js is prime number code example
Example 1: javascript find a prime number
function isPrime(num) {
if(num < 2) return false;
for (let k = 2; k < num; k++){
if( num % k == 0){
return false;
}
}
return true;
}
Example 2: javascript find prime number
function test_prime(n){
if (n===1) {
return false;
}else if(n === 2){
return true;
}else{
for(var x = 2; x < n; x++){
if(n % x === 0){
return false;
}
}
return true;
}
}
console.log(test_prime(37));
Example 3: prime or not in javascript
function isPrime(num) {
for(var i = 2; i < num; i++)
if(num % i === 0) return false;
return num > 1;
}
Example 4: Javascript prime number check
function is_prime (n) {
if (n < 3) return n > 1;
else if (n % 2 === 0 || n % 3 === 0) return false;
else if (n < 25) return true;
let i = 5;
while (i * i <= n ) {
if (n % i === 0 || n % (i + 2) === 0) return false;
i += 6;
}
return true;
}