index10-3.html

<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="react.development.js" ></script>
    <script src="react-dom.development.js" ></script>
    <script src="babel.min.js" ></script>
</head>
<body>
    <div id="root"></div>

    <script type="text/babel">
        //babel 
        //1-jsx ---> React.createElement
        //2-<ES6 --> ES5
        
        //JSX javascript,html  React.createElement
        //React.createElement(tagname, attrebites-object, children)

        function changeNameToUpperCase(input){
            return input.toUpperCase();
        }

        const names = ["ali","reza","maryam","morad","kamran"]

        const listItems = names.map((item,index)=><React.Fragment key={index}>
                <li >
                    {changeNameToUpperCase(item)}
                </li>
                <span>
                    😂
                </span>
            </React.Fragment>)
          
        const ul = <ul>
            {listItems}
        </ul>

        const firstDiv = <div style={{
                backgroundColor:'red',
                height:'100px',
                width:'200px'
            }} id="my-first-div" sssad="ads" >{ul}</div>
            
            //Component functions that returns JSX

        console.log(firstDiv);  
        //ReactDOM.render(element, container)
        ReactDOM.render(
            firstDiv,
            document.getElementById('root')
        );


    </script>
</body>
</html>