01219245/javascript1/tutorial1 - ประวัติรุ่นแก้ไข

Jittat: /* A dynamic language */

2016-01-25T17:20:49Z

A dynamic language

2016-01-25T07:39:22Z

Showing round numbers

2016-01-25T07:38:42Z

Random numbers

2016-01-25T07:37:42Z

Functions

2016-01-25T07:35:22Z

How to run a JavaScript program?

2014-01-11T08:00:50Z

2014-01-10T06:38:52Z

2014-01-10T06:38:21Z

2014-01-10T06:02:40Z

Functions

2014-01-10T03:16:28Z

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	=== A dynamic language ===		=== A dynamic language ===
		+
		+	: ''Notes: In this part, you will not write any code, but it is a discussion on the basic of dynamic language.''

	In Java, you declare a variable with its '''type'''. For example, you may say <tt>int sol;</tt>. However, in JavaScript, we do not specify variable's type; we only use keyword '''<tt>var</tt>''' to declare a local variable. It is not that data in JavaScript do not have types; they do. But the type information is in each piece of the data itself, not in the variable that keeps it.		In Java, you declare a variable with its '''type'''. For example, you may say <tt>int sol;</tt>. However, in JavaScript, we do not specify variable's type; we only use keyword '''<tt>var</tt>''' to declare a local variable. It is not that data in JavaScript do not have types; they do. But the type information is in each piece of the data itself, not in the variable that keeps it.

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	Then, add a counter to the main program and we should be done.		Then, add a counter to the main program and we should be done.
		+
		+	{{Callta\|5. Show the complete game to the TA.}}

	=== A better function ===		=== A better function ===

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	Let's play the game a few times to celebrate our first JavaScript program.		Let's play the game a few times to celebrate our first JavaScript program.
		+
		+	{{Callta\|4. Show the game to the TA.}}

	== Showing round numbers ==		== Showing round numbers ==

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 If you paste the above program into JSFiddle and click Run, you'll see nothing, but there won't be any error message in the JavaScript console.
 === alert and prompt ===
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 You can click Run again, and you should be able to play with it for a bit now.
 === Side Notes: type conversion ===

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	'''Notes:''' ''How to look at JavaScript console?'' In Firefox, Menu -> Web Developer -> Web Console. In Google Chrome, Menu -> Tools -> JavaScript Console. In Safari, TBA. In IE, TBA.		'''Notes:''' ''How to look at JavaScript console?'' In Firefox, Menu -> Web Developer -> Web Console. In Google Chrome, Menu -> Tools -> JavaScript Console. In Safari, TBA. In IE, TBA.
		+
		+	{{Callta\|1. Show the broken program and the error console to the TA.}}

	== Functions ==		== Functions ==

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 ** [http://www.youtube.com/watch?v=ZGYqoy547eU Part 1] - introduction, variables, control flows.
 ** [http://www.youtube.com/watch?v=80v0EHy3Ohw Part 2] - functions, I/O with alert() and prompt()
-** Part 3 - how to random
+** [http://www.youtube.com/watch?v=hNc_qOm6FJo Part 3] - how to generate random numbers
 == Let's get started ==

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	55		55
	Great! That's correct.		Great! That's correct.
		+
		+	=== YouTube Clips ===
		+
		+	* [http://www.youtube.com/watch?v=ZGYqoy547eU Part 1] - introduction, variables, control flows.
		+	* [http://www.youtube.com/watch?v=80v0EHy3Ohw Part 2] - functions, I/O with alert() and prompt()
		+	* Part 3 - how to random

	== Let's get started ==		== Let's get started ==

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	You can click Run again, and you should be able to play with it for a bit now.		You can click Run again, and you should be able to play with it for a bit now.
		+
		+	=== Side Notes: type conversion ===
		+
		+	In fact, if you do not use <tt>parseInt</tt> in <tt>readGuess</tt>, the program still runs correctly. This is because in JavaScript, when you use '''<tt>==</tt>''' to compare two values, JavaScript tries to convert the values before performing the comparison, so
		+
		+	10 == '10' # is true
		+
		+	We usually don't want this, because automatic conversion might cause subtle errors later on. To avoid this, we can use the '''<tt>===</tt>''' operator to compare. Like this:
		+
		+	10 === 10 # is true
		+	10 === '10' # is false
		+
		+	Note that there is also a '''<tt>!==</tt>''' operator as well.
		+
		+	10 != '10' # is false
		+	10 !== '10' # is true

	== A note on coding style ==		== A note on coding style ==

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   Round 4, your guess?
-  Great that's correct.
+  Great! That's correct.
 == Let's get started ==