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<!DOCTYPE html> <html> <body> <p>Click the button to get the sum from subtracting the numbers in the array right-to-left.</p> <button onclick="myFunction()">Try it</button> <p>Sum of numbers in array: <span id="demo"></span></p> <script> var numbers = [2, 45, 30, 100]; function getSum(total, num) { return total - num; } function myFunction(item) { document.getElementById("demo").innerHTML = numbers.reduceRight(getSum); } </script> </body> </html>