is there any other way to get a reduced array? because my array is not getting returned.I have no clue where my logic is going wrong

i am trying to get a reduced array. my output is supposed to be like [1,5,4] but it gives me an empty array.

let arr=[1,[2,3],4]
let newarr=[]
 
let myarr=()=>{
    for(i=0;i<3;i++){
        array=arr[i].reduce
        newarr.push(array)
        return newarr
    }
}

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