code-boxx/0-JS-SYNC-ASYNC.MD

## 0-JS-SYNC-ASYNC.MD

      
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              0-JS-SYNC-ASYNC.MD
            
          
    SYNCHRONOUS VS ASYNCHRONOUS JAVASCRIPT

https://code-boxx.com/synchronous-asynchronous-javascript/
LICENSE

Copyright by Code Boxx
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.****

  
## 1-sync.html
<!DOCTYPE html>
<html>
  <head>
    <title>Synchronous Javascript</title>
    <script>
    // (A) ADD FUNCTION
    function add (first, second) {
      return first + second;
    }

    // (B) MULTIPLY FUNCTION
    function multiply (first, second) {
      return first * second;
    }

    // (C) ADD, THEN MULTIPLY
    var result = multiply(add(2, 3), 5);
    console.log(result); // 25
    </script>
  </head>
  <body></body>
</html>

## 2a-async.html
<!DOCTYPE html>
<html>
  <head>
    <title>Asynchronous Javascript</title>
    <script>
    // (A) ASYNC ADD
    async function add (first, second) {
      return first + second;
    }

    // (B) RUN!
    var added = add(2, 3);
    console.log(added); // PROMISE
    </script>
  </head>
  <body></body>
</html>

## 2b-resolve-promise.html
<!DOCTYPE html>
<html>
  <head>
    <title>Asynchronous Javascript</title>
    <script>
    // (A) ASYNC ADD
    async function add (first, second) {
      return first + second;
    }

    // (B) RUN ASYNC FUNCTION
    add(2, 3)

    // (C) THEN RESOLVE RESULT ON COMPLETE
    .then(result => {
      console.log(result);
      // DO SOMETHING
    })

    // (D) OPTIONAL - CATCH ERRORS
    .catch(err => console.log(error))

    // (E) OPTIONAL - FINALLY
    .finally(() => console.log("Finally"));
    </script>
  </head>
  <body></body>
</html>

## 2c-async-chain.html
<!DOCTYPE html>
<html>
  <head>
    <title>Asynchronous Chain Javascript</title>
    <script>
    // (A) ADD FUNCTION
    async function add (first, second) {
      return first + second;
    }

    // (B) MULTIPLY FUNCTION
    async function multiply (first, second) {
      return first * second;
    }

    // (X) BAD!
    var result = multiply(add(2, 3), 5);
    console.log(result); // PROMISE - NAN

    // (C) ASYNC CHAIN
    add(2,3)
    .then(added => {
      console.log(added); // 5
      multiply(added, 5)
      .then(multiplied => console.log(multiplied)); // 25
    });
    </script>
  </head>
  <body></body>
</html>

## 2d-await.html
<!DOCTYPE html>
<html>
  <head>
    <title>Asynchronous Chain Javascript</title>
    <script>
    // (A) ADD FUNCTION
    async function add (first, second) {
      return first + second;
    }

    // (B) MULTIPLY FUNCTION
    async function multiply (first, second) {
      return first * second;
    }

    // (C) AWAIT
    async function addmultiply () {
      var result = await add(2, 3);
      result = await multiply(result, 5);
      console.log(result); // 25
    }
    addmultiply();
    </script>
  </head>
  <body></body>
</html>
	<!DOCTYPE html>
	<html>
	<head>
	<title>Synchronous Javascript</title>
	<script>
	// (A) ADD FUNCTION
	function add (first, second) {
	return first + second;
	}

	// (B) MULTIPLY FUNCTION
	function multiply (first, second) {
	return first * second;
	}

	// (C) ADD, THEN MULTIPLY
	var result = multiply(add(2, 3), 5);
	console.log(result); // 25
	</script>
	</head>
	<body></body>
	</html>