<ul><li>The balance between extract and inlining of functions is one of the hardest refactorings to get right.</li><li>Context transference refers to the amount of information that needs to be passed between boundaries when extracting a function.</li><li>A poor refactor occurs when 100% of the callers' context needs to be transferred for the new function to be meaningful, resulting in increased cognitive load.</li><li>Extraction refactorings should operate on a strict subset of the context of the parent function to be meaningful and not detrimental to reading code.</li></ul>

Context Transference

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