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//events - a super-basic Javascript (publish subscribe) pattern

var events = {
  events: {},
  on: function (eventName, fn) {
    this.events[eventName] = this.events[eventName] || [];
    this.events[eventName].push(fn);
  },
  off: function(eventName, fn) {
    if (this.events[eventName]) {

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- (void) URLRequestObjCParaOCDN {
    
    //descomenta isto ---> //__weak "nomeDaClasseOndeTensIsto" *weakSelf = self; //nao uses self. em lado nenhum no block, usa weakSelf. nao pode originar leaks e é igual #proTip
    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"o teu link aqui"]];
    [[[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:
      ^(NSData *data, NSURLResponse *response, NSError *error) {
          
          //Ele so executa isto quando o request e finalizado, isto e executado numa background thread. Se aqui dentro precisares de usar um "self." diz-me que ensino-te a fazer um weakify ao self para nao teres um memory leak. O "error" so traz erros quando nao tens net e assim, o data é onde vem o json ou o erro do body, o response e onde veem os headers.
          

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+ (UIImage *)iconWithFont:(UIFont *)font named:(NSString *)iconNamed forSize:(CGFloat)fontSize{
    static NSCache *cache = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        cache = [[NSCache alloc] init];
    });

    NSString *identifier = [NSString stringWithFormat:@"%@%@%f", font.fontName, iconNamed, fontSize];
    UIImage *image = [cache objectForKey:identifier];
    if(image == nil){

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Running Node Modules in React Native

How to use packages that depend on Node.js core modules in React Native.

Node.js Core Modules

Node has several modules that are automatically available via require(): http, crypto, etc. While these modules are available in Node, they are not automatically available in other environments

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Using Git

Global Settings

• Related Setup: https://gist.github.com/hofmannsven/6814278
• Related Pro Tips: https://ochronus.com/git-tips-from-the-trenches/
• Interactive Beginners Tutorial: http://try.github.io/
• Git Cheatsheet by GitHub: https://services.github.com/on-demand/downloads/github-git-cheat-sheet/

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import numpy as np


class NeuralNetwork(object):
    
    #def sigmoid(x):
        #return 1 / (1 + np.exp(-x))
    
    def __init__(self, input_nodes, hidden_nodes, output_nodes, learning_rate):
        # Set number of nodes in input, hidden and output layers.

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RN < 0.50 - watchman watch-del-all && rm -rf $TMPDIR/react-* && rm -rf node_modules/ && npm cache clean && npm install && npm start -- --reset-cache
RN >= 0.50 -  watchman watch-del-all && rm -rf $TMPDIR/react-native-packager-cache-* && rm -rf $TMPDIR/metro-bundler-cache-* && rm -rf node_modules/ && npm cache clean && npm install && npm start -- --reset-cache

npm >= 5 - watchman watch-del-all && rm -rf $TMPDIR/react-* && rm -rf node_modules/ && npm cache verify && npm install && npm start -- --reset-cache

Windows - del %appdata%\Temp\react-native-* & cd android & gradlew clean & cd .. & del node_modules/ & npm cache clean --force & npm install & npm start -- --reset-cache

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Step 1: Generate first ssh key Type the following command to generate your first public and private key on a local workstation. Next provide the required input or accept the defaults. Please do not change the filename and directory location.

workstation 1 $ ssh-keygen -t rsa

Finally, copy your public key to your remote server using scp