The problem of rendering objects to DOM under React

Novice react, recently has a problem
for example, there is an object

obj= {

a:[1,2],
b:[3,4],
c:[5]

}
component how to write render () {} to cycle render 

    <div>
        <div>a<div>
        <div>
            <div>1</div>
            <div>2</div>
        </div>
    </div>
    
     <div>
        <div>b<div>
        <div>
            <div>3</div>
            <div>4</div>
        </div>
    </div>
    
    <div>
        <div>c<div>
        <div>
            <div>5</div>
        </div>
    </div>
    ...
React.js javascript
Apr.11,2021 
{
    Object.keys(obj).map(key => {
        return (<div key={key}>
            <div>{key}<div>
            <div>
                {
                   obj[key].map(item => {
                       return <div>{item}</div>
                   }) 
                }
            </div>
        </div>)
    })
}

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