Pull-request review, inline chat and the test-first loop — GitHub Copilot's own feature

The concept

Because the slowest part of a junior developer's week is not typing — it is waiting for review, and re-reading your own change with fresh eyes. A reviewer that never gets tired is the highest-value use of this tool, and it is the one that survives code review policies at most companies.

Write the code, then ask for a review before you ask a person. Read every comment and either fix it or decide why it is wrong. Then write the test it asked for. Never merge on the strength of a green check from a tool — a passing test you did not read is not evidence.

Here is the shape of it, in the form you will actually use:

// A function with three problems. Ask Copilot to review it, not to fix it.
function averageScore(scores) {
  let total = 0;
  for (let i = 0; i <= scores.length; i++) {
    total += scores[i];
  }
  return total / scores.length;
}

// Ask for: (1) a review comment on each line that is wrong,
//           (2) the input that produces NaN,
//           (3) a rewritten version with the reason for each change.