fun-fun-function-reduce-4

reduce2.js

/* file we're processing
random name,waffle iron,80,2
random name,blender,200,1
random name,knife,10,4
hulk hogan,waffle iron,80,1
hulk hogan,blender,180,3
hulk hogan,pot,90,3
*/

const fs = require('fs')
// mission: parse text-file and turn it into a structured dict/list

var output = fs.readFileSync('4-data.txt', 'utf8')
  .trim()
  .split('\n')
  .map(line => line.split(','))
  .reduce((customers, line) => {
    customers[line[0]] = customers[line[0]] || []
    customers[line[0]].push({
      name: line[1],
      price: line[2],
      quantity: line[3]
    })
    return customers
  }, {})

console.log(JSON.stringify(output, null, 2))