Day21.js

// Coding Challenge
// Write a function called calculateMean that takes an array of numbers as input and returns the mean (average) of those numbers.
// In math, the mean is the average of a set of numbers, or the numeric value that represents the center of a collection of numbers.
// Constraints:
// - The input array may contain positive and negative integers.
// - The input array may be empty. If it is empty, the function should return 0.

const calculateMean = (arr) => {
    if (arr.length === 0) {
        return 0;
    }
    
    // let sum = 0;
    // for (let num of arr) {
    //     sum += num;
    // }
    let sum = arr.reduce((acum,curElem) => acum + curElem,0);
    console.log(sum);
    return sum / arr.length;
}

console.log(calculateMean([1, 2, 3, 4, 5])); // Output: 3
console.log(calculateMean([10, 20, 30])); // Output: 20
console.log(calculateMean([-1, 0, 1])); // Output: 0
console.log(calculateMean([])); // Output: 0