SlideShare a Scribd company logo
'
ReactDOM.render(<List />,
document.getElementById("app"))
'
'
'
shouldComponentUpdate(nextProps, nextState) {
if (this.state.items === nextState.items) {
return false
}
return true
}
handleClick = () => {
let nextItems = this.state.items;
// Calculate new values
this.setState({
items: nextItems
})
}
shouldComponentUpdate(nextProps, nextState) {
if (this.state.items === nextState.items) {
return false
}
return true
}
handleClick = () => {
let nextItems = this.state.items;
nextItems.push(msg)
this.setState({
items: nextItems
})
}
A Cartoon intro to performance in React
A Cartoon intro to performance in React
A Cartoon intro to performance in React
A Cartoon intro to performance in React
A Cartoon intro to performance in React
A Cartoon intro to performance in React
A Cartoon intro to performance in React
A Cartoon intro to performance in React
A Cartoon intro to performance in React
A Cartoon intro to performance in React
A Cartoon intro to performance in React
A Cartoon intro to performance in React
A Cartoon intro to performance in React
A Cartoon intro to performance in React
A Cartoon intro to performance in React
A Cartoon intro to performance in React
A Cartoon intro to performance in React
A Cartoon intro to performance in React
A Cartoon intro to performance in React
A Cartoon intro to performance in React
A Cartoon intro to performance in React
A Cartoon intro to performance in React
A Cartoon intro to performance in React
A Cartoon intro to performance in React
A Cartoon intro to performance in React
A Cartoon intro to performance in React
A Cartoon intro to performance in React
A Cartoon intro to performance in React
A Cartoon intro to performance in React
A Cartoon intro to performance in React
A Cartoon intro to performance in React
A Cartoon intro to performance in React

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A Cartoon intro to performance in React

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  • 109. handleClick = () => { let nextItems = this.state.items; // Calculate new values this.setState({ items: nextItems }) }
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  • 127. shouldComponentUpdate(nextProps, nextState) { if (this.state.items === nextState.items) { return false } return true }
  • 128. handleClick = () => { let nextItems = this.state.items; nextItems.push(msg) this.setState({ items: nextItems }) }