)
}
}
)
(
}
{
)
)
(
)
(
(
{
}
)
(
)
}
)
)
{
(
(
)
)
}
)
(
}

Enum Shorthand

  1. const toEnum = (...values) =>
  2.   Object.freeze(values.reduce((acc, curr) => {
  3.     acc[curr] = curr
  4.     return acc
  5.   }, {}))
  6.  
  7. const Graphics = toEnum(
  8.   'circle', 
  9.   'rect', 
  10.   'triangle'
  11. )
  12.  
  13. console.log(Graphics.circle)

I sure dislike fake enums in js. Something like this at least dries things up – but still, yuk! 😀

React Vanilla

  1. <style>*{ font-family: sans-serif; margin-bottoM: .5em;}</style>
  2.  
  3. <h3>TODO</h3>
  4. <ul id=todos></ul>
  5. <label>What needs to be done?<br>
  6.   <input id=todo onchange="newTodo()"/><br>
  7. </label>
  8. <button id=add onclick="newTodo()">Add #1</button>
  9.  
  10. <script>
  11.   let count = 1
  12.   function newTodo() {
  13.     if (todo.value.length > 0) {
  14.       todos.innerHTML += `<li>${todo.value}</li>`
  15.       todo.value = ''
  16.       add.innerText = `Add #${++count}`
  17.     }
  18.   }
  19. </script>

I don’t really like React… Don’t get me wrong, I don’t mind it and I even kind of like using it – there’s something fun about it… But it’s surprising to me that UI work is still so bulky… I think React and most other UI libraries are overly complex… Every now and then I do evil style vanilla js versions of the React homepage examples as a sort of rebellion 😀 This is the React version of the above snippet:

  1. class TodoApp extends React.Component {
  2.   constructor(props) {
  3.     super(props);
  4.     this.state = { items: [], text: '' };
  5.     this.handleChange = this.handleChange.bind(this);
  6.     this.handleSubmit = this.handleSubmit.bind(this);
  7.   }
  8.  
  9.   render() {
  10.     return (
  11.       <div>
  12.         <h3>TODO</h3>
  13.         <TodoList items={this.state.items} />
  14.         <form onSubmit={this.handleSubmit}>
  15.           <label htmlFor="new-todo">
  16.             What needs to be done?
  17.           </label>
  18.           <input
  19.             id="new-todo"
  20.             onChange={this.handleChange}
  21.             value={this.state.text}
  22.           />
  23.           <button>
  24.             Add #{this.state.items.length + 1}
  25.           </button>
  26.         </form>
  27.       </div>
  28.     );
  29.   }
  30.  
  31.   handleChange(e) {
  32.     this.setState({ text: e.target.value });
  33.   }
  34.  
  35.   handleSubmit(e) {
  36.     e.preventDefault();
  37.     if (this.state.text.length === 0) {
  38.       return;
  39.     }
  40.     const newItem = {
  41.       text: this.state.text,
  42.       id: Date.now()
  43.     };
  44.     this.setState(state => ({
  45.       items: state.items.concat(newItem),
  46.       text: ''
  47.     }));
  48.   }
  49. }
  50.  
  51. class TodoList extends React.Component {
  52.   render() {
  53.     return (
  54.       <ul>
  55.         {this.props.items.map(item => (
  56.           <li key={item.id}>{item.text}</li>
  57.         ))}
  58.       </ul>
  59.     );
  60.   }
  61. }
  62.  
  63. root.render(<TodoApp />);
// dom // globals // hacks // humor // ui

C Style Print with Console.log

  1. console.log('print: %s %i %f %o %s', 'two', 1.4, 1.6, { cool: 321 }, [3, 2, 1]);

outputs: print: two 1 1.6 {cool: 321} 3,2,1

Notice how we are casting a float to an integer and an array to a string in the above example. I personally don’t use this much in javascript, but for someone coming from a C/C-like language this should look familiar and could be very useful.

Interview with Senior JS Developer in 2022

This is extremely good.

snippet.zone ~ 2021-24 /// {s/z}