기본 콘텐츠로 건너뛰기

JS 6.9 task 4 what the fuck is this / Throttle decorator

<HTML>
  <body>
  </body>
   <script>
   function f(a) {
     console.log(a)
   };

   // f1000 passes calls to f at maximum once per 1000 ms
   let f1000 = throttle(f, 1000);


function throttle(update, ms){
    let isThrottled = false,
    savedArgs,
    savedThis; //context can be saved in let

    function wrapper(){
      if(isThrottled) { //if throttled is true, save latest call
        savedArgs = arguments;
        savedThis = this;
        return;
      }

      update.apply(this,arguments);
      //runs and book the next call
      isThrottled = true;

      setTimeout(function() {
        //initiate the flag object and let wrapper runs again
        isThrottled = false;
        if(savedArgs) {
          wrapper.apply(savedThis, savedArgs);
          //calling the whole function wrapper makes the latest call's infos to be saved
          savedArgs = savedThis = null;
        }
      }, ms);
    }
    return wrapper;
}
   f1000(1); // shows 1
   f1000(2); // (throttling, 1000ms not out yet)
   f1000(3); // (throttling, 1000ms not out yet)
   </script>
</HTML>

라벨:

댓글

댓글 쓰기

이 블로그의 인기 게시물

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("*&
댓글 쓰기
자세한 내용 보기

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? -->
댓글 쓰기
자세한 내용 보기

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.
댓글 쓰기
자세한 내용 보기