categories is created new in every render cycle by computeCategories. After that, we don’t update it at all. Every time data changes, React will re-render and thus call computeCategories again - giving us a new Array of categories.
categories
computeCategories
data
Oh I didn't know React rerenders the entire component for a state change. Thanks for the explanation!
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categories
is created new in every render cycle bycomputeCategories
. After that, we don’t update it at all. Every timedata
changes, React will re-render and thus callcomputeCategories
again - giving us a new Array of categories.Oh I didn't know React rerenders the entire component for a state change. Thanks for the explanation!