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<!DOCTYPE html> <html> <body> <h2>JavaScript Function Rest Parameter</h2> <p>The rest parameter (...) allows a function to treat an indefinite number of arguments as an array:</p> <p id="demo"></p> <script> function sum(...args) { let sum = 0; for (let arg of args) sum += arg; return sum; } let x = sum(4, 9, 16, 25, 29, 100, 66, 77); document.getElementById("demo").innerHTML = x; </script> </body> </html>