kmdarshan’s gists

kmdarshan / gist:b9f962c5a41bdc09ba0b

Last active August 29, 2015 14:17

Printing level tree order in objective c

	//
	// Tree.h
	// learnObjectiveC
	//
	// Created by kmd on 3/3/15.
	// Copyright (c) 2015 Happy Days. All rights reserved.
	//

	#import <Foundation/Foundation.h>

kmdarshan / gist:1d82494978d298e8cd1e

Created March 20, 2015 04:10

Queue in objective c

	//
	// RRQueue.h
	// learnObjectiveC
	//
	// Created by darshan on 3/19/15.
	// Copyright (c) 2015 Happy Days. All rights reserved.
	//

	#import <Foundation/Foundation.h>

kmdarshan / gist:ab8ccdb0640f252a0528

Created March 21, 2015 22:08

Insertion and deletion into a binary search tree in objective c

	#import

	@interface Node : NSObject{
	Node *left;
	Node *right;
	NSObject *data;
	}

	@property (nonatomic, strong) Node *left;
	@property (nonatomic, strong) Node *right;

kmdarshan / gist:bd1657c1767784df8e35

Last active August 29, 2015 14:17

subqueries VS joins

	In Mysql, if your using a subquery to update a table, it will give you an error.
	e.x. In the below query your basically trying to update and query the table at the same time. This would not be possible in Mysql.

	[code language="text"]

	UPDATE items ci SET ci.`c_id` = 27
	WHERE ci.`ID` IN (
	SELECT c.`ID`
	FROM orders f, items c
	WHERE c.`orderID` = f.`orderID` LIMIT 100;

kmdarshan / gist:4fa27d7429412833e9f1

Last active August 29, 2015 14:20

UIDynamicKit : Most commonly used animation behaviors

	@interface RRHomeViewController ()
	{
	UIButton *logoutButton;
	UIView *testAnimateView;
	}
	@property (nonatomic, strong) UIDynamicAnimator *animator;
	@property (nonatomic, strong) UIDynamicItemBehavior *linearVelocity;
	@end

	@implementation RRHomeViewController

kmdarshan / autorelease_pool1

Last active August 29, 2015 14:21

Autorelease pool

	// without using auto release pools
	NSMutableArray *temporaryArrayForPairs = [NSMutableArray new];
	for (int i=0; i<500000; i++) {
	Pair *pair = [Pair new];
	pair.grandParent = @"darshan was here";
	[temporaryArrayForPairs addObject:pair];
	}

kmdarshan / autorelease_pool2

Last active August 29, 2015 14:21

Autorelease pool2

	// Using auto release pools
	@autoreleasepool {
	NSMutableArray *temporaryArrayForPairs = [NSMutableArray new];
	for (int i=0; i<500000; i++) {
	Pair *pair = [Pair new];
	pair.grandParent = @"darshan was here";
	[temporaryArrayForPairs addObject:pair];
	}
	}

kmdarshan / blocks.m

Last active August 29, 2015 14:21

Playing around with Blocks in Objective-C

	@interface Pair : NSObject
	@property (nonatomic, copy) void (^blockAsProperty)(int val);
	+(void) displayBlock:(void(^)(int param))blockAsMethodParameter;
	@end

	@implementation Pair
	+(void) displayBlock:(void(^)(int param)) blockAsMethodParameter{
	blockAsMethodParameter(10);
	}
	@end

kmdarshan / dispatch_async_blocks.m

Last active August 29, 2015 14:21

Using dispatch queues instead of locks and synchronization blocks

	// feeder methods to test
	self.counter = 10;
	[self testThreads];
	[self serialQs];

	-(void) serialQs {

	dispatch_queue_t dispatchQueue = dispatch_queue_create("com.darshan.learn.dispatch", DISPATCH_QUEUE_SERIAL);

	__weak typeof (self) weakSelf = self;

kmdarshan / performance.html

Created May 28, 2015 00:03

Performance for a given page

	The following script calculates how much time to load a page since the most recent navigation.

	<html>
	<head>
	<script type="text/javascript">
	function onLoad() {
	var now = new Date().getTime();
	var page_load_time = now - performance.timing.navigationStart;
	alert("User-perceived page loading time: " + page_load_time);
	}

random ramblings kmdarshan