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<!DOCTYPE html> <html> <body> <p>Modify an array value of an object.</p> <p id="demo"></p> <script> let x = ""; const myObj = { "name":"John", "age":30, "cars":[ "Ford", "BMW", "Fiat" ] }; myObj.cars[1] = "Mercedes"; for (let i in myObj.cars) { x += myObj.cars[i] + "<br>"; } document.getElementById("demo").innerHTML = x; </script> </body> </html>