Model ordered lists, nested settings, and typed event configuration — Build the smallest useful slice

PART I

Warm-up

Reconnect with a useful idea before starting model ordered lists, nested settings, and typed event configuration. In one or two sentences, describe the input, output or host boundary from the previous exercise that this lesson builds on. If you are arriving directly, skim the worked example first; there is no locked prerequisite.

Recall note

A rough note is enough. You can revise it after the example.

PART II

Instruction & guided example

Build a no-argument callback honestly

Typed event configuration must connect a declared callback contract to the actual delivery shape. Registration stores a response; delivery supplies inputs later. Shared fnc vocabulary does not make Event, navigator or an arbitrary event field a builtin. Treat every such name as an explicit exercise-host dependency.

Host click contract is fnc()->void. The current selectedId is an explicitly supplied configuration value7, stable for this exercise. The response requests review of7; no Event argument is delivered.

Worked reasoning: The no-argument response uses the declared selected value. It need not invent event.selectedId. If selection becomes dynamic, this static-value exercise is insufficient until capture/read semantics are explicitly specified.

Failed alternative: Adding an Event parameter because other controls use one breaks agreement with this clicks actual invocation shape.

Worked reasoning and supplied artifact

// Proposed callback form; selectedId is supplied input
const selectedId: i32 = 7;
const response = fnc() -> void {
    // Host request:review selectedId7
};
// Contract:selection does not change during this case

Illustrative example from the proposed WillowScript design. The language and WUIX/WMATH/WDB/WAUDIO/WTMP services are not implemented in the supplied source. This site has no interpreter, VM or native host and does not execute or certify the snippet.

Walk through the example, one line at a time

// Proposed callback form; selectedId is supplied input
This comment explains intent for a reader. It is not an operation and should not be counted as an executed result.
const selectedId: i32 = 7;
Name a value that this example keeps stable. Inspect the right-hand side for the value or configuration being bound.
const response = fnc() -> void {
Name a value that this example keeps stable. Inspect the right-hand side for the value or configuration being bound.
// Host request:review selectedId7
This comment explains intent for a reader. It is not an operation and should not be counted as an executed result.
};
Close the nested block or value begun earlier. Match it to its opening boundary to keep the structure readable.
// Contract:selection does not change during this case
This comment explains intent for a reader. It is not an operation and should not be counted as an executed result.

Try the guided change

Reconstruct the supplied worked case first: list its inputs, intermediate decisions and final artifact. Compare each row with the explanation and identify exactly where the rejected alternative fails. Then use the changed inputs in Part IV for independent work.

Write the supplied inputs and initial state before following the example.
Reconstruct each intermediate calculation or host decision, then compare with the worked artifact.
Explain why the contrasting alternative fails before attempting the changed inputs in Part IV.

Prediction or guided notes

PART III

Take a breather

Step back after the guided example. Look away from the screen, stretch, or reread your prediction. This is an optional learning pause, not a timer or an assessment gate.

When you return, try to name the lesson’s key idea without copying its wording. If that feels difficult, return to Part II and trace one line rather than restarting the entire lesson.

Your drafts remain here. Continue whenever you are ready.

PART IV

Independent practice

Project context: Reusable configuration workspace. Build a small, understandable change around model ordered lists, nested settings, and typed event configuration.

Describe a no-argument Open report callback using supplied reportId12. State the additional contract needed before allowing report selection to change.

What to produce

A callback input contract, static dependency list and unresolved dynamic-selection requirement.

State the intended behavior in a sentence before editing.
Use only source-backed syntax and the host services whose contract you have been given.
Record a normal case and a boundary or unavailable-resource case.
Label hand predictions separately from anything actually measured in a supplied toolchain.

Your .ws practice draft

Syntax colors are a reading aid, not a compiler. The line you are editing stays uncolored until you move to a different line; capitalization is never changed. Drafts stay on this browser and code is not executed.

Need a hint?

The supplied no-argument signature controls delivery; callback naming cannot add host inputs.

Adding an Event parameter because other controls use one breaks agreement with this clicks actual invocation shape.

Original learning-path task and reference

In a strategy simulation analytics tool, demonstrate model ordered lists, nested settings, and typed event configuration. Create the smallest .ws integration that demonstrates the section contract. Include .ws source and a host-resource contract; compare at least one normal case and one edge case.

import wuix.widget;
const button = widget.Button({
    text: "Continue",
    events: {
        click: fnc() -> void {
            navigator.open("dashboard");
        }
    }
});

Where the original task needs a host API that is not supplied here, write the contract and predictions. Do not invent a runtime result.

PART V

Self-check

Use this check to notice what to revisit. It does not award a private course grade, block another page or claim to verify compiled code. Every answer has a learning explanation.

Does this click provide an Event argument?NoYes, because it is a clickYes, if a parameter is named event

Explain a normal or boundary case

You may keep exploring even if you are unsure. Use the hint, compare the trace, and revise your explanation.

PART VI

Recap & small task

Bring the idea back to the mod feature you are building. A useful recap connects the mechanism to a decision you can make in your own code.

Build a no-argument callback honestly
Describe a no-argument Open report callback using supplied reportId12. State the additional contract needed before allowing report selection to change.
Separate source-backed behavior, host requirements and untested predictions.

One small recap task

Use the declared signature before choosing a payload field.

Your recap

This marks your personal practice record only. It is not a certification or an official workspace assessment.