JavaScript Filter

// Filter in Javascript // Datas const userDatas = [ {firstName : "Aboubacar" , lastName : "Barry"}, {firstName : "Bill" , lastName : "Gates"}, {firstName : "Amadou" , lastName : "Diakité"} ] // filter function const filteredDatas = (datas,props,str)=>{ if(!props || props === null){ return null; } const filter = datas.filter(data=>{ if(data.[props].startsWith(str)){ return data } }) // global return  return (filter.length === 0 ? "Not Founds In Tables" : filter); } // results filteredDatas(userDatas,"firstName","A") // [ {firstName : "Aboubacar" , lastName : "Barry"}, {firstName : "Amadou" , lastName : "Diakité"}] filteredDatas(userDatas,"","M") // null