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WCP

Guess The Number

A number guessing game where players narrow down a target between 1 and 100 using a slider. Demonstrates reactive state with wcp-ui-state, derived values, and persistent storage for tracking a best score across sessions.

This example is a stress test. The binding expressions here are intentionally complex to push the limits of the expression parser — this is not representative of recommended usage. In practice, keep logic inside bind-event, bind-show, derive, and similar attributes simple. Move anything non-trivial (conditionals, multi-step mutations, derived calculations) into a <script> or a component method instead.

Guess My Number 1 to 100
Set the slider, then press Guess Higher — you guessed Lower — you guessed
tries
remaining
best

Code

The following example assumes that you have imported the component and set up the theme.

Guess The Number
<div class="guess-number-game">
  <wcp-ui-state id="guess-number-game-state">
    <wcp-store type="number" name="$gameSeed" value="0"></wcp-store>
    <wcp-store type="number" name="$currentGuessInput" value="50"></wcp-store>
    <wcp-store type="number" name="$lastGuess" value="0"></wcp-store>
    <wcp-store type="number" name="$attemptCount" value="0"></wcp-store>
    <wcp-store type="number" name="$minimumPossibleValue" value="1"></wcp-store>
    <wcp-store type="number" name="$maximumPossibleValue" value="100"></wcp-store>
    <wcp-store type="number" name="$bestScore" persistent value="0"></wcp-store>


    <wcp-store derive="(Date.now() % 100000 + $gameSeed * 37) % 100 + 1" name="$targetNumber"></wcp-store>
    <wcp-store derive="$lastGuess > 0 && $lastGuess === $targetNumber" name="$hasWon"></wcp-store>


    <div class="guess-number-game-header">
      <span class="guess-number-game-title">Guess My Number</span>
      <span class="guess-number-game-subtitle">1 to 100</span>
    </div>


    <div
      class="guess-number-game-feedback"
      bind-class="'guess-number-game-feedback-' + ($attemptCount === 0 ? 'idle' : ($hasWon ? 'success' : ($lastGuess < $targetNumber ? 'higher' : 'lower')))"
    >
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      <span bind-show="$attemptCount === 0">Set the slider, then press Guess</span>


      <span bind-show="$attemptCount > 0 && !$hasWon && $lastGuess < $targetNumber">
        Higher — you guessed
        <b bind-text="$lastGuess"></b>
      </span>


      <span bind-show="$attemptCount > 0 && !$hasWon && $lastGuess > $targetNumber">
        Lower — you guessed
        <b bind-text="$lastGuess"></b>
      </span>


      <span bind-show="$hasWon" bind-text="'Got it in ' + $attemptCount + ($attemptCount === 1 ? ' try' : ' tries') + '!'"></span>
    </div>


    <div class="guess-number-game-picker">
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      <span class="guess-number-game-current-value" bind-text="$currentGuessInput"></span>


      <input
        type="range"
        class="guess-number-game-slider"
        aria-label="Pick a number"
        bind-attr="min:$minimumPossibleValue; max:$maximumPossibleValue"
        bind-attr-toggle="disabled:$hasWon"
        bind-event="input:$currentGuessInput(Number(EVENT.target.value))"
        bind-prop="value:$currentGuessInput"
      />


      <div
        class="guess-number-game-range-bar"
        bind-style="
          --range-start:($minimumPossibleValue - 1) / 99 * 100;
          --range-end:($maximumPossibleValue - 1) / 99 * 100
        "
      >
        <div class="guess-number-game-range-bar-fill"></div>
      </div>


      <div class="guess-number-game-range-labels">
        <span bind-text="$minimumPossibleValue"></span>
        <span bind-text="$maximumPossibleValue"></span>
      </div>
    </div>


    <div class="guess-number-game-actions">
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      <button
        class="guess-number-game-guess-button"
        bind-attr-toggle="disabled:$hasWon"
        bind-event="
          click:
            $lastGuess($currentGuessInput),
            $attemptCount($attemptCount + 1),
            $lastGuess < $targetNumber
              ? $minimumPossibleValue($lastGuess + 1)
              : (
                  $lastGuess > $targetNumber
                    ? $maximumPossibleValue($lastGuess - 1)
                    : $bestScore($bestScore === 0 || $attemptCount < $bestScore ? $attemptCount: $bestScore)
                ),
            $lastGuess < $targetNumber
              ? $currentGuessInput($lastGuess + 1)
              : ($lastGuess > $targetNumber ? $currentGuessInput($lastGuess - 1) : null)
        "
      >
        Guess
      </button>


      <button
        class="guess-number-game-new-game-button"
        bind-event="
          click:
            $gameSeed($gameSeed + 1),
            $lastGuess(0),
            $attemptCount(0),
            $minimumPossibleValue(1),
            $maximumPossibleValue(100),
            $currentGuessInput(50)
        "
      >
        New game
      </button>
    </div>


    <div class="guess-number-game-statistics">
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      <div class="guess-number-game-statistic">
        <span class="guess-number-game-statistic-label">tries</span>
        <span class="guess-number-game-statistic-value" bind-text="$attemptCount"></span>
      </div>


      <div class="guess-number-game-statistic">
        <span class="guess-number-game-statistic-label">remaining</span>
        <span class="guess-number-game-statistic-value" bind-text="$maximumPossibleValue - $minimumPossibleValue + 1"></span>
      </div>


