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<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>JavaScript ES6 Constants are Not Truly Immutable</title> </head> <body> <script> // Changing object property value const PERSON = {name: "Peter", age: 28}; document.write(PERSON.age + "<br>"); // 28 PERSON.age = 30; document.write(PERSON.age + "<hr>"); // 30 // Changing array element const COLORS = ["red", "green", "blue"]; document.write(COLORS[0] + "<br>"); // red COLORS[0] = "yellow"; document.write(COLORS[0]); // yellow </script> </body> </html>
