Published lesson · 25 minutes

Values and variables

Objective: Store text and numbers in named variables and use them to describe a small problem.

Understand the idea

This lesson focuses on values and variables. Store text and numbers in named variables and use them to describe a small problem. We will use a familiar community situation to make the idea concrete, then break it into decisions you can explain. You do not need special equipment or previous experience beyond the course prerequisites.

A community event form can store its name and number of places before a summary is shown to the organiser. Start by naming the information or action involved, then consider what a visitor or learner needs to understand. This small planning step makes the example easier to follow and helps you notice assumptions before they become confusing.

A value is information a program can use; a variable gives that information a meaningful name. The example is synthetic and contains no real organisation, personal details or promises about services. Treat it as a learning model: adapt the structure to your own situation, and check details with the people responsible before publishing anything publicly.

Use const when the binding should not be reassigned and choose names that reveal the role of the value. A number and a string may look similar but behave differently. Try changing one detail at a time and describe what changed. When something behaves differently from what you expected, return to the goal and inspect the relevant part instead of changing several things at once.

Read a value back in a sentence and check its type before combining it with other data. A useful review asks whether the result is clear, usable and appropriate for the intended audience. Invite another person to try it when possible, and make improvements based on what they can actually understand or do.

Worked examples

Values and variables: a small example

See how values and variables can help communicate or solve a practical community task.

main.js

const eventName = 'Community clean-up'
const places = 12
console.log(`${eventName}: ${places} places`)

Practice tasks

  1. Explore values and variables

    Use the worked example for “Values and variables”. Change one small detail to suit a different synthetic community situation, then explain what you expected and how you checked whether the change still met the lesson objective.

  2. Build a JavaScript practice example

    Create a small practice result that demonstrates this objective: Store text and numbers in named variables and use them to describe a small problem. Use only synthetic information, keep the first version focused, and write down one limitation that a later version should address.

  3. Review and explain the result

    Review your “Values and variables” result as if another learner will use it without your explanation. Identify one strength, one exact point that may be unclear, and a revision that would make the result easier to understand or use.

Values and variables becomes easier when you start with a clear purpose, try one small step and check the result from the learner or community member's point of view.

Course overview