Returns all numbers either even, odd or prime between a range of numbers.

BetweenNums.js

function numbersBetween(num1, num2) {
    const min = Math.min(num1, num2);
    const max = Math.max(num1, num2);
  
    const result = [];
    for (let i = min + 1; i < max; i++) {
      result.push(i);
    }
  
    return result;
}
  
function isPrime(number) {
    if (number <= 1) {
      return false;
    }
    
    for (let i = 2; i <= Math.sqrt(number); i++) {
      if (number % i === 0) {
        return false;
      }
    }
  
    return true;
}
  
const betweenNums = (a, b, type) => {
    const nums = numbersBetween(a, b);

    if (type === 'even') {
        return nums.filter(item => item % 2 === 0);
    } else if (type === 'odd') {
        return nums.filter(item => item % 2 !== 0);
    } else if (type === 'prime') {
        return nums.filter(item => isPrime(item));
    }
    return nums;
  }

console.log(betweenNums(3, 11, 'even'));
console.log(betweenNums(15, 1, 'odd'));