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- (CGSize)calculateSize {
    
    NSShadow* shadow = [[NSShadow alloc] init];
    shadow.shadowOffset = self.shadowOffset;
    
    NSMutableParagraphStyle* paragraph = [[NSMutableParagraphStyle alloc] init];
    [paragraph setLineBreakMode:self.lineBreakMode];
    [paragraph setAlignment:self.textAlignment];
    
    NSDictionary *attrDict = @{NSFontAttributeName: self.font, NSShadowAttributeName: shadow, NSParagraphStyleAttributeName: paragraph};

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    CABasicAnimation *cornerAnim = [CABasicAnimation animationWithKeyPath:@"cornerRadius"];
    cornerAnim.fromValue = @(0.f);
    cornerAnim.toValue = @(50.f);
    cornerAnim.duration = 0.5f;
    [self.redView.layer addAnimation:cornerAnim forKey:@"cornerRadius"];
    
    self.redView.layer.cornerRadius = 50.f;
    
    [UIView animateWithDuration:1.0f animations:^{
        self.redView.transform = CGAffineTransformMakeRotation(M_PI);

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/**
 * Algorithm: fixed-partition
 *
 * The algorithm outlined by Johannes Treitz in "The algorithm
 * for a perfectly balanced photo gallery" (see url below).
 *
 * Options:
 *   - containerWidth      Width of the parent container (in pixels)
 *   - idealElementHeight  Ideal element height (in pixels)
 *   - spacing             Spacing between items (in pixels)

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1) #import <MagicalRecord/MagicalRecord.h>
2) in didFinishLaunchingWithOptions [MagicalRecord setupAutoMigratingCoreDataStack];
3) in [MagicalRecord cleanUp];

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+ (CGFloat)heightForCellWithPost:(Post *)post {
    return (CGFloat)fmaxf(70.0f, (float)[self detailTextHeight:post.text] + 45.0f);
}

+ (CGFloat)detailTextHeight:(NSString *)text {
    CGRect rectToFit = [text boundingRectWithSize:CGSizeMake(240.0f, CGFLOAT_MAX) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName: [UIFont systemFontOfSize:12.0f]} context:nil];
    return rectToFit.size.height;
}

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This macro for checking block nullability before executing them:

#define BLOCK_EXEC(block, ...) if (block) { block(__VA_ARGS__); };
Moves from this:

if (completionBlock)
{
    completionBlock(arg1, arg2);
}
to:

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SELECT * ,
    DATE_ADD(
        birthday, 
        INTERVAL IF(DAYOFYEAR(birthday) >= DAYOFYEAR(CURDATE()),
            YEAR(CURDATE())-YEAR(birthday),
            YEAR(CURDATE())-YEAR(birthday)+1
        ) YEAR
    ) AS `next_birthday`  
FROM `users` 
WHERE 

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Deploy a Express.js project on Heroku

Step by step from command line by Michael Hsu

Quick start

Create a Node.js web framework 'express'

$ express myfirstexpress && cd myfirstexpress

Declare dependencies with NPM /package.json

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npm list -g --depth 0

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const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const { CleanWebpackPlugin } = require('clean-webpack-plugin');

module.exports = {
  mode: 'development',
  entry: './src/index.js',
  devtool: 'inline-source-map',
  devServer: {
    contentBase: './dist',