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Optimize isPrime method. #5

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Optimize isPrime method. #5

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14 changes: 9 additions & 5 deletions interactive/ec.js
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Original file line number Diff line number Diff line change
Expand Up @@ -91,20 +91,24 @@
}
};

var isPrime = function( n ) {
var isPrime = function (n) {
n = +n;

if( n < 2 || n % 2 === 0 ) {
return n === 2;
}

for( var m = 3; m < n; m += 2 ) {
if( n % m === 0 ) {
return false;
let prime = n !== 1;
const sqrtN = Math.floor(Math.sqrt(n));

for (var m = 3; m < sqrtN + 1; m += 2) {
if (n % m === 0) {
prime = false;
break;
}
}

return true;
return prime;
};

///////////////////////////////////////////////////////////////////////////
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