//Write a function that will return an array with all of the numbers from 1 to 255.
function range(start, end) {
  return Array(end - start + 1).fill().map((_, idx) => start + idx)
}
var result = range(1,255); //numbers 1 to 255
console.log(result); //of array

//Next Question: Write a function that will return the summ of all the even numbers from 1 to 1000.
let sum=0
for(i=1; i<=1000;i++){
  if(i%2===0){
    sum=sum+i
  }
}
console.log(sum)
//end even numbers task

//3.) Write a function that returns the sum of all the odd numbers from 1 to 5000.
function isOdd(n) {
  return Boolean(n % 2);
}

function findSum(no) {
  let sum = 0;

  for (var i = 0; i < no; i++) {
    if (isOdd(i)) {
      sum += i;
    }
  }
  return sum;
}

console.log(findSum(5000));


// 4.) Write a function that returns the sum of all the values within an array.
// (e.g. [1,2,5] returns 8, [-5,2,5,12] returns 14).
let data = [1, 2, 5];

sum = data.reduce((a, b) => {
  return a + b;
});

console.log('The sum is: ', sum);

// 5.) Given an array with multiple values,
// write a function that returns the maximum number in the array.
console.log(Math.max(1, 3, 2, 7, 23, 56, 100));


// 6.) Given an array with multiple values,
//  write a function that returns the average of the values in the array.
// [1,3,5,7,20] average is 7.2
arry = [1, 3, 5, 7, 20];

function calculateAverage(array) {
    var total = 0;
    var count = 0;

    array.forEach(function(item, index) {
        total += item;
        count++;
    });

    return total / count;
}

console.log(calculateAverage(arry));


// 7.) Write a function that would return an array of all the odd numbers between 1 to 50.
console.log(Array(25).fill(2).map((x, i) => i * x + 1).join(', '))