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Effective Engineer - Notes

• By Edmond Lau
• Highly Recommended 👍
• http://www.theeffectiveengineer.com/

What's an Effective Engineer?

• They are the people who get things done. Effective Engineers produce results.

Adopt the Right Mindsets

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#import <Foundation/Foundation.h>

void frequencyCounterOfWordsInSentence(NSString *sentence)
{
	NSArray *words = [sentence componentsSeparatedByString:@" "];
	NSMutableDictionary *wordCounterDict = [NSMutableDictionary dictionary];
	for(NSString *word in words)
	{
		// Remove any characters from word which is not from letter character set
		NSString *scrubbedWord = [[word componentsSeparatedByCharactersInSet:[[NSCharacterSet letterCharacterSet] invertedSet]] componentsJoinedByString:@""];

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Here's my own list of the interesting stuff announced during this year's WWDC, collected from the keynotes, various Apple docs, blog posts and tweets.

If you're planning to watch the videos, I really recommend this Mac app that helps you download and watch them: https://github.com/insidegui/WWDC.

OS X El Capitan

http://www.apple.com/osx/elcapitan-preview/

• split view - two apps side by side on full screen

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/*
 * This is an example provided by Facebook are for non-commercial testing and
 * evaluation purposes only.
 *
 * Facebook reserves all rights not expressly granted.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON INFRINGEMENT. IN NO EVENT SHALL
 * FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN

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# Script to codesign ipa with AdHoc or distribution certificate
# Execute script from the folder you have provisioning profile you want to be embedded with the IPA and name it as embedded.mobileprovision
# 
# To change the bundle identifier pass it as argument to this script first argument is taken as bundle identifier, if more than one arguments are passed then its ignored
# usage script.sh com.appid.bundleid 1.2 45 FinalIPAName

echo "Start the codesigning the app"
mv *.ipa testapp.zip # Rename ipa file to .zip
tar -xf testapp.zip  # unzip the file to reveal Payload folder
cd Payload/*.app/     # Go to Payload folder then into .app folder

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1) Algorithm Complexity - Big-O
2) Sorting - Merge, Insert, Bubble
3) Hashtables - Implement using Arrays
4) Trees - Binary, n-ary, trie-trees; balanced binary tree - Red/Black tree, splay tree, AVL tree
	Tree traversal algorithm - BFS, DFS ; difference between inorder, postorder, preorder
5) Graphs - Representation of graphs using: objects and pointers, matrix, adjacency list
	Graph traversal algorithm - BFS, DFS
	A* and Dijkstra
6) Data Structures - NP-complete problems: traveling salesman and knapsack problem
7) Discrete Mathematics - combinatorics and probability

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• UIKonf - https://www.youtube.com/user/UIKonf
• AltConference/AltWWDC - https://www.youtube.com/channel/UChiwrWoactp8mOs70j53zYw/videos
• Facebook iOS Infrastructure - https://www.youtube.com/watch?v=OJ94KqmsxiI
• Building Facebook Paper - https://www.youtube.com/watch?v=OiY1cheLpmI
• Cross platform application by Dropbox - https://www.youtube.com/watch?v=S5rXCvu9-NM
• Scaling Mobile Development at Twitter - https://www.youtube.com/watch?v=C6vYg6u7MPA

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Decrypt Binaries from AppStore IPA
-----------------------------------
* `Cydia` - Add Source - http://cydia.iphonecake.com/
* `Mobile Terminal` - login root - Clutch - Clutch <appname>
* `/var/root/` - Location for Decrypted files
* `Class-dump` - `./class-dump -H <location-of-binary> -o <location-to-save-header-files>` To dump all headers

Inspect View-Hierarchy of Apps
------------------------------
* CyDelete - Install CyDelete from Cydia if MobileSubstrate folder is not listed in /Library/.

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[
          {
            "itemId": "123456",
            "definingAttributes": [
              {
                "attributeName": "Product Length (in.)",
                "attributeValue": "10"
              },
              {
                "attributeName": "Product Width (in.)",

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int usingSubtraction(int x)
{
  return 3-x;
}

int usingDivision(int x)
{
 return 2/x;
}