Conventions used

There are a number of text conventions used throughout this book.

Code in text: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles.

Here is an example “With web3.js installed, to instantiate web3, here is some typical JavaScript code.”

A block of code is set as follows:

componentDidMount = async () => {
  const web3 = await getWeb3();
  const contractInstance = await getInstance(web3);
   ...
  this.setState({ contractInstance: contractInstance });
}

Any command-line input or output is written as follows:

npm install -g create-react-app

Bold: Indicates a new term, an important word, or words that you see onscreen. For instance, words in menus or dialog boxes appear in bold. Here is an example: “Select cat-in-blockchain and click the PUBLISH button.”

Tips or important notes

Appear like this.