The code from the Learn JavaScript the Hard Way module JavaScript Level 1 exercises. This is a mirror of the code I have in the book, so if you're struggling you can use this to compare against your attempts.
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const invincible = 94;
let changeme = 82;
console.log(`invincible=${invincible} but changeme=${changeme}`);
// this will work just fine
changeme = 100;
// uncomment this to see how you can't do it
// invincible = 100000;
console.log(`After change: invicible=${invincible} but changeme=${changeme}`);