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optimizing loop steps and conditions #13

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optimizing loop steps and conditions #13

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40 changes: 22 additions & 18 deletions src/prime.js
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Original file line number Diff line number Diff line change
@@ -1,24 +1,28 @@

function is_prime(n){
if(n <= 1) {
return false;
}
var end = Math.sqrt(n); // ((n as f64).sqrt() as u64);
for(var i=2 ; i <= end ; i++){
if (n % i == 0) {
return false;
}

function is_prime(n) {
if (n <= 1) {
return false;
}
if (n === 2 || n === 3) {
return true;
}
if (n % 2 === 0) {
return false;
}
var end = Math.sqrt(n); // ((n as f64).sqrt() as u64);
for (var i = 3; i <= end; i += 2) {
if (n % i == 0) {
return false;
}
return true
}
return true;
}

var start = Date.now()
var start = Date.now();
let c = 0;
for(var i=0;i<9000000;i++) {
if (is_prime(i)){
c++;
}
for (var i = 0; i < 9000000; i++) {
if (is_prime(i)) {
c++;
}
}
console.log(c);
console.log( (Date.now()) - start + "ms");
console.log(Date.now() - start + "ms");