Learn from Saki: Array Overrides

Code in this post can be obsolete, however, principles and theory may still apply.

On the way of development of my project I came to need to have set methods for javascript Array object especially intersection. Googling has shown up some but they were not LGPL, the licence what I need, so I’ve written them. The following override contains:

Ext message box input type configuration
Conditional Ext.overrideIf
New Array methods:
- copy – one dimensional copy method
- indexOf – index of a value within the array. New browsers may already implement this method, therefore conditional override.
- lastIndexOf – last index of a value within the array. May be already implemented by browser too.
- intersect – returns intersection of arrays, for example: [1,3,5,7].intersect([2,3,8,7,5]) returns [3,5,7]
- union – returns union of arrays, for example: [1,3,5,7].union([2,3,8,7,5]) returns [1,2,3,5,7,8]
- unique – removes duplicate values from the array and returns result as new array
Ext.ux.clone – deep object or array cloning function

Overrides code:

// vim: ts=4:sw=4:nu:fdc=4:nospell
/**
 * Ext.ux.Overrides
 *
 * This files contains various fixes and/or overridesds:
 *
 * 1. inputType selection for Ext.Msg.show
 * 2. Ext.overrideIf conditional override
 * 3. Array methods: indexOf, lastIndexOf, copy, unique, intersect, union
 * 4. Cloning function
 *
 * @author  Ing. Jozef Sakalos
 * @version $Id: Ext.ux.Overrides.js 158 2008-04-10 00:03:18Z jozo $
 * @date    13. March 2008
 *
 * @license Ext.ux.Overrides is licensed under the terms of
 * the Open Source LGPL 3.0 license.  Commercial use is permitted 
 * to the extent that the code/component(s) do NOT become part of 
 * another Open Source or Commercially licensed development library or 
 * toolkit without explicit permission.
 * 
 * License details: http://www.gnu.org/licenses/lgpl.html
 */

/*global Ext */

// {{{
// Ext.Msg input type and firefox cursor bug fix
Ext.Msg.show = Ext.Msg.show.createInterceptor(function(config) {
    // get inputType
    var inputType = config.inputType || 'text';

    // get dialog content element
    var content = Ext.Msg.getDialog().body.child('div.ext-mb-content');

    // set inputType
    var input = content.child('input');
    if(input) {
        input.set({type:inputType});    
    }

    // this seems to be already handled in Ext
    // fix firefox cursor bug
//    var overflow = config.cursorFix ? 'auto' : 'hidden';
//    if(Ext.isGecko) {
//        content.applyStyles({overflow:overflow});
//    }
}, Ext.Msg);
// }}}
// {{{
// conditional override
/**
 * Same as Ext.override but overrides only if 
 * method doesn not exist in target class
 */
Ext.overrideIf = function(origclass, overrides) {
    if(overrides) {
        var p = origclass.prototype;
        for(var method in overrides) {
            if(!p[method]) {
                p[method] = overrides[method];
            }
        }
    }
};
// }}}
// {{{
// methods for Array object
Ext.overrideIf(Array, {

    // {{{
    /**
     * One dimensional copy
     * @return {Array} New array that is copy of this
     */
     copy:function() {
        var a = [];
        for(var i = 0, l = this.length; i &lt; l; i++) {
            a.push(this[i]);
        }
        return a;
    } // eo function copy
    // }}}
    // {{{
    /**
     * @return {Integer} index of v or -1 if not found
     * @param {Mixed} v Value to find indexOf
     * @param {Integer} b Starting index
     */
    ,indexOf:function(v, b) {
        for(var i = +b || 0, l = this.length; i &lt; l; i++) {
            if(this[i] === v) { 
                return i; 
            }
        }
        return -1;
    } // eo function indexOf
    // }}}
    // {{{
    /**
     * @return {Array} intersection of this and passed arguments
     */
    ,intersect:function() {
        if(!arguments.length) {
            return [];
        }
        var a1 = this, a2, a;
        for(var k = 0, ac = arguments.length; k &lt; ac; k++) {
            a = [];
            a2 = arguments[k] || [];
            for(var i = 0, l = a1.length; i &lt; l; i++) {
                if(-1  b) {
            if(this[i] === v) { 
                return i; 
            }
        }
        return -1;
    } // eof function lastIndexOf
    // }}}
    // {{{
    /**
     * @return {Array} New array that is union of this and passed arguments
     */
    ,union:function() {
        var a = this.copy(), a1;
        for(var k = 0, ac = arguments.length; k &lt; ac; k++) {
            a1 = arguments[k] || [];
            for(var i = 0, l = a1.length; i &lt; l; i++) {
                a.push(a1[i]);
            }
        }
        return a.unique();
    } // eo function union
    // }}}
    // {{{
    /**
     * Removes duplicates from array
     * @return {Array} new array with duplicates removed
     */
    ,unique:function() {
        var a = [], i, l = this.length;
        for(i = 0; i &lt; l; i++) {
            if(a.indexOf(this[i]) &lt; 0) { 
                a.push(this[i]); 
            }
        }
        return a;
    } // eo function unique
    // }}}

