return arr.filter (function (element) {
if (element <= 2) {
return element === 2;
};
for (let i=2; i<= Math.sqrt(element); i++) {
if (element % i === 0) {
return false;
}
return true;
});
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return arr.filter (function (element) {
if (element <= 2) {
return element === 2;
};
for (let i=2; i<= Math.sqrt(element); i++) {
if (element % i === 0) {
return false;
}
};
return true;
});