flatten array

function flattenArray(array){
    var newArray=[]
    var stillHasNested=false;
    array.forEach((item,i)=>{
        if(item instanceof Array)
        {
           item.map(child=>{
               newArray.push(child)
               if(child instanceof Array)
                {
                    stillHasNested=true
                }
           })
        }
        else
            newArray.push(item)
    })
    
    if(stillHasNested)
        flattenArray(newArray)
    else
        return newArray
}

console.log(flattenArray([1,[[3,[25,53,5],3],2,[12,12,32]]]))