19_control_flow_ex06.js

// falsy value are: Falsy, undefined, null, '', false, 0, NaN

const array = [0, null, undefined, '', 1, 2, 3];


function countTruthy(array) {
    let count = 0;
    for (let value of array) {
        if (value) {
            count++;  // here, we are looking for truthy value.
        }
    }
    return count;

};

// calling function
console.log("Truthy number count:", countTruthy(array));

// Array contains 7 values but 4 of them are falsy value.
// Our result only counts truthy value. Hence, result is 3.