});
// }}}
// {{{
// object and array cloning function
/**
 * Clone Function
 * @return {Object/Array} Deep clone of an object or an array
 */
Ext.ux.clone = function(o) {
    if(!o || 'object' !== typeof o) {
        return o;
    }
    var c = 'function' === typeof o.pop ? [] : {};
    var p, v;
    for(p in o) {
        if(o.hasOwnProperty(p)) {
            v = o[p];
            if(v &amp;&amp; 'object' === typeof v) {
                c[p] = Ext.ux.clone(v);
            }
            else {
                c[p] = v;
            }
        }
    }
    return c;
}; // eo function clone
// }}}

// eof

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// vim: ts=4:sw=4:nu:fdc=4:nospell

/**

* Ext.ux.Overrides

* This files contains various fixes and/or overridesds:

* 1. inputType selection for Ext.Msg.show

* 2. Ext.overrideIf conditional override

* 3. Array methods: indexOf, lastIndexOf, copy, unique, intersect, union

* 4. Cloning function

* @author Ing. Jozef Sakalos

* @version $Id: Ext.ux.Overrides.js 158 2008-04-10 00:03:18Z jozo $

* @date 13. March 2008

* @license Ext.ux.Overrides is licensed under the terms of

* the Open Source LGPL 3.0 license. Commercial use is permitted

* to the extent that the code/component(s) do NOT become part of

* another Open Source or Commercially licensed development library or

* toolkit without explicit permission.

* License details: http://www.gnu.org/licenses/lgpl.html

/*global Ext */

// {{{

// Ext.Msg input type and firefox cursor bug fix

Ext.Msg.show = Ext.Msg.show.createInterceptor(function(config) {

// get inputType

var inputType = config.inputType || 'text';

// get dialog content element

var content = Ext.Msg.getDialog().body.child('div.ext-mb-content');

// set inputType

var input = content.child('input');

if(input) {

input.set({type:inputType});

}

// this seems to be already handled in Ext

// fix firefox cursor bug

// var overflow = config.cursorFix ? 'auto' : 'hidden';

// if(Ext.isGecko) {

// content.applyStyles({overflow:overflow});

// }

}, Ext.Msg);

// }}}

// {{{

// conditional override

/**

* Same as Ext.override but overrides only if

* method doesn not exist in target class

Ext.overrideIf = function(origclass, overrides) {

if(overrides) {

var p = origclass.prototype;

for(var method in overrides) {

if(!p[method]) {

p[method] = overrides[method];

}

};

// }}}

// {{{

// methods for Array object

Ext.overrideIf(Array, {

// {{{

/**

* One dimensional copy

* @return {Array} New array that is copy of this

copy:function() {

var a = [];

for(var i = 0, l = this.length; i < l; i++) {

a.push(this[i]);

}

return a;

} // eo function copy

// }}}

// {{{

/**

* @return {Integer} index of v or -1 if not found

* @param {Mixed} v Value to find indexOf

* @param {Integer} b Starting index

,indexOf:function(v, b) {

for(var i = +b || 0, l = this.length; i < l; i++) {

if(this[i] === v) {

return i;

}

return -1;

} // eo function indexOf

// }}}

// {{{

/**

* @return {Array} intersection of this and passed arguments

,intersect:function() {

if(!arguments.length) {

return [];

}

var a1 = this, a2, a;

for(var k = 0, ac = arguments.length; k < ac; k++) {

a = [];

a2 = arguments[k] || [];

for(var i = 0, l = a1.length; i < l; i++) {

if(-1 b) {

if(this[i] === v) {

return i;

}

return -1;

} // eof function lastIndexOf

// }}}

// {{{

/**

* @return {Array} New array that is union of this and passed arguments

,union:function() {

var a = this.copy(), a1;

for(var k = 0, ac = arguments.length; k < ac; k++) {

a1 = arguments[k] || [];

for(var i = 0, l = a1.length; i < l; i++) {

a.push(a1[i]);

}

return a.unique();

} // eo function union

// }}}

// {{{

/**

* Removes duplicates from array

* @return {Array} new array with duplicates removed

,unique:function() {

var a = [], i, l = this.length;

for(i = 0; i < l; i++) {

if(a.indexOf(this[i]) < 0) {

a.push(this[i]);

}

return a;

} // eo function unique

// }}}

});

// }}}

// {{{

// object and array cloning function

/**

* Clone Function

* @return {Object/Array} Deep clone of an object or an array

Ext.ux.clone = function(o) {

if(!o || 'object' !== typeof o) {

return o;

}

var c = 'function' === typeof o.pop ? [] : {};

var p, v;

for(p in o) {

if(o.hasOwnProperty(p)) {

v = o[p];

if(v && 'object' === typeof v) {

c[p] = Ext.ux.clone(v);

}

else {

c[p] = v;

}

return c;

}; // eo function clone

// }}}

// eof

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saki

I'm a well seasoned developer, consultant and educator of web applications based mainly on Sencha libraries, PHP, MySQL and Node.js. Besides (Apple) computers, I love photography and mountain biking.

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