Effects are an escape hatch from the React paradigm. They let you “step outside” of React and synchronize your components with some external system like a non-React widget, network, or the browser DOM.
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You Might Not Need an Effect – React
Effects are an escape hatch from the React paradigm. They let you “step outside” of React and synchronize your components with some external system like a non-React widget, network, or the browser DOM.
Full article