JAVASCRIPT

map function in react

function NameList() {
	const names = ['Bruce', 'Clark', 'Diana']
    return (
    	<div>
      {names.map(name => <h2>{name}</h2>)}
      	</div>
    )
}

map an array in react

//lets say we have an array of objects called data
<div className="sample">
  {data.map((item)=>{
    return(
  <div key={item.id} className="objectname">
    <p>{item.property1}</p>
    <p>{item.property2}</p>
  </div>
    );
  });
</div>

map method in react

function ShowName() {
  const userNames = ["Kunal", "Braj", "Sagar", "Akshay"];
  
  return (
    <>
      <div>
            { 
              
              userNames.map((elem) => {
              <h1>{elem}</h1>
              })
            
            }
          </div> 
    </>
  );
}

export default ShowName;

map function react

// REACT.JS

const arr = [{name: "test"}, {name: "test1"}, {name: "test2"}]

arr.map((n, i) => {
	return <p key={i}>{ n.name }</p>
})

react map component in

render() {
	return (
      	// using a arrow function get the looping item and it's index (i)
		this.state.data.map((item, i) => {
		  <li key={i}>Test</li>
		})
	);
}

Use of map in react

const todoItems = [
  {
    id: 1,
    text:"todo 1"
  },
  {
    id: 2,
    text:"todo 3"
  },
  {
    id: 3,
    text:"todo 3"
  }
];
const todoItems = todos.map((todo) =>
  <li key={todo.id}>
    {todo.text}
  </li>
);

map in react

const array={{firstName:"x", lastName:"y"},{firstName:"a", lastName:"b"}}

// Method 1: Without using "{}"
array.map((item)=>(
  <ComponentName fName={item.firstName} lName={item.lastName} />
));

// Method 2: With using "{}"
array.map((item)=>{
  return(<ComponentName fName={item.firstName} lName={item.lastName} />)
});

how to map array in react

export const Articles = props => {
  const [articles, setArticle] = React.useState(props.data || [])
  React.useEffect(() => {
    if (Array.isArray(articles) && articles.length < 1) {
      setArticle([
        {
          title: 'how to map array in react',
          content: `read this code!`,
        },
      ])
    }
  }, [articles])
  return (
    <div>
      {Array.isArray(articles) &&
        articles.map((item, key) => (
          <article key={key}>
            <h2>{item.title}</h2>
            <p>{item.content}</p>
          </article>
        ))}
    </div>
  )
}

map react

const numbers = [1, 2, 3, 4, 5];
const doubled = numbers.map((number) => number * 2);
console.log(doubled);