feat: add adjacent difference array method #6077
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Summary
This PR introduces a new array utility, _.adjacentDifference, which computes the difference between consecutive elements in an array. The function is designed to follow Lodash’s existing iteratee-driven and non-throwing semantics, making it predictable, composable, and easy to integrate into existing workflows.
Motivation
Computing differences between adjacent values is a common operation in data analysis, time-series processing, and numerical transformations. While Lodash provides rich array manipulation utilities, there is currently no dedicated helper for this pattern. Users often reimplement this logic using _.map or manual loops, leading to repetitive and less readable code.
This addition fills that gap with a small, focused API that aligns with Lodash’s design philosophy.