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<?php
    // IMPORTANT: this is a reduced version of ezdb1.php
    // Its purpose is SPEED, only SPEED, use ezdb1.php if you want debug information.
    // YOU HAVE BEEEN WARNED. 
    //              -- ricardo galli
    //
    // ==================================================================
    //  Author: Justin Vincent (justin@visunet.ie)
    //  Web:    http://php.justinvincent.com
    //  Name:   ezSQL

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<?php

class HZip
{
  /**
   * Add files and sub-directories in a folder to zip file.
   * @param string $folder
   * @param ZipArchive $zipFile
   * @param int $exclusiveLength Number of text to be exclusived from the file path.
   */

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1.- Evitar la creación innecesaria de objetos, Lazy Initialitation

La creación de objetos en Java es una de las operaciones mas costosas en términos de uso de memoria e impacto en el performance.  Esto es evitable creando o inicializando objetos solo en el momento en que serán requeridos en el código.

public class Paises {

    private List paises;

    public List getPaises() {
        //se inicializa solo cuando es requerido

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import urllib2

for i in range(5000):
	name = str(i) + '.png'
	try:
		url = 'http://www.example.com/%s' % name
		response = urllib2.urlopen(url)
		output = open('folder/' + name, 'wb')
		output.write(response.read())
		output.close()

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NSString *path = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"database.db"];
FMDatabase *database = [FMDatabase databaseWithPath:path];
[database open];

[database executeUpdate:@"INSERT INTO table (field1, field2) VALUES (?, ?)", value1, value2];

[database close];

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// version 1
- (UIImage *)imageWithImage:(UIImage *)image scaledToFillSize:(CGSize)size
{
    CGFloat scale = MAX(size.width / image.size.width, size.height / image.size.height);
    CGFloat width = image.size.width * scale;
    CGFloat height = image.size.height * scale;
    CGRect imageRect = CGRectMake((size.width - width)/2.0f, (size.height - height)/2.0f, width, height);
    
    UIGraphicsBeginImageContextWithOptions(size, NO, 0);
    [image drawInRect:imageRect];

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- (void)saveImage:(UIImage *)image
{
    if (image != nil) {
        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        NSString *documentsDirectory = [paths objectAtIndex:0];
        NSString *path = [documentsDirectory stringByAppendingPathComponent:@"test.png"];
        NSData *data = UIImagePNGRepresentation(image);
        [data writeToFile:path atomically:YES];
    }
}

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- (UIImageView *)loadImageWithUrl:(NSString *)stringUrl
{
    UIImageView *imageView = [[UIImageView alloc] init];
    NSURL *url = [NSURL URLWithString:stringUrl];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    UIImage *placeholder = [UIImage imageNamed:@"placeholder"];
    
    __weak UIImageView *weakImageView = imageView;
    
    [imageView setImageWithURLRequest:request placeholderImage:placeholder success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image) {

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// set delegate on header file
// <UINavigationControllerDelegate, UIImagePickerControllerDelegate>

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo
{
    // set on a UIImageView
    self.selectedImage.image = image;
    [self dismissModalViewControllerAnimated:YES];
}

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view.layer.cornerRadius = 5.0f;
view.layer.masksToBounds = YES;