let eightGb = phones.filter(function(item, i){
    if(item.ram == '8gb')
        return item;
})
console.log(eightGb)

let eightGb = phones.filter(function(item) {
    return item.ram == '8gb';
});
console.log(eightGb);

let eightGb = phones.filter(({ram}) => ram == '8gb');
console.log(eightGb);