how to find a prime number in a array in java script

[wintran67]

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[mahdi-eth]

To find prime numbers within an array in JavaScript, you can create a function that checks each number in the array for primality. Here's an example:
function isPrime(num) {
if (num <= 1) return false; // Numbers less than or equal to 1 are not prime

// Check for factors from 2 to the square root of the number
for (let i = 2; i <= Math.sqrt(num); i++) {
if (num % i === 0) return false; // If the number is divisible by any other number, it's not prime
}
return true; // If no factors other than 1 and itself, it's prime
}

// Filter out the numbers which are not prime
function findPrimesInArray(arr) {
return arr.filter((num) => isPrime(num));
}

// Example usage:
const numbers = [2, 3, 4, 5, 6, 7, 8, 9, 10];
const primeNumbers = findPrimesInArray(numbers);
console.log("Prime numbers in the array:", primeNumbers);