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<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Loan Calculator</title> </head> <body> <button type="button" onclick="test()">Test Array Functions</button> <div id="array"></div> <div id="ends"></div> <div id="middle"></div> </body> </html>
// returns the sum of the first and last values in an array. function addEnds(list) { let ends = list[0] + list[list.length-1]; return ends; } // returns the value of the middle element in an array. // If the array has an even number of elements, // then this function must return the average of the two middle elements. function getMiddle(list) { const len = list.length; const middle = parseInt(len / 2); // get Integer value if (len == 0) { // empty list return 0 } else if (len % 2) {// odd elements return list[middle] // middle element } else { // even elements return (list[middle] + list[middle - 1]) / 2 // average 2 center elements } } function createRandomArray() { const len = parseInt(Math.random() * 10) + 1; // random length 1 to 10 let arr = new Array(len); for (i = 0; i < len; i++) { arr[i] = (Math.round((Math.random() * 40)-20)* 10) / 10; // random value -20< x >20 } return arr; } function test() { debugger; array = createRandomArray(); document.getElementById('array').innerHTML = "["+ array +"]"; document.getElementById('ends').innerHTML = "Ends = "+ addEnds(array); document.getElementById('middle').innerHTML = "Middle = "+ getMiddle(array); }