Learn Dojo - 9 Code Examples & CST Typing Practice Test

Dojo is a modern, TypeScript-first, reactive JavaScript framework for building scalable web applications. It emphasizes modularity, high performance, strong typing, and reactive widgets for enterprise-level and interactive web applications.

View all 9 Dojo code examples →

Dojo Counter Widget Dojo Counter with Step Increment Dojo Counter with Max Limit Dojo Counter with Auto-Reset Dojo Counter with History Dojo Counter with Dark Mode Only Dojo Counter with Auto-Increment Dojo Counter with Conditional Theme Dojo Full Featured Counter

Learn DOJO with Real Code Examples

Updated Nov 22, 2025

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Code Sample Descriptions

Dojo Counter Widget

import { create, tsx } from '@dojo/framework/core/vdom';
const factory = create();
const Counter = factory(function Counter() {
    const state = { count: 0, isDark: false };
    return (
        <div classes={[state.isDark ? 'dark-theme' : 'light-theme']}>
        <h2>Counter: {state.count}</h2>
        <div>
        <button onclick={() => state.count++}>+</button>
        <button onclick={() => state.count--}>-</button>
        <button onclick={() => state.count = 0}>Reset</button>
        </div>
        <button onclick={() => state.isDark = !state.isDark}>
        Switch to {state.isDark ? 'Light' : 'Dark'} Theme
        </button>
        </div>
    );
});
export default Counter;

Basic Dojo counter with dark/light theme toggle.

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Dojo Counter with Step Increment

import { create, tsx } from '@dojo/framework/core/vdom';
const factory = create();
const StepCounter = factory(function StepCounter() {
    const state = { count: 0, step: 2 };
    return (
        <div>
        <h2>Counter: {state.count}</h2>
        <button onclick={() => state.count += state.step}>+</button>
        <button onclick={() => state.count -= state.step}>-</button>
        <button onclick={() => state.count = 0}>Reset</button>
        </div>
    );
});
export default StepCounter;

Counter increments/decrements by a step value.

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Dojo Counter with Max Limit

import { create, tsx } from '@dojo/framework/core/vdom';
const factory = create();
const MaxCounter = factory(function MaxCounter() {
    const state = { count: 0, max: 5 };
    return (
        <div>
        <h2>Counter: {state.count}</h2>
        <button onclick={() => { if(state.count < state.max) state.count++; }}>+</button>
        <button onclick={() => state.count--}>-</button>
        <button onclick={() => state.count = 0}>Reset</button>
        </div>
    );
});
export default MaxCounter;

Stops incrementing after a maximum value is reached.

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Dojo Counter with Auto-Reset

import { create, tsx } from '@dojo/framework/core/vdom';
const factory = create();
const AutoResetCounter = factory(function AutoResetCounter() {
    const state = { count: 0, threshold: 10 };
    return (
        <div>
        <h2>Counter: {state.count}</h2>
        <button onclick={() => state.count = (state.count + 1 > state.threshold ? 0 : state.count + 1)}>+</button>
        <button onclick={() => state.count--}>-</button>
        <button onclick={() => state.count = 0}>Reset</button>
        </div>
    );
});
export default AutoResetCounter;

Automatically resets when counter exceeds threshold.

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Dojo Counter with History

import { create, tsx } from '@dojo/framework/core/vdom';
const factory = create();
const HistoryCounter = factory(function HistoryCounter() {
    const state = { count: 0, history: [] };
    return (
        <div>
        <h2>Counter: {state.count}</h2>
        <div>History: {state.history.join(', ')}</div>
        <button onclick={() => { state.count++; state.history.push('Increment'); }}>+</button>
        <button onclick={() => { state.count--; state.history.push('Decrement'); }}>-</button>
        <button onclick={() => { state.count=0; state.history.push('Reset'); }}>Reset</button>
        </div>
    );
});
export default HistoryCounter;

Tracks increment/decrement history.

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Dojo Counter with Dark Mode Only

import { create, tsx } from '@dojo/framework/core/vdom';
const factory = create();
const DarkModeCounter = factory(function DarkModeCounter() {
    const state = { isDark: false };
    return (
        <div classes={[state.isDark ? 'dark-theme' : 'light-theme']}>
        <h2>Counter: 0</h2>
        <button onclick={() => state.isDark = !state.isDark}>Toggle Theme</button>
        </div>
    );
});
export default DarkModeCounter;

Static counter with only theme toggle.

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Dojo Counter with Auto-Increment

import { create, tsx } from '@dojo/framework/core/vdom';
const factory = create();
const AutoIncrementCounter = factory(function AutoIncrementCounter() {
    const state = { count: 0 };
    setInterval(() => state.count++, 1000);
    return (
        <div>
        <h2>Counter: {state.count}</h2>
        </div>
    );
});
export default AutoIncrementCounter;

Automatically increments counter every second.

