d3js-v4-egghead/data/data.js

let data = [
  { score: 63, subject: "Mathematics" },
  { score: 82, subject: "Geography" },
  { score: 74, subject: "Spelling" },
  { score: 97, subject: "Reading" },
  { score: 52, subject: "Science" }
];

data = [
  { score: 63, subject: "Mathematics" },
  { score: 82, subject: "Geography" },
  { score: 74, subject: "Spelling" },
  { score: 97, subject: "Reading" },
  { score: 52, subject: "Science" },
  { score: 74, subject: "Chemistry" },
  { score: 97, subject: "Physics" },
  { score: 52, subject: "ASL" }
];