Lesson 21 / 25

Performance basics

Understand Performance basics as a useful part of Dart.

The essential idea

Performance basics gives you one practical part of Dart. Start by naming the input, the change, and the expected result. This mental model matters before any syntax rule.

Run a tiny experiment

Use a minimal example. Predict what changes, run it, then explain the observed result.

// Explore Performance basics with one focused example.
value = 0
print(value)

Output:

0

Avoid this trap

Do not memorize Performance basics in isolation. Change one value in a small example and use feedback to correct your understanding.

Quick check

Quick check: What is a good first practice for Performance basics?

  • Run one small focused example.
  • Memorize without testing.
  • Ignore feedback.
Answer

Run one small focused example. — Small experiments reveal cause and effect.