Define component parameter contracts — Discover and trace

PART II

Instruction & guided example

Describe width as a contract rather than a number

A component parameter contract states representation, meaning, allowed range, defaults and update behavior. A correct-looking configuration can violate any one of these. Keep the public contract independent from the native hosts private implementation; proposed WS object notation does not validate inputs by itself.

A Badge component accepts width in logical units, integer40..200 inclusive. Width is required; no default exists. Supplied requests are40,120,201 and"120".

Worked reasoning: Forty and120 satisfy representation and range.201 is an integer outside range;"120" is text and fails representation. A diagnostic should identify those different causes rather than silently coercing both.

Failed alternative: Calling every numeric-looking value valid loses the explicit type boundary and accepts a string the host never promised to parse.

Worked reasoning and supplied artifact

width40:integer+in range ->accept
width120:integer+in range ->accept
width201:integer+too large ->reject range
width"120":text ->reject type

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

width40:integer+in range ->accept
Read this key/value within its containing object. State which parent owns it and the narrow visible behavior it configures.
width120:integer+in range ->accept
Read this key/value within its containing object. State which parent owns it and the narrow visible behavior it configures.
width201:integer+too large ->reject range
Read this key/value within its containing object. State which parent owns it and the narrow visible behavior it configures.
width"120":text ->reject type
Read this key/value within its containing object. State which parent owns it and the narrow visible behavior it configures.

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: Accessible service console. Build a small, understandable change around define component parameter contracts.

Define a Height parameter integer20..80 and classify20,80,81 and"20".

What to produce

A parameter contract plus type/range diagnostic table.

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?

Representation validation precedes checking the integer bounds; the host supplies no string coercion.

Calling every numeric-looking value valid loses the explicit type boundary and accepts a string the host never promised to parse.

Original learning-path task and reference

In a strategy simulation analytics tool, demonstrate define component parameter contracts. Read the source-grounded example and predict its observable behavior before making changes. Include .ws source and a host-resource contract; compare at least one normal case and one edge case.

import wuix.widget.button;
import wuix.layout;
domain Login {
    const screen = {
        layout: { type: "column", padding: [24, 32], gap: 16 },
        components: [{ type: "text", value: "Welcome back" }]
    };
    fnc show() -> void {
        wuix.mount("main", screen);
    }
}

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.

Why does"120" fail?It is text under an integer contractIt exceeds200Its spelling is too short

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.

Describe width as a contract rather than a number
Define a Height parameter integer20..80 and classify20,80,81 and"20".
Separate source-backed behavior, host requirements and untested predictions.

One small recap task

Separate representation, unit and domain in a public parameter description.

Your recap

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