Construct the ArrayList sample code in JavaScript, And the arraylist sample code

Construct the ArrayList sample code in JavaScript, And the arraylist sample code

Previously we introduced the JavaScript Array API. In JavaScript, the Array itself is very powerful, can store any type, and the length is automatically resized, and provides traversal and filtering, methods of multiple operation arrays.

Java array (fixed length, single type ). The collection classes in Java make up for the shortcomings of arrays. Most of them use Object [] storage at the underlying layer, but they only provide dynamic resizing policies. Of course, JDK's rich APIs are unmatched by other languages.

But it does not affect my love for Java and JavaScript.

Java is like a middle-aged old woman. You can always see her charm in JDK. when building a large distributed system, it can reflect her strong education;

JavaScript is a young girl. Every time it blooms, it will arouse your inner ripple. You must be careful with your instruction before using it for your use.

Okay, forgive me for not doing the right thing.

/** *@class ArrayList *@description *@time 2014-09-16 21:59 *@author StarZou **/ function ArrayList(arr) { this._elementData = arr || []; } var arrayListPrototype = { '_arrayPrototype': Array.prototype, '_getData': function () { return this._elementData; }, 'size': function () { return this._getData().length; }, 'isEmpty': function () { return this.size() === 0; }, 'contains': function (obj) { return this.indexOf(obj) > -1; }, 'indexOf': function (obj) { var i , data = this._getData(), length = data.length; for (i = 0; i < length; i++) { if (obj === data[i]) { return i; } } return -1; }, 'lastIndexOf': function (obj) { var i , data = this._getData(), length = data.length; for (i = length - 1; i > -1; i--) { if (obj === data[i]) { return i; } } return -1; }, 'get': function (index) { return this._getData()[index]; }, 'set': function (index, element) { this._getData()[index] = element; }, 'add': function (index, element) { if (element) { this.set(index, element); } else { return this._getData().push(index); } }, 'remove': function (index) { var oldValue = this._getData()[index]; this._getData()[index] = null; return oldValue; }, 'clear': function () { this._getData().length = 0; }, 'addAll': function (index, array) { if (array) { this._getData().splice(index, 0, array); } else { this._arrayPrototype.push.apply(this._getData(), index); } } }; ArrayList.prototype = arrayListPrototype;

// Test code var arr = new ArrayList ([3, 6, 5, 'xyz', 'foo', 'xyz']); console. log (arr. contains ('xyz'); console. log (arr. indexOf ('xyz'); console. log (arr. lastIndexOf ('xyz'); console. log (arr. get (2); arr. addAll ([1, 2, 3]); console. log (arr );

The code above implements a part of it, and there are some optimizations,

In the future, we will have time to write JavaScript to simulate classes that implement data structures such as Tree, Stack, Queue, and Map.

How does servlet transmit an arraylist object to javascript to use this object?

Use <%> to write java code in the javascript tag of the page
For example
<Script>
<% List list = new ArrayList ();
For (int I = 0; I <list. size (); I ++ ){

%>

Var index = <% = list. get (I). toString () %>;
<%}

%>
</Script>

Is there a type similar to ArrayList in java in javascript? You can perform operations such as add remove.

You can use arrays directly. javascript Arrays can be used as arraylist stacks and deque. They are an all-powerful collection.

You can use push pop to add and delete items at the end of the team, shift unshift to add and delete images at the head of the team, splie to delete and add items in the array, and slice to cut the array.