Practical Microservices

Object Destructuring

Speaking of top-level, dependency-receiving functions, their syntax might be new to you. Continuing with the identity component, consider its top-level function:

function build ({ messageStore }) {
  // body omitted
}

The parameter list on this function has curly braces, and those smell like object literals. But you’re probably used to having to write object literals with key–value pairs separated by colons, such as: { key: ’value’ }.

ES6 introduced shorthand for extracting values out of objects and binding them to names in local scope. For example, let’s examine the identity component’s loadIdentity function:

video-tutorials/src/components/identity/load-identity.js

function loadIdentity (context) {
  const { ...