How to get prime numbers in javascript
Prime numbers are the smallest positive integer that is evenly divisible only by itself and 1. In this article, we will learn how to get prime numbers in javascript. We will use the JavaScript Math object to calculate and retrieve the prime numbers.
prime or not in javascript
on Jan 01, 1970
function isPrime(num) {
for(var i = 2; i < num; i++)
if(num % i === 0) return false;
return num > 1;
}0
how to get prime numbers in javascript
on Jan 01, 1970
function isPrime(num) {
for (let i = 2; i * i <= num; i++)
if (num % i === 0)
return false;
return num > 1;
}0
JS print all prime numbers
on Jan 01, 1970
console.log(`The prime numbers between ${lowerNumber} and ${higherNumber} are:`);
// looping from lowerNumber to higherNumber
for (let i = lowerNumber; i <= higherNumber; i++) {
let flag = 0;
// looping through 2 to user input number
for (let j = 2; j < i; j++) {
if (i % j == 0) {
flag = 1;
break;
}
}
// if number greater than 1 and not divisible by other numbers
if (i > 1 && flag == 0) {
console.log(i);
}
}0
prime number in javascript
on Jan 01, 1970
// program to check if a number is prime or not
// take input from the user
const number = parseInt(prompt("Enter a positive number: "));
let isPrime = true;
// check if number is equal to 1
if (number === 1) {
console.log("1 is neither prime nor composite number.");
}
// check if number is greater than 1
else if (number > 1) {
// looping through 2 to number-1
for (let i = 2; i < number; i++) {
if (number % i == 0) {
isPrime = false;
break;
}
}
if (isPrime) {
console.log(`${number} is a prime number`);
} else {
console.log(`${number} is a not prime number`);
}
}
// check if number is less than 1
else {
console.log("The number is not a prime number.");
}0
The above code creates a function that returns all the primes up to a given number:
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