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Dojo Counter with Conditional Theme

import { create, tsx } from '@dojo/framework/core/vdom';
const factory = create();
const ConditionalThemeCounter = factory(function ConditionalThemeCounter() {
    const state = { count: 0 };
    return (
        <div classes={[state.count % 2 === 0 ? 'dark-theme' : 'light-theme']}>
        <h2>Counter: {state.count}</h2>
        <button onclick={() => state.count++}>+</button>
        <button onclick={() => state.count--}>-</button>
        <button onclick={() => state.count=0}>Reset</button>
        </div>
    );
});
export default ConditionalThemeCounter;

Theme changes automatically based on even/odd counter value.

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Dojo Full Featured Counter

import { create, tsx } from '@dojo/framework/core/vdom';
const factory = create();
const FullCounter = factory(function FullCounter() {
    const state = { count: 0, history: [], isDark: false, step: 2, max: 10 };
    setInterval(() => { let n = state.count + state.step; if(n>state.max) n=0; state.count=n; state.history.push('Auto Increment'); }, 1000);
    return (
        <div classes={[state.isDark ? 'dark-theme' : 'light-theme']}>
        <h2>Counter: {state.count}</h2>
        <div>History: {state.history.join(', ')}</div>
        <button onclick={() => { let n=state.count+state.step; if(n>state.max)n=0; state.count=n; state.history.push('Increment'); }}>+</button>
        <button onclick={() => { state.count-=state.step; state.history.push('Decrement'); }}>-</button>
        <button onclick={() => { state.count=0; state.history.push('Reset'); }}>Reset</button>
        <button onclick={() => state.isDark=!state.isDark}>Toggle Theme</button>
        </div>
    );
});
export default FullCounter;

Combines step increment, max limit, auto-reset, history, auto-increment, and theme toggle.

Let’s Try →

Frequently Asked Questions about Dojo

What is Dojo?

What are the primary use cases for Dojo?

Enterprise web applications. Interactive dashboards. Complex widgets and data visualization. High-performance, reactive web apps. Applications requiring strong TypeScript integration

What are the strengths of Dojo?

Highly modular and scalable. Strong TypeScript support. Optimized virtual DOM for performance. Reactive, fine-grained widget updates. Enterprise-grade architecture

What are the limitations of Dojo?

Smaller community than React or Vue. Learning curve for reactive widget system. Limited third-party ecosystem. Less beginner-friendly than simpler libraries. Requires TypeScript for full benefits

How can I practice Dojo typing speed?

CodeSpeedTest offers 9+ real Dojo code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.

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Code Sample Descriptions

Dojo Counter Widget

import { create, tsx } from '@dojo/framework/core/vdom';
const factory = create();
const Counter = factory(function Counter() {
    const state = { count: 0, isDark: false };
    return (
        <div classes={[state.isDark ? 'dark-theme' : 'light-theme']}>
        <h2>Counter: {state.count}</h2>
        <div>
        <button onclick={() => state.count++}>+</button>
        <button onclick={() => state.count--}>-</button>
        <button onclick={() => state.count = 0}>Reset</button>
        </div>
        <button onclick={() => state.isDark = !state.isDark}>
        Switch to {state.isDark ? 'Light' : 'Dark'} Theme
        </button>
        </div>
    );
});
export default Counter;

Basic Dojo counter with dark/light theme toggle.

Let’s Try →

Dojo Counter with Step Increment

import { create, tsx } from '@dojo/framework/core/vdom';
const factory = create();
const StepCounter = factory(function StepCounter() {
    const state = { count: 0, step: 2 };
    return (
        <div>
        <h2>Counter: {state.count}</h2>
        <button onclick={() => state.count += state.step}>+</button>
        <button onclick={() => state.count -= state.step}>-</button>
        <button onclick={() => state.count = 0}>Reset</button>
        </div>
    );
});
export default StepCounter;

Counter increments/decrements by a step value.

Let’s Try →

Dojo Counter with Max Limit

import { create, tsx } from '@dojo/framework/core/vdom';
const factory = create();
const MaxCounter = factory(function MaxCounter() {
    const state = { count: 0, max: 5 };
    return (
        <div>
        <h2>Counter: {state.count}</h2>
        <button onclick={() => { if(state.count < state.max) state.count++; }}>+</button>
        <button onclick={() => state.count--}>-</button>
        <button onclick={() => state.count = 0}>Reset</button>
        </div>
    );
});
export default MaxCounter;

Stops incrementing after a maximum value is reached.

