Super Array

super_array.js

var SA = function( a ) {

    a.has = function( v ) {
        var i = a.length;
        for ( i; i--; )
            if ( a[ i ] === v )
                return true;
        return false;
    };

    a.each = function( f ) {
        var i = 0,
            n = a.length;
        for ( i; i < n; i++ )
            f( a[ i ], i );
        return a;
    };

    a.remove = function( v ) {
        var i = a.length;
        for ( i; i--; )
            if ( a[ i ] === v )
                a.splice( i, 1 );
        return a;
    };

    a.replace = function( b, c ) {
        var i = a.length;
        for ( i; i--; )
            if ( a[ i ] === b )
                a[ i ] = c;
        return a;
    };

    a.count = function( v ) {
        var c = 0,
            i = a.length;
        for ( i; i--; )
            if ( a[ i ] === v )
                c++;
        return c;
    };

    a.removeDuplicate = function() {
        var i = a.length;
        for ( i; i--; )
            if ( a.count( a[ i ] ) > 1 )
                a.splice( i, 1 );
        return a;
    };

    return a;

};

use.js

var foo = SA( [ 1, 2, 3 ] );

foo.push( 'four' );

foo.each( function( a ) {
    console.log( a );
} )

foo.remove( 1 );

foo.replace( 2, 'two' );

foo.push( 'two' );

foo.removeDuplicate();