that, let’s say that Nick is feeling generous and he wants to give his Chevy Volt to someone named Dave. To do this go back to invoke.js and change the function from createCar to changeCarOwner and input 'changeCarOwner', args: ['CAR10', 'Dave'], chainId: 'mychannel', txId: tx_id }; The first argument – CAR10 – reflects the car that will be changing owners. The second argument – Dave – defines the new owner of again and ensure that Dave is now associated with the CAR10 key: node query.js It should return this result: Response is {"colour":"Red","make":"Chevy","model":"Volt","owner":"Dave"} The ownership of

that, let’s say that Nick is feeling generous and he wants to give his Chevy Volt to someone named Dave. To do this go back to invoke.js and change the function from createCar to changeCarOwner and input 'changeCarOwner', args: ['CAR10', 'Dave'], chainId: 'mychannel', txId: tx_id }; The first argument – CAR10 – reflects the car that will be changing owners. The second argument – Dave – defines the new owner of Save and execute the program again: node invoke.js Now let’s query the ledger again and ensure that Dave is now associated with the CAR10 key: node query.js It should return this result: 72 Chapter 3

1Better Code: Contracts Dave Abrahams & Sean Parent What's holding our software together? Can we do better than duct tape and good intentions? 2© 2023 Adobe. All Rights Reserved. Adobe’s Software Veteran David Sankel Principal Scientist Software Technology Lab Adobe’s C++ Standardization Lead Dave Abrahams Principal Scientist Software Technology Lab Hylo Language Co-creator Nick DeMarco n. An indication that a correct function, correctly called, could not uphold its postcondition. —Dave and Sean 83© 2023 Adobe. All Rights Reserved. Definition | Error (without qualification) Error

25Precison and Accuracy Accuracy: measurements are "right" Precision: measurements are "informative" Dave Steffen "It's a Bug Hunt" - Armor Plate Your Unit Tests Part 1: Testing 26Precision for Unit Tests Validly Don't do this! We have just proven that "The code we wrote is the code we wrote" ** ** Dave Farley, "The 3 Types of Unit Test in TDD" https://youtu.be/W40mpZP9xQQ YouTube channel: https://www Validity 43Test Validly We have just proven that "The code we wrote is the code we wrote" ** ** Dave Farley, "The 3 Types of Unit Test in TDD" https://youtu.be/W40mpZP9xQQ YouTube channel: https://www

that, let’s say that Nick is feeling generous and he wants to give his Chevy Volt to someone named Dave. To do this go back to invoke.js and change the function from createCar to changeCarOwner and input 'changeCarOwner', args: ['CAR10', 'Dave'], chainId: 'mychannel', txId: tx_id }; The first argument – CAR10 – reflects the car that will be changing owners. The second argument – Dave – defines the new owner of Save and execute the program again: node invoke.js Now let’s query the ledger again and ensure that Dave is now associated with the CAR10 key: node query.js It should return this result: 5.1. Writing

that, let’s say that Nick is feeling generous and he wants to give his Chevy Volt to someone named Dave. To do this go back to invoke.js and change the function from createCar to changeCarOwner and input 'changeCarOwner', args: ['CAR10', 'Dave'], chainId: 'mychannel', txId: tx_id }; The first argument – CAR10 – reflects the car that will be changing owners. The second argument – Dave – defines the new owner of again and ensure that Dave is now associated with the CAR10 key: node query.js It should return this result: Response is {"colour":"Red","make":"Chevy","model":"Volt","owner":"Dave"} The ownership of

that, let’s say that Nick is feeling generous and he wants to give his Chevy Volt to someone named Dave. To do this go back to invoke.js and change the function from createCar to changeCarOwner and input 'changeCarOwner', args: ['CAR10', 'Dave'], chainId: 'mychannel', txId: tx_id }; The first argument – CAR10 – reflects the car that will be changing owners. The second argument – Dave – defines the new owner of again and ensure that Dave is now associated with the CAR10 key: node query.js It should return this result: Response is {"colour":"Red","make":"Chevy","model":"Volt","owner":"Dave"} The ownership of

that, let’s say that Nick is feeling generous and he wants to give his Chevy Volt to someone named Dave. To do this go back to invoke.js and change the function from createCar to changeCarOwner and input 'changeCarOwner', args: ['CAR10', 'Dave'], chainId: 'mychannel', txId: tx_id }; The first argument – CAR10 – reflects the car that will be changing owners. The second argument – Dave – defines the new owner of Save and execute the program again: node invoke.js Now let’s query the ledger again and ensure that Dave is now associated with the CAR10 key: node query.js It should return this result: 6.1. Writing

There’s a cost in terms of space here, however88From Mister Punch by Neil Gaiman and Dave McKean (Art by Dave McKean) 899091 There might be good reasons for this get/set pair, or there might not. It and cleaner to simply let the exception get out for some other function to handle it118119FLOOD by Dave McKean 120121122123124 Removing all the names to make this construct semantically disconnected from