Let’s Try →

Dojo Counter with Auto-Reset

import { create, tsx } from '@dojo/framework/core/vdom';
const factory = create();
const AutoResetCounter = factory(function AutoResetCounter() {
    const state = { count: 0, threshold: 10 };
    return (
        <div>
        <h2>Counter: {state.count}</h2>
        <button onclick={() => state.count = (state.count + 1 > state.threshold ? 0 : state.count + 1)}>+</button>
        <button onclick={() => state.count--}>-</button>
        <button onclick={() => state.count = 0}>Reset</button>
        </div>
    );
});
export default AutoResetCounter;

Automatically resets when counter exceeds threshold.

Let’s Try →

Dojo Counter with History

import { create, tsx } from '@dojo/framework/core/vdom';
const factory = create();
const HistoryCounter = factory(function HistoryCounter() {
    const state = { count: 0, history: [] };
    return (
        <div>
        <h2>Counter: {state.count}</h2>
        <div>History: {state.history.join(', ')}</div>
        <button onclick={() => { state.count++; state.history.push('Increment'); }}>+</button>
        <button onclick={() => { state.count--; state.history.push('Decrement'); }}>-</button>
        <button onclick={() => { state.count=0; state.history.push('Reset'); }}>Reset</button>
        </div>
    );
});
export default HistoryCounter;

Tracks increment/decrement history.

Let’s Try →

Dojo Counter with Dark Mode Only

import { create, tsx } from '@dojo/framework/core/vdom';
const factory = create();
const DarkModeCounter = factory(function DarkModeCounter() {
    const state = { isDark: false };
    return (
        <div classes={[state.isDark ? 'dark-theme' : 'light-theme']}>
        <h2>Counter: 0</h2>
        <button onclick={() => state.isDark = !state.isDark}>Toggle Theme</button>
        </div>
    );
});
export default DarkModeCounter;

Static counter with only theme toggle.

Let’s Try →

Dojo Counter with Auto-Increment

import { create, tsx } from '@dojo/framework/core/vdom';
const factory = create();
const AutoIncrementCounter = factory(function AutoIncrementCounter() {
    const state = { count: 0 };
    setInterval(() => state.count++, 1000);
    return (
        <div>
        <h2>Counter: {state.count}</h2>
        </div>
    );
});
export default AutoIncrementCounter;

Automatically increments counter every second.

Let’s Try →

Dojo Counter with Conditional Theme

import { create, tsx } from '@dojo/framework/core/vdom';
const factory = create();
const ConditionalThemeCounter = factory(function ConditionalThemeCounter() {
    const state = { count: 0 };
    return (
        <div classes={[state.count % 2 === 0 ? 'dark-theme' : 'light-theme']}>
        <h2>Counter: {state.count}</h2>
        <button onclick={() => state.count++}>+</button>
        <button onclick={() => state.count--}>-</button>
        <button onclick={() => state.count=0}>Reset</button>
        </div>
    );
});
export default ConditionalThemeCounter;

Theme changes automatically based on even/odd counter value.

Let’s Try →

Dojo Full Featured Counter

import { create, tsx } from '@dojo/framework/core/vdom';
const factory = create();
const FullCounter = factory(function FullCounter() {
    const state = { count: 0, history: [], isDark: false, step: 2, max: 10 };
    setInterval(() => { let n = state.count + state.step; if(n>state.max) n=0; state.count=n; state.history.push('Auto Increment'); }, 1000);
    return (
        <div classes={[state.isDark ? 'dark-theme' : 'light-theme']}>
        <h2>Counter: {state.count}</h2>
        <div>History: {state.history.join(', ')}</div>
        <button onclick={() => { let n=state.count+state.step; if(n>state.max)n=0; state.count=n; state.history.push('Increment'); }}>+</button>
        <button onclick={() => { state.count-=state.step; state.history.push('Decrement'); }}>-</button>
        <button onclick={() => { state.count=0; state.history.push('Reset'); }}>Reset</button>
        <button onclick={() => state.isDark=!state.isDark}>Toggle Theme</button>
        </div>
    );
});
export default FullCounter;

Combines step increment, max limit, auto-reset, history, auto-increment, and theme toggle.

Let’s Try →

Frequently Asked Questions about Dojo

What is Dojo?

What are the primary use cases for Dojo?

Enterprise web applications. Interactive dashboards. Complex widgets and data visualization. High-performance, reactive web apps. Applications requiring strong TypeScript integration

What are the strengths of Dojo?

Highly modular and scalable. Strong TypeScript support. Optimized virtual DOM for performance. Reactive, fine-grained widget updates. Enterprise-grade architecture

What are the limitations of Dojo?

Smaller community than React or Vue. Learning curve for reactive widget system. Limited third-party ecosystem. Less beginner-friendly than simpler libraries. Requires TypeScript for full benefits

How can I practice Dojo typing speed?

CodeSpeedTest offers 9+ real Dojo code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.