bigO1.js

// get the lenght of an array list

var fruits = ["Banana", "Orange", "Apple", "Mango"];
var numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14];

function getListLenght(list) {
    var _lenght = list.length;
    return _lenght;
}

console.log('The number of item in list is: ', getListLenght(fruits));      // 4
console.log('The number of item in list is: ', getListLenght(numbers));     // 14

// **********************************************************************************
// - In this case the run time of getListLenght is costant: O(1)
// - It'll take the same time to run no matter the number of item in the array list
// **********************************************************************************