let a3 = [4, "3", 6, 7, "12", 34, "56", 78, 90, 11];
function t3() {
a3.map(function (item, index) {
!isNaN(parseFloat(a3[index]));
});
}
console.log(t3());
function t3() {
return a3.map(function (item) {
return parseFloat(item);
}).filter(i => !isNaN(i))
}