Tutorial by Examples: l

;;Recursively print the elements of a list (defun print-list (elements) (cond ((null elements) '()) ;; Base case: There are no elements that have yet to be printed. Don't do anything and return a null list. (t ;; Recursive case ;; Print the next elem...

You can technically access the Google Analytics APIs using any programing language that can handle a HTTP Post or HTTP Get request. That being said, Google has also created a number of official standard client libraries to help you with this. Using a standard client library for your chosen programm...

For performance reasons, or due to the existence of mature C libraries, you may want to call C code from a Haskell program. Here is a simple example of how you can pass data to a C library and get an answer back. foo.c: #include <inttypes.h> int32_t foo(int32_t a) { return a+1; } F...

Let us assume the following stock market data stored in HDFS. It is a CSV file with fields: Symbol, Date, Open, High, Close & Volume. ABT,20160106,42.310001,42.98,42.209999,42.560001,5906000 BAC,20160201,14.05,14.09,13.8,13.96,105739400 CAS,20160129,1.9,1.97,1.83,1.84,34500 DCA,20160129,3.46...

Find div with id="article" and strip out all the inner script tags. #!/usr/bin/env stack -- stack --resolver lts-7.1 --install-ghc runghc --package text --package lens --package taggy-lens --package string-class --package classy-prelude {-# LANGUAGE NoImplicitPrelude #-} {-# LANGUAGE O...

Here is an example of an Azure Powershell automation runbook that deletes any blobs in an Azure storage container that are older than a number of days. This may be useful for removing old SQL backups to save cost and space. It takes a number of parameters which are self explanatory. Note: I have ...

View tables ActiveRecord::Base.connection.tables Delete any table. ActiveRecord::Base.connection.drop_table("users") ------------OR---------------------- ActiveRecord::Migration.drop_table(:users) ------------OR--------------------- ActiveRecord::Base.connect...

Most examples of a function returning a value involve providing a pointer as one of the arguments to allow the function to modify the value pointed to, similar to the following. The actual return value of the function is usually some type such as an int to indicate the status of the result, whether ...

Debugging by raising exceptions is far easier than squinting through print log statements, and for most bugs, its generally much faster than opening up an irb debugger like pry or byebug. Those tools should not be your first step. Debugging Ruby/Rails Quickly: 1. Fast Method: Raise an Exceptio...

Often the easiest solution is simply to pass 2D and higher arrays around as flat memory. /* create 2D array with dimensions determined at runtime */ double *matrix = malloc(width * height * sizeof(double)); /* initialise it (for the sake of illustration we want 1.0 on the diagonal) */ int x, y...

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MULTIPLY 5 BY a MULTIPLY a BY b ON SIZE ERROR PERFORM error-handling NOT ON SIZE ERROR PERFORM who-does-that END-MULTIPLY MULTIPLY a BY b GIVING x ROUNDED MODE IS PROHIBITED y ROUNDED MODE IS NEAREST-EVEN z ROUNDED ...

Any method in Rails model can return boolean value. simple method- ##this method return ActiveRecord::Relation def check_if_user_profile_is_complete User.includes( :profile_pictures,:address,:contact_detail).where("user.id = ?",self) end Again simple method returning bool...

This example uses the official Google .net Client library. PM> Install-Package Google.Apis.AnalyticsReporting.v4 Authorization Requires one of the following OAuth scopes: https://www.googleapis.com/auth/analytics.readonly https://www.googleapis.com/auth/analytics Oauth2 // The...

API requests are HTTP POST with the access token attached at the end of the API end point. Authorization Requires one of the following OAuth scopes: https://www.googleapis.com/auth/analytics.readonly https://www.googleapis.com/auth/analytics Note when posting the data use ContentType = &...

Inside a Project configuration, you can Create build configuration: Manually Provide a Name and a Description. The Build Configuration ID is generated from the ProjectName, and the Build Configuration Name's. Once your configuraion is Saved, you can specify a Version Control Settings. This will ...

Whenever we want our assembly to install in GAC then it is must to have a strong name. For strong naming assembly we have to create a public key. To generate the .snk file. To create a strong name key file Developers command prompt for VS2015 (with administrator Access) At the command prompt...

bool is a datatype defined in C99. Boolean values are used in conditionals, such as if or while statements, to conditionally perform logic or repeat execution. When evaluating a conditional statement, the value 0 is considered “false”, while any other value is considered “true”. Because NULL ...

// Let's take a mutable piece of data, a 4-byte integer in this case let mut some_data: u32 = 14; // Create a mutable raw pointer pointing to the data above let data_ptr: *mut u32 = &mut some_data as *mut u32; // Note: creating a raw pointer is totally safe but dereferencing a raw pointe...

Unlike normal Rust references, raw pointers are allowed to take null values. use std::ptr; // Create a const NULL pointer let null_ptr: *const u16 = ptr::null(); // Create a mutable NULL pointer let mut_null_ptr: *mut u16 = ptr::null_mut();