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class Counter extends Component {
constructor(props) {
super(props);
this.state = { count: props.initCounter };
}
increase = () => this.setState(prevState => ({ count: prevState.count + 1 }));
decrease = () => this.setState(prevState => ({ count: prevState.count - 1 }));
render() {
const { count } = this.state;
return (
<div>
{this.props.children({
count,
increase: this.increase,
decrease: this.decrease
})}
</div>
);
}
}
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