Javascript:Filter using flatMap

In  given array filter positive numbers.

Code :

const arr = [5, -2, 7, -1, 9];

const nonNegative = arr.flatMap((item)=>{

    return (item>0)?[item]:[]

})

//using filter only

//const nonNegative = arr.filter((item)=>item > 0)

console.log(nonNegative)

Output:

[ 5, 7, 9 ]