      <div class="guess-number-game-statistic">
        <span class="guess-number-game-statistic-label">best</span>
        <span class="guess-number-game-statistic-value" bind-text="$bestScore > 0 ? $bestScore : '—'"></span>
      </div>
    </div>
  </wcp-ui-state>
</div>


<style>
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  .guess-number-game {
    max-inline-size: 400px;
    margin: 0 auto;
    font-family: var(--sb-md-font);
    color: var(--sb-color-text);
  }


  .guess-number-game-header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    padding-block-end: 1rem;
    margin-block-end: 0.75rem;
    border-block-end: 1px solid var(--sb-color-gray-6);
  }


  .guess-number-game-title {
    font-size: var(--sb-text-xl);
    font-weight: 700;
    color: var(--sb-heading-color);
  }


  .guess-number-game-subtitle {
    font-size: var(--sb-text-sm);
    color: var(--sb-color-gray-3);
  }


  .guess-number-game-feedback {
    display: flex;
    align-items: center;
    min-block-size: 48px;
    padding: 0.5rem 1rem;
    margin-block-end: 0.75rem;
    font-size: var(--sb-text-sm);
    background: var(--sb-color-gray-7);
    border: 2px solid var(--sb-color-gray-5);
    border-radius: var(--wcp-bdr-rad-md);
    transition:
      background 0.15s,
      border-color 0.15s,
      color 0.15s;


    b {
      font-weight: 700;
      font-variant-numeric: tabular-nums;
    }
  }


  .guess-number-game-feedback-higher {
    color: var(--sb-note-text);
    background: var(--sb-note-background);
    border-color: var(--sb-note-border);
  }


  .guess-number-game-feedback-lower {
    color: var(--sb-warning-text);
    background: var(--sb-warning-background);
    border-color: var(--sb-warning-border);
  }


  .guess-number-game-feedback-success {
    font-weight: 600;
    color: var(--sb-tip-text);
    background: var(--sb-tip-background);
    border-color: var(--sb-tip-border);
  }


  .guess-number-game-picker {
    padding: 1.25rem 1rem 0.75rem;
    margin-block-end: 0.75rem;
    text-align: center;
    background: var(--sb-color-gray-7);
    border: 1px solid var(--sb-color-gray-6);
    border-radius: var(--wcp-bdr-rad-md);
  }


  .guess-number-game-current-value {
    display: block;
    margin-block-end: 1rem;
    font-size: var(--sb-text-5xl);
    font-weight: 800;
    font-variant-numeric: tabular-nums;
    line-height: 1;
    color: var(--sb-color-accent-high);
    letter-spacing: -0.03em;
  }


  .guess-number-game-slider {
    display: block;
    inline-size: 99%;
    accent-color: var(--sb-color-accent);
    cursor: pointer;


    &:disabled {
      cursor: not-allowed;
      opacity: 0.35;
    }
  }


  .guess-number-game-range-bar {
    position: relative;
    block-size: 6px;
    margin-block: 2em 0.4rem;
    margin-inline: 3px;
    overflow: hidden;
    background: var(--sb-color-gray-5);
    border-radius: 3px;
  }


  .guess-number-game-range-bar-fill {
    position: absolute;
    inset: 0;
    inset-inline: calc(var(--range-start, 0) * 1%) calc((100 - var(--range-end, 100)) * 1%);
    background: var(--sb-color-accent);
    transition:
      left 0.15s ease,
      right 0.15s ease;
  }


  .guess-number-game-range-labels {
    display: flex;
    justify-content: space-between;
    font-size: var(--sb-text-xs);
    font-variant-numeric: tabular-nums;
    color: var(--sb-color-gray-3);
  }


  .guess-number-game-actions {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 0.5rem;
    margin-block-end: 0.75rem;
  }


  .guess-number-game-guess-button,
  .guess-number-game-new-game-button {
    padding: 0.75rem 1.25rem;
    font-family: var(--sb-md-font);
    font-size: var(--sb-text-sm);
    font-weight: 600;
    letter-spacing: 0.03em;
    cursor: pointer;
    border: none;
    border-radius: var(--wcp-bdr-rad-md);
    transition:
      opacity 0.1s,
      background 0.1s;
  }


  .guess-number-game-guess-button {
    color: var(--wcp-primary-content);
    background: var(--sb-color-accent);


    &:disabled {
      cursor: default;
      opacity: 0.3;
    }


    &:hover:not(:disabled) {
      opacity: 0.85;
    }
  }


  .guess-number-game-new-game-button {
    color: var(--sb-color-gray-1);
    background: var(--sb-color-gray-6);
    border: 1px solid var(--sb-color-gray-5);


    &:hover {
      background: var(--sb-color-gray-5);
    }
  }


  .guess-number-game-statistics {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    overflow: hidden;
    background: var(--sb-color-gray-5);
    border-radius: var(--wcp-bdr-rad-md);
  }


  .guess-number-game-statistic {
    display: flex;
    flex-direction: column;
    gap: 0.1rem;
    align-items: center;
    padding: 0.625rem 0.5rem;
    background: var(--sb-color-gray-7);
  }


  .guess-number-game-statistic-label {
    font-size: var(--sb-text-2xs);
    color: var(--sb-color-gray-3);
    text-transform: uppercase;
    letter-spacing: 0.1em;
  }


  .guess-number-game-statistic-value {
    font-size: var(--sb-text-xl);
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    color: var(--sb-color-gray-1);
  }
</style>