JavaScript programs natural numbers.

JavaScript programs that involve finding natural numbers within a given range or processing natural numbers in different ways.

1. Finding Natural Numbers in a Given Range.

function findNaturalNumbersInRange(start, end) {
  const naturalNumbers = [];
  for (let i = Math.max(start, 1); i <= end; i++) {
    naturalNumbers.push(i);
  }
  return naturalNumbers;
}

console.log(findNaturalNumbersInRange(1, 10)); // Output: [1, 2, 3, ..., 10]

2. Finding the Sum of Natural Numbers up to a Given Number

function sumOfNaturalNumbers(n) {
  let sum = 0;
  for (let i = 1; i <= n; i++) {
    sum += i;
  }
  return sum;
}

console.log(sumOfNaturalNumbers(10)); // Output: 55 (1 + 2 + ... + 10)

3. Finding the First n Natural Numbers.

function firstNNaturalNumbers(n) {
  const naturalNumbers = [];
  for (let i = 1; i <= n; i++) {
    naturalNumbers.push(i);
  }
  return naturalNumbers;
}

console.log(firstNNaturalNumbers(5)); // Output: [1, 2, 3, 4, 5]

4. Checking if a Number is Natural.

function isNaturalNumber(num) {
  return Number.isInteger(num) && num > 0;
}

console.log(isNaturalNumber(5)); // Output: true
console.log(isNaturalNumber(-3)); // Output: false
console.log(isNaturalNumber(0)); // Output: false

5. Finding Even Natural Numbers in a Range.

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function findEvenNaturalNumbersInRange(start, end) {
  const evenNumbers = [];
  for (let i = Math.max(start, 1); i <= end; i++) {
    if (i % 2 === 0) {
      evenNumbers.push(i);
    }
  }
  return evenNumbers;
}

console.log(findEvenNaturalNumbersInRange(1, 10)); // Output: [2, 4, 6, 8, 10]

6. Finding Odd Natural Numbers in a Range.

function findOddNaturalNumbersInRange(start, end) {
  const oddNumbers = [];
  for (let i = Math.max(start, 1); i <= end; i++) {
    if (i % 2 !== 0) {
      oddNumbers.push(i);
    }
  }
  return oddNumbers;
}

console.log(findOddNaturalNumbersInRange(1, 10)); // Output: [1, 3, 5, 7, 9]

7. Finding the Product of Natural Numbers up to n .

function productOfNaturalNumbers(n) {
  let product = 1;
  for (let i = 1; i <= n; i++) {
    product *= i;
  }
  return product;
}

console.log(productOfNaturalNumbers(5)); // Output: 120 (1 * 2 * 3 * 4 * 5)

8. Sum of Even Natural Numbers in a Given Range.

function sumOfEvenNaturalNumbersInRange(start, end) {
  let sum = 0;
  for (let i = Math.max(start, 1); i <= end; i++) {
    if (i % 2 === 0) {
      sum += i;
    }
  }
  return sum;
}

console.log(sumOfEvenNaturalNumbersInRange(1, 10)); // Output: 30 (2 + 4 + 6 + 8 + 10)

9. Sum of Odd Natural Numbers in a Given Range.

function sumOfOddNaturalNumbersInRange(start, end) {
  let sum = 0;
  for (let i = Math.max(start, 1); i <= end; i++) {
    if (i % 2 !== 0) {
      sum += i;
    }
  }
  return sum;
}

console.log(sumOfOddNaturalNumbersInRange(1, 10)); // Output: 25 (1 + 3 + 5 + 7 + 9)

10. Finding Prime Natural Numbers in a Given Range

function isPrime(num) {
  if (num <= 1) return false;
  for (let i = 2; i < num; i++) {
    if (num % i === 0) return false;
  }
  return true;
}

function findPrimeNaturalNumbersInRange(start, end) {
  const primes = [];
  for (let i = Math.max(start, 1); i <= end; i++) {
    if (isPrime(i)) {
      primes.push(i);
    }
  }
  return primes;
}

console.log(findPrimeNaturalNumbersInRange(1, 20)); // Output: [2, 3, 5, 7, 11, 13, 17, 19]