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Web Development · module 9 of 13

Modern JavaScript Patterns

Apply array methods, destructuring, spread syntax, classes, modules, reusable data transformations, and clean boundaries.

Course map
destructure — take pieces outconst user = { name, age }const { name } = user;name is now its own variablespread — copy pieces in{ ...user, age: 31 }a new object — user is untouchedlater keys win, so age is replacedThis pairing is why modern JavaScript rarely mutates. You read out what you need, then build a newvalue with the change, instead of editing the original in place.The copy is shallow: nested objects are shared, not cloned — a common source of surprise bugs.
Modern JavaScript Patterns — the idea in one picture

What this module covers

5 steps · Web Development

  1. Step 1. Lesson: Modern JavaScript Patterns

    Apply array methods, destructuring, spread syntax, classes, modules, reusable data transformations, and clean boundaries. Learning objectives - Recognize when modern javascript patterns is the right tool. - Explain the role of map, filter, export. - Build a small working example before combining it with a larger interface. - Identify one accessibility, maintainability, or error-handling improvement. Read the example, predict what it will do, then complete the small change described in the check question.

    Apply array methods, destructuring, spread syntax, classes, modules, reusable data transformations, and clean boundaries. In Web Lab, make the state/interaction visible in the UI so completion is easy to verify.

    Check yourself: [Web Lab] Use the example to demonstrate modern javascript patterns.

  2. Step 2. Quiz: Modern JavaScript Patterns

    Check your understanding of Modern JavaScript Patterns.

    map returns a new array containing one transformed result for each input item. In Web Lab, make the state/interaction visible in the UI so completion is easy to verify.

    Check yourself: [Web Lab] Complete the knowledge check.

  3. Step 3. Exercise: Modern JavaScript Patterns

    Transform a product collection with filter, map, reduce, destructuring, and immutable object updates.

    This exercise turns the Modern JavaScript Patterns lesson into a working code change. In Web Lab, make the state/interaction visible in the UI so completion is easy to verify.

    Check yourself: [Web Lab] Does the solution use map and filter and export?

  4. Step 4. Review lab: Explain & improve Modern JavaScript Patterns

    Rebuild the exercise without copying the solution. Then improve it in two ways: make the code easier to understand and add one useful edge case, responsive behavior, accessibility improvement, or error state. Finally, write a short explanation of how map, filter, export work together.

    Rebuilding from memory and improving an edge case turns recognition into durable skill. In Web Lab, make the state/interaction visible in the UI so completion is easy to verify.

    Check yourself: [Web Lab] Does the improved version still use map, filter, export clearly?

  5. Step 5. Mini project: Modern JavaScript Patterns

    Build a modular expense tracker with model classes, imported helpers, filtering, totals, and persistent JSON data.

    The mini project combines the module lesson, quiz, and exercise into one portfolio-ready result. In Web Lab, make the state/interaction visible in the UI so completion is easy to verify.

    Check yourself: [Web Lab] Does the project apply the module's modern javascript patterns skills?

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