JavaScript Basics - Revision history

Scott: /* Strings */

2019-11-22T21:14:36Z

Strings

2019-11-22T19:48:37Z

Strings

← Older revision		Revision as of 19:48, 22 November 2019
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	"A B C".replace(/\s/g, '') // "ABC" (\s matches white space, g means global)		"A B C".replace(/\s/g, '') // "ABC" (\s matches white space, g means global)
	"Animal".toLowerCase() // "animal"		"Animal".toLowerCase() // "animal"
			"abcdefg".substr(0, 5) // "abcde"
			"abcdefg".substr(5) // "fg"
			"abcdefg".substr(2, 3) // "cde"
			"abcdefg".substring(0, 5) // "abcde"
			"abcdefg".substring(5) // "fg"
			"abcdefg".substring(2, 3) // "c"
	</source>		</source>

2017-09-28T18:00:19Z

References

← Older revision		Revision as of 18:00, 28 September 2017
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	== References ==		== References ==
	* https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference		* https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference
			* https://github.com/mbeaudru/modern-js-cheatsheet

	== Link to external Javscript file ==		== Link to external Javscript file ==

2017-05-05T22:11:55Z

← Older revision		Revision as of 22:11, 5 May 2017
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			== References ==
			* https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference

	== Link to external Javscript file ==		== Link to external Javscript file ==
	<source lang="html4strict">		<source lang="html4strict">

2015-10-20T17:59:23Z

← Older revision		Revision as of 17:59, 20 October 2015
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	my_array = [4, 2, 3, 1]		my_array = [4, 2, 3, 1]
	my_array.sort(); // my_array is [1, 2, 3, 4]		my_array.sort(); // my_array is [1, 2, 3, 4]
			my_array.length; // 4
	</source>		</source>
	Delete specific element from array		Delete specific element from array

2015-09-14T21:16:57Z

Strings

← Older revision		Revision as of 21:16, 14 September 2015
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	" Hello ".trim() // "Hello"		" Hello ".trim() // "Hello"
	"How are you?".split(" ") // ["How", "are", "you?"]		"How are you?".split(" ") // ["How", "are", "you?"]
			"A B C".replace(/\s/g, '') // "ABC" (\s matches white space, g means global)
			"Animal".toLowerCase() // "animal"
	</source>		</source>

2015-08-18T22:43:58Z

Arrays

← Older revision		Revision as of 22:43, 18 August 2015
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	my_array = [4, 2, 3, 1]		my_array = [4, 2, 3, 1]
	my_array.sort(); // my_array is [1, 2, 3, 4]		my_array.sort(); // my_array is [1, 2, 3, 4]
			</source>
			Delete specific element from array
			<source lang="javascript">
			var index = myArray.indexOf(element);
			if (index > -1){
			myArray.splice(index, 1);
			}
	</source>		</source>

2015-07-23T17:20:42Z

Arrays

← Older revision		Revision as of 17:20, 23 July 2015
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	my_array.forEach( function(element){		my_array.forEach( function(element){
	// do something with element		// do something with element
	}		})
	my_array.filter(function(i){return i % 2 == 0}); // [4, 2] only keeps even numbers		my_array.filter(function(i){return i % 2 == 0}); // [4, 2] only keeps even numbers
	my_array.map(function(i){return i*i}); // [1, 16, 4]		my_array.map(function(i){return i*i}); // [1, 16, 4]

2015-05-25T16:17:56Z

Objects

← Older revision		Revision as of 16:17, 25 May 2015
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	== Objects ==		== Objects ==
	<source lang="javascript">		<source lang="javascript">
	var new_object = {}; // make a new empty object		var new_object = {}; // make a new empty object
	new_object.name = "Bill"; // create a property		new_object.name = "Bill"; // create a property
	new_object["name"] = "Bill"; // same thing		new_object["name"] = "Bill"; // same thing
	for (var key in my_object){ // iterate over an object		for (var key in my_object){ // iterate over an object
	// do something with key		// do something with key
	// value is my_object[key]		// value is my_object[key]
	}		}
			var has_name = ("name" in new_object) // true
			delete new_object.name // now it's gone
	</source>		</source>

2015-05-25T15:59:32Z

Types

← Older revision		Revision as of 15:59, 25 May 2015
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	The following are considered false: <code>false</code>, <code>0</code>, <code>""</code>, <code>null</code>, <code>undefined</code>, <code>NaN</code>.		The following are considered false: <code>false</code>, <code>0</code>, <code>""</code>, <code>null</code>, <code>undefined</code>, <code>NaN</code>.

			<source lang="javascript">
			5 + 5 // 10
			5 + "5" // "55"
			5 + String(5) // "55"
			5 + Number("5") // 10
			</source>

	== Operators ==		== Operators ==