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DOM : Image Gallery HTML

<HTML>
<head>
  <title>Gallery</title>
  <link rel="stylesheet" href="gallery.css"></link>
  <meta charset="utf-8">
</head>
<body>
  <p><img id="largeImg" src="https://en.js.cx/gallery/img1-lg.jpg" alt="Large image"></p>

<ul id="thumbs">
    <ul>
      <a href="https://en.js.cx/gallery/img2-lg.jpg" title="Image 2"><img src="https://en.js.cx/gallery/img2-lg.jpg"></a>
    </ul>
    <ul>
      <a href="https://en.js.cx/gallery/img3-lg.jpg" title="Image 3"><img src="https://en.js.cx/gallery/img3-lg.jpg"></a>
    </ul>
    <ul>
      <a href="https://en.js.cx/gallery/img4-lg.jpg" title="Image 4"><img src="https://en.js.cx/gallery/img4-lg.jpg"></a>
    </ul>
    <ul>
      <a href="https://en.js.cx/gallery/img5-lg.jpg" title="Image 5"><img src="https://en.js.cx/gallery/img5-lg.jpg"></a>
    </ul>
    <ul>
      <a href="https://en.js.cx/gallery/img6-lg.jpg" title="Image 6"><img src="https://en.js.cx/gallery/img6-lg.jpg"></a>
    </ul>
</ul>

/*In the example, inner list was consist of li
but it didnt align the thumbnails horizontally, looked like a stairs by hierarchy
I changed it to be ul, now looks horizontal. ^ㅅ^ I like this task much*/
<script>
  thumbs.onclick = function(event) {
    let thumbnail = event.target.closest('a');
    //get the event which in inside the a or exactly is a
    if(!thumbnail) return; //if its not, 돌아가라!
    showThumbmail(thumbnail.href, thumbnail.title);
    event.preventDefault();
    //default likes to the origin page of the image source, prevent it
    function showThumbmail(href, title){
      largeImg.src = href;
      largeImg.alt = title;
      /*the tag can be selected by variable name in JS
        and the attributes also can be changed ^ㅅ^
        easy science!
      */
    }
  }
</script>
</body>

</HTML>

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JS 5.5 task6 Create an extendable calculator

<HTML>   <body>   </body>   <script> function Calculator() {   let methods = {     "-" : (a, b) => a - b,     "+" : (a, b) => a + b   };   //methods is an object which keeps key for operators   //and value to return the actual operation values   //each returns the result of operation that key(operator) does   this.calculate = function (str){     //calculate is one element in the function Calculator     //it takes the string and returns the value     //in the function element list is delimeted by , not ;     let split = str.split(" "),     a = +split[0],     op = split[1],     b = split [2]     if(!methods[op] || isNaN(a) || isNaN(b)) {       return NaN; // error handling     }     return methods[op](a,b);   }   this.addMethod = function(name, func){     methods[name] = func;     //this is how to add new key and ele to object   } } let powerCalc = new Calculator; powerCalc.addMethod("*&
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JS 5.7 task5 Store read dates

<HTML>   <body>   </body>    <script>    let messages = [        {text: "Hello", from: "John"},        {text: "How goes?", from: "John"},        {text: "See you soon", from: "Alice"}    ];    let readMap = new WeakMap();    alert(readMap.size);    readMap.set(messages[0], new Date(2019, 3, 5));   </script> </HTML> <!-- task4 needed weakSet to save simply readmessage, this task needs to save THE TIME IT WAS READ along with the message itself the message out of the set or map means it hasn't been read I kinda feel good and bad at the same time to happen to read the solution but I do get to think more about the difference with tasks and be more available to understand the main contents so I think, its good? -->
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How to set base url when deployed in Heroku? : base url and axios

https://stackoverflow.com/questions/47164330/axios-api-calls-in-heroku/47165888 baseUrl = process.env.baseURL || "http://localhost:5000" Even more stable way https://stackoverflow.com/questions/52129849/how-to-get-the-base-url-variable-on-a-deployed-heroku-node-app const production  = 'https://examplePage.com'; const development = 'http://localhost:3000/'; const url = (process.env.NODE_ENV ? production : development); process.env.NODE_ENV will resolve to undefined if you are running on localhost production mode. and return production if you have deployed the app production mode.
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