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 · JavaScript arrays are foundational to data manipulation, and methods like `concat ()` and `push ()` are staples for combining or modifying arrays. While both can add elements to an array, their behavior differs drastically—especially when used with higher-order functions like `reduce ()`. Mar 16, 2025 · Most common ways to add elements to an array in JavaScript are push () and concat (). At first glance, they might seem interchangeable with just a slight behavioral difference: push ()...
YouTube Excerpt: This video teaches about the array
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