JavaScript Deep Merge

I recently shared how you can merge object properties with the spread operator but this method has one big limitation:  the spread operator merge isn’t a “deep” merge, meaning merges are recursive.  Moreover nested object properties aren’t merged — the last value specified in the merge replaces the last, even when there are other properties that should exist. const defaultPerson = { name: […]
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Link: https://davidwalsh.name/javascript-deep-merge