Advanced-JavaScript-With-Projects/Advanced Function.html at main · marleyDip/Advanced-JavaScript-With-Projects · GitHub

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<!DOCTYPE html>
<html lang="en">
  <head>
    <title>Advanced Function Exercise</title>
    <style>
      .btn-subscribe {
        font-weight: 15px;
        height: 40px;
        width: 80px;
        background-color: rgb(217, 17, 17);
        color: white;
        border: none;
        border-radius: 5px;
        cursor: pointer;
      }

      .js-size-double {
        font-size: 30px;
        height: 80px;
        width: 160px;
      }
    </style>
  </head>
  <body>
    <h3>
      Create a variable multiply and assign a function to this variable that
      multiplies two numbers. call this method from the variable
    </h3>
    <h4 id="arrowFunction"></h4>

    <h3>
      create a function runTwice that takes a function as a parameter and then
      runs that method twice (CallBack Function)
    </h3>
    <h4 id="callbackFunction"></h4>

    <h3>
      Create a button which should grow double in size on clicking after 2
      seconds
    </h3>

    <!-- short trick, when call setTimeout..no need to round bracket or parenthesis after function name bcz setTimeout upon call the method -->

    <!-- <button class="btn-subscribe" onclick="setTimeout(doubleTheSize, 2000)" ;>
      Subscribe
    </button> -->

    <button class="btn-subscribe">Subscribe</button>

    <h3 id="forEach">
      Create a function that sums an array of numbers. Do this using forEach
      loop
    </h3>
    <h4 id="array"></h4>
    <h4 id="result"></h4>

    <h3>
      Create a function that takes an array of numbers and return their squares
      using map function
    </h3>
    <h4 id="map"></h4>

    <script>
      let multiply = (num1, num2) => num1 * num2;

      let num = 5,
        num2 = 6;

      document.querySelector(
        "#arrowFunction"
      ).innerText = ` => Multiplication of ${num} & ${num2} is ${multiply(
        num,
        num2
      )}`;

      console.log(multiply(5, 6));

      let printGreeting = () => console.log("Hello, Mr. Sofian");

      let printGreeting1 = () => {
        let element = document.querySelector("#callbackFunction");
        element.innerText += "=> Hello, Mr. Sofian\n";
      };

      let runTwice = (inputFunction) => {
        inputFunction();
        inputFunction();
      };

      runTwice(printGreeting);
      runTwice(printGreeting1);

      let buttonElement = document.querySelector(".btn-subscribe");

      buttonElement.addEventListener("click", () => {
        setTimeout(() => {
          buttonElement.classList.add("js-size-double");
        }, 2000);
      });

      /* buttonElement.addEventListener("click", (event) =>
        setTimeout(doubleTheSize, 2000)
      ); */

      function doubleTheSize() {
        let buttonElement = document.querySelector(".btn-subscribe");
        buttonElement.classList.add("js-size-double");
      }

      let arr = [10, 20, 30, 40, 50];
      let sum = 0;

      arr.forEach((num) => {
        sum += num;
      });

      //   let forEachMethod = document.querySelector("#forEach");
      //   forEachMethod.innerText = `Sum is ${sum}`;

      console.log(sum);
      console.log(arr);

      function sumOfArray(numbers) {
        let sum = 0;

        numbers.forEach((num) => {
          sum += num;
        });

        return sum;
      }

      let array = [10, 20, 30, 40, 50];
      let total = sumOfArray(array);

      document.querySelector("#array").innerText = `Array = (${
        array.length
      }) [${array.join(", ")}]`;

      document.querySelector("#result").innerText = `=> Sum is ${total}`;

      // forEach doesn't return anything; its just takes once all values for each array elements using callback function

      let squares = array.map((num) => num * num);

      document.querySelector("#map").innerText = `=> Array of Squares (${
        squares.length
      }) [${squares.join(", ")}]`;
      console.log(squares);
    </script>
  </body>
</html>