(public).sospep.subjects ~ view article ~ Array

<h1 style="text-align: center;">Arrays</h1>
<h2>[WHAT]</h2>
<ol>
<li><strong>] Array stores a number of elements in a specific order. Here are some examples</strong></li>
<ol>
<li>] pets = ["dog","cat","mouse"]</li>
<li>] numbersOdd = [1,3,5,7,9]</li>
<li>] datesHolidays2013 =&nbsp; ['2013-01-01','2013-04-21','2013-07-01']</li>
<li>] namesHolidays = ['New Years Day','Good Friday', 'Canada Day']&nbsp;</li>
</ol>
<li><strong>] They are accessed using an integer to specify which element is required (although the elements may be of almost any type).</strong></li>
<ol>
<li>] var myPet = pets[0], where 0 is the first element in the pets &nbsp;Array</li>
</ol>
<li><strong>] Typical implementations allocate contiguous memory words for the elements of arrays (but this is not always a necessity).</strong></li>
<ol>
<li>] how arrays are stored in memory, a sequential block of</li>
</ol>
<li><strong>] Arrays may be fixed-length or expandable.</strong></li>
<ol>
<li>]</li>
</ol>
<li><strong>] single dimensional array</strong></li>
<ol>
<li>] the array contains a number of items(), all of the same type</li>
</ol>
<li><strong>] multi-dimensional arrays</strong></li>
<ol>
<li>]</li>
</ol></ol>
<h2>[WHY]</h2>
<ol>
<li><strong>] define ...</strong></li>
<ol>
<li>]&nbsp;a collection of contiguous elements, may be a fixed size or expandable(dynamic),&nbsp;each element is accessed by its numeric index&nbsp;</li>
<li>] a set/collection of related data elements accessed by their index</li>
<li>] stores a number of elements in a specific order. They are accessed using an integer (index)&nbsp;to specify which element is required (although the elements may be of almost any type). Typical implementations allocate contiguous memory words for the elements of arrays (but this is not always a necessity). Arrays may be fixed-length or expandable.</li>
</ol>
<li><strong>] operations on array </strong><ol>
<li>] Allocation</li>
<li>] Accessing</li>
<li>] Redimensioning</li>
</ol></li>
</ol>
<h2>[WHERE]</h2>
<ol>
<li>]</li>
</ol>
<h2>[WHEN]</h2>
<ol>
<li>]</li>
</ol>
<h2>[EXAMPLE]</h2>
<h2>[HOW-TO example code, language = javascript]</h2>
<ol>
<li><strong>] CREATE / DECLARATION</strong></li>
<ol>
<li>] var&nbsp;pets = new Array("dog","cat","mouse") || var pets = ["dog","cat","mouse"];</li>
</ol>
<li><strong>] ACCESS</strong></li>
<ol>
<li>] return pets[1];&nbsp; // output =&nbsp;cat</li>
</ol>
<li><strong>] ADD ELEMENT</strong></li>
<ol>
<li>] pets.push("gerbil"); - adds a new element to the end of the array, returns the new length of the array</li>
</ol>
<li><strong>] REMOVE ELEMENT</strong></li>
<ol>
<li>] pets.pop() - removes the last element of the array,</li>
</ol>
<li><strong>] REPLACE ELEMENT</strong></li>
<ol>
<li>] pets[0] = "pup";</li>
</ol>
<li><strong>] MORE Methods and Examples in</strong></li>
<ol>
<li>] javascript arrays</li>
</ol></ol>
<h2>[REFERENCE]</h2>
<ol>
<li>]</li>
</ol>
<h1 style="text-align: center;">&nbsp;</h1>

~ view article ~ Chapter] ch-002-Arrays FROM [ Book] data-structures IN [ libraries] technology-developer-software