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June 7, 2019 08:36
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Snippet for tracing changed component properties
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componentDidUpdate(prevProps, prevState) { | |
Object.entries(this.props).forEach(([key, val]) => | |
prevProps[key] !== val && console.log(`Prop '${key}' changed`) | |
); | |
Object.entries(this.state).forEach(([key, val]) => | |
prevState[key] !== val && console.log(`State '${key}' changed`) | |
); | |
} | |
// hook | |
function useTraceUpdate(props) { | |
const prev = useRef(props); | |
useEffect(() => { | |
const changedProps = Object.entries(props).reduce((ps, [k, v]) => { | |
if (prev.current[k] !== v) { | |
ps[k] = [prev.current[k], v]; | |
} | |
return ps; | |
}, {}); | |
if (Object.keys(changedProps).length > 0) { | |
console.log('Changed props:', changedProps); | |
} | |
prev.current = props; | |
}); | |
} |
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