Propose a host-neutral application contract — Connect the previous skills

PART I

Warm-up

Reconnect with a useful idea before starting propose a host-neutral application contract. 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.

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

PART II

Instruction & guided example

Connect readiness to the first service request carefully

A host-neutral application contract describes user goals, supplied data, services, permissions, lifetime and evidence before choosing environment-specific integrations. The source’s Application constructor and app.ready callback are illustrative host inputs, not builtins supplied by this school. A Willow learner can reuse precise state reasoning while keeping proposed .ws and conceptual native services distinct from implemented .w.

A future planner wants to read inventory after app.ready. Sample lifecycle map: application configured → host reports readiness according to its contract → callback requests inventory → permission and availability checks still apply. Readiness may mean the window exists; it must not be assumed to mean every data service is authorized and ready unless the host says so.

The original callback only requests console.log("Ready"). Expanding it into inventory work changes the service contract. Do not infer ordering, concurrency or cancellation signatures from the existence of the event key. List the exact readiness guarantee needed by the first request.

Worked reasoning and supplied artifact

// Worked contract artifact:
// A future planner wants to read inventory after app.ready. Sample lifecycle map: application configured → host reports readiness according to its contract → callback requests inventory → permission and availability checks still apply. Readiness may mean the window exists; it must not be assumed to mean every data service is authorized and ready unless the host says so.

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.

Try the guided change

Compare the original logging callback responsibility with the proposed inventory-start responsibility.

• 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.

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.

PART IV

Independent practice

Project context: Independent WillowScript application. Build a small, understandable change around propose a host-neutral application contract.

Plan a schedule viewer that starts a read after readiness. State the required readiness condition, separate read authorization and the desired outcome if data remains unavailable.

What to produce

A readiness/service dependency diagram and explicit guarantees needed at each boundary.

• 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.

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.

import wuix.widget;
import app;
domain Workspace {
    const application = Application({
        name: "Workspace",
        window: { title: "Dashboard", size: [1280, 800] },
        events: {
            "app.ready": fnc() -> void { console.log("Ready"); }
        }
    });
}

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.

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.

• Connect readiness to the first service request carefully
• Compare the original logging callback responsibility with the proposed inventory-start responsibility.
• Separate source-backed behavior, host requirements and untested predictions.

One small recap task

Compare the original logging callback responsibility with the proposed inventory-start responsibility.

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