Apply a unary function to each element retrieved from a four-dimensional nested input array according to a callback function and assign results to elements in a four-dimensional nested output array.
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The `stdlib-js/array-base-unary4d-by` package is a JavaScript library for applying a unary function to each element of a four-dimensional nested input array, based on a callback function, and assigning the results to a corresponding output array. It is part of the stdlib project, a standard library for numerical and scientific computing in JavaScript, designed for use in both browsers and Node.js environments.