Lesson 3 / 25

Variables and values

Understand Variables and values as a useful part of Time & Space Complexity (Big-O).

The essential idea

Variables and values gives you one practical part of Time & Space Complexity (Big-O). Start by naming the input, the change, and the expected result. This mental model matters before any syntax rule.

Place this on the learning path

A complete program moves from an idea to source code and a checked result. This topic is one step in that path.

A learning path for Time & Space Complexity (Big-O) from source to output.
Figure 2.1 — Keep the complete path visible.

Avoid this trap

Do not memorize Variables and values 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 Variables and values?

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

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