Tutorial by Examples: ed

Weighted Job Scheduling Algorithm

Weighted Job Scheduling Algorithm can also be denoted as Weighted Activity Selection Algorithm. The problem is, given certain jobs with their start time and end time, and a profit you make when you finish the job, what is the maximum profit you can make given no two jobs can be executed in parallel...

algorithm • Dynamic Programming

Remove docs that have a duplicate field in a collection (dedupe)

Note that the allowDiskUse: true option is optional but will help mitigate out of memory issues as this aggregation can be a memory intensive operation if your collection size is large - so i recommend to always use it. var duplicates = []; db.transactions.aggregate([ { $group: { _id: { c...

MongoDB • Aggregation

What is the difference between join and merge

Consider the dataframes left and right left = pd.DataFrame([['a', 1], ['b', 2]], list('XY'), list('AB')) left A B X a 1 Y b 2 right = pd.DataFrame([['a', 3], ['b', 4]], list('XY'), list('AC')) right A C X a 3 Y b 4 join Think of join as wanting to combine to dat...

pandas • Merge, join, and concatenate

How to get data from a prepared statement

Prepared statements See Prepared statements in MySQLi for how to prepare and execute a query. Binding of results Object-oriented style $stmt->bind_result($forename); Procedural style mysqli_stmt_bind_result($stmt, $forename); The problem with using bind_result is that it requires the s...

PHP • PHP MySQLi

Why do we need to relax all the edges at most (V-1) times

To understand this example, it is recommended to have a brief idea on Bellman-Ford single source shortest path algorithm which can be found here In Bellman-Ford algorithm, to find out the shortest path, we need to relax all the edges of the graph. This process is repeated at most (V-1) times, where...

algorithm • Bellman–Ford Algorithm

declare weakly typed variables

declare is an internal command of bash. (internal command use help for displaying "manpage"). It is used to show and define variables or show function bodies. Syntax: declare [options] [name[=value]]... # options are used to define # an integer declare -i myInteger declare -i another...

Bash • Typing variables

Simple Deref example

Deref has a simple rule: if you have a type T and it implements Deref<Target=F>, then &T coerces to &F, compiler will repeat this as many times as needed to get F, for example: fn f(x: &str) -> &str { x } fn main() { // Compiler will coerce &&&&&&a...

Rust • Auto-dereferencing

Before Submit: Validate record before it is committed to database

For this example, we want to make sure that any Employee who is marked as a Project Resource also has an appropriate Labor Cost defined. // 1.0, Revealing Module pattern var myNamespace = myNamespace || {}; myNamespace.example = (function () { /** * User Event 1.0 example detailing...

netsuite • User Event: Before and After Submit events

After Submit: Determine whether a field was changed

After the record gets stored in the database, we want to inspect what was changed on the record. We'll do this inspection by comparing values between the old and new record instances. // 1.0, Revealing Module pattern var myNamespace = myNamespace || {}; myNamespace.example = (function () { ...

netsuite • User Event: Before and After Submit events

Restrict execution based on the action that triggered the User Event

// 1.0 // Utilize the type argument and raw Strings to filter your // execution by the action function beforeLoad(type, form, request) { // Don't do anything on APPROVE // Note that `type` is an Object, so we must use ==, not === if (type == "approve") { return...

netsuite • User Event: Before Load event

Restrict execution based on the context that triggered the User Event

In SuiteScript 1.0, we retrieve the current execution context using nlapiGetContext().getExecutionContext(), then we compare the result to the appropriate raw Strings. // 1.0 in Revealing Module pattern var myNamespace = myNamespace || {}; myNamespace.example = (function () { var exports =...

netsuite • User Event: Before Load event

Violation of CLS rule: Unsigned types / sbyte

using System; [assembly:CLSCompliant(true)] namespace CLSDoc { public class Car { internal UInt16 _yearOfCreation = 0; //Warning CS3008 Identifier '_numberOfDoors' is not CLS-compliant //Warning CS3003 Type of 'Car._numberOfDoors' is not CLS-compli...

C# Language • CLSCompliantAttribute

Objective C code to make selected corner of a UiView rounded

First import #import <QuartzCore/QuartzCore.h> into your ViewController class. Here is how I set my view in code UIView *view1=[[UIView alloc]init]; view1.backgroundColor=[UIColor colorWithRed:255/255.0 green:193/255.0 blue:72/255.0 alpha:1.0]; CGRect view1Frame = view1.frame; view1Frame....

iOS • Make selective UIView corners rounded

Objective C code to convert HTML string to NSAttributedString and Vice Versa

HTML to NSAttributedString conversion Code :- //HTML String NSString *htmlString=[[NSString alloc]initWithFormat:@"<!DOCTYPE html><html><body><h1>My First Heading</h1><p>My first paragraph.</p></body></html>"]; //Converting HTML s...

iOS • Convert HTML to NSAttributed string and vice verse

Simple Drop Implementation

use std::ops::Drop; struct Foo(usize); impl Drop for Foo { fn drop(&mut self) { println!("I had a {}", self.0); } }

Rust • The Drop Trait - Destructors in Rust

Creating a shared link for a file using curl in PHP

<?php $parameters = array('path' => '/test.txt'); $headers = array('Authorization: Bearer <ACCESS_TOKEN>', 'Content-Type: application/json'); $curlOptions = array( CURLOPT_HTTPHEADER => $headers, CURLOPT_POST => true, CURLOPT_PO...

Dropbox API • Getting a shared link for a file or folder

How the custom options are used in the form class

->add('housing', EntityType::class, array( 'class' => 'AppBundle:Housing', 'choice_label' => 'housing', 'placeholder' => '', 'attr' => (in_array('Housing', $options['disabledOptions']) ? ['disabled' => 'disabl...

symfony2 • Sending options to a form class

Lazily-Evaluated Lists

It's possible to make a simple lazily-evaluated list using mutable types and closures. A lazily-evaluated list is a list whose elements are not evaluated when it's constructed, but rather when it is accessed. Benefits of lazily evaluated lists include the possibility of being infinite. import Base:...

Julia Language • Iterables

Setting the default Encoding for IO

# encode/decode UTF-8 for files and standard input/output use open qw( :encoding(UTF-8) :std ); This pragma changes the default mode of reading and writing text ( files, standard input, standard output, and standard error ) to UTF-8, which is typically what you want when writing new application...

Perl Language • File I/O (reading and writing files)

NSAttributedString to UIImage Conversion

Objective-C NSMutableAttributedString *str = [[NSMutableAttributedString alloc] initWithString:@"Hello. That is a test attributed string."]; [str addAttribute:NSBackgroundColorAttributeName value:[UIColor yellowColor] range:NSMakeRange(3,5)]; [str addAttribute:NSForegroundColorAttrib...

iOS • Convert NSAttributedString to UIImage