Валерий Петров

...
<Funck2 visible = {this.state.visible}/>
...

class FormWidget extends Component {
  state={
    isFormVisible: false,
  };

  handleButtonClick = () => {
    this.setState(prevState => ({
      isFormVisible: !prevState.isFormVisible,
    }));
  }

  render() {
    const { isFormVisible } = this.state;
    const buttonText = isFormVisible ? 'Hide form' : 'Show form';

    return (
      <Wrapper>
        <Button onClick={this.handleButtonClick}>
          {buttonText}
        </Button>
        <Form isVisible={isFormVisible} />
      </Wrapper>
    )
  }
}

nameFunc(value){

}
<a href="#" onClick={this.nameFunc(value)} index={value}>Link</a>

class TaskOutput extends Component {  
    render() {

        var list = [];
        for (var i = 0; i < localStorage.length; i++) {
            const list = JSON.parse(localStorage.getItem(localStorage.key(i)))
            list .push(
                <div className={'task'+i}>
                    <h1>{list['title']}</h1>
                    <p>{list['description']}</p>
                </div>
            )
        }
        return <div>list</div>;
    }
}

const array = [{ name: 'John', age: 32}];

const element = { name: 'Sally', age: 25 };

const newArray = [ ...array, element ];

// =>  [{ name: 'John', age: 32},  { name: 'Sally', age: 25 }]