this video, we'll compare and contrast the two methods
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