Arrays - Revision history

Lerc at 09:50, 10 December 2015

2015-12-10T09:50:09Z

Lerc at 09:44, 10 December 2015

2015-12-10T09:44:56Z

Lerc: Created page with "Arrays are a good way to handle lists of things. In JavaScript, Arrays use the square brackets [ and ] To create an Array, all you need to do is assign the list to a variab..."

2015-05-14T20:18:21Z

Created page with "Arrays are a good way to handle lists of things. In JavaScript, Arrays use the square brackets [ and ] To create an Array, all you need to do is assign the list to a variab..."

New page

Arrays are a good way to handle lists of things. In JavaScript, Arrays use the square brackets [ and ]

To create an Array, all you need to do is assign the list to a variable
<pre>
var m = [3,6,8];
</pre>

To access individual items of the list you use the square brackets again.
<pre>
var p = m[1];
</pre>

Entries in the list start counting from zero so <tt>m[0]</tt> is the first item in the list. <tt>[2]</tt> accesses the item at position 2 but it is important to remember that position 2 is the third item in the list. If you are new to programming, this might seem a bit odd at first. don't worry, it doesn't take too long to adjust to counting from zero.

<edcode>
var names = ["Jane","Pete","Bruce","Bella"];
var someNumbers = [5,7,9,1,3,3,3,4];

print("The arrays are");
print(names);
print(someNumbers);

print("Arrays start counting at zero so their first item is accessed by [0]",0,150);
print(names[0]);
print(someNumbers[0]);

print("Their third item is [2] ",0,300);
print(names[2]);
print(someNumbers[2]);

</edcode>

You can also add items to lists. The <tt>push</tt> function is available to add items to the
<edcode>
var fruits = [];
fruits.push('banana', 'apple', 'peach');

print(fruits);

print("there are " +fruits.length+ " fruits");
</edcode>

The mozilla foundation has documentation on Javascript Arrays at https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array

In additon to the standard features of Arrays available to JaveaScript users, Code on this wiki has been sweetened with SugarJS
The additional features are documented at http://sugarjs.com/api/Array

SugarJS allows some cool abilities like <tt>exclude</tt>

<edcode>
var fruits = [];
fruits.push('banana', 'apple', 'peach');

fruits = fruits.exclude('apple');

print(fruits);

print("there are " +fruits.length+ " fruits");
</edcode>

← Older revision		Revision as of 09:44, 10 December 2015
Line 43:		Line 43:


−	The ~~mozilla~~ foundation has documentation on ~~Javascript~~ Arrays at https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array	+	The Mozilla foundation has documentation on JavaScript Arrays at https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array

	In additon to the standard features of Arrays available to JaveaScript users, Code on this wiki has been sweetened with SugarJS		In additon to the standard features of Arrays available to JaveaScript users, Code on this wiki has been sweetened with SugarJS

@@ Line 1: / Line 1: @@
 Arrays are a good way to handle lists of things.  In JavaScript, Arrays use the square brackets [ and ]
-To create an Array, all you need to do is assign the list to a variable
+To create an Array, all you need to do is <code>[]</code> for an empty array or<code>[9,3,2]</code> for an array with three numbers.  You can assign these to variables like any other value.
 <pre>
-    var m = [3,6,8];
+   var mt = [];
 </pre>
@@ Line 43: / Line 44: @@
-The Mozilla foundation has documentation on JavaScript Arrays at https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array
+The mozilla foundation has documentation on Javascript Arrays at https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array
 In additon to the standard features of Arrays available to JaveaScript users,  Code on this wiki has been sweetened with SugarJS