ECMAScript Cookbook

How to do it...

1. Open your command-line application, and navigate to your workspace.
2. Create a new folder named 10-05-reduce-to-transform-data.
3. Create a main.js file that defines a new class named Rocket that takes a constructor argument name and assigns it to an instance property:

// main.js 
class Rocket { 
  constructor(name) { 
    this.name = name; 
  } 
   } 

4. Create a main function with an array of nationality strings:

// main.js 
export function main() { 
  const nationalities = [ 
    'American', 
    'American', 
    'Chinese', 
    'American', 
    'Chinese', 
    'Chinese', 
    'Soviet', 
    'Soviet' 
  ]; 
} 

5. Use the reduce method to count the different nationalities:

// main.js export function main() { //... const nationalityCount = nationalities.reduce((acc, nationality) => { acc[nationality] ...