Tutorial by Examples: le

Logging can often clutter up the console, so it's common to define log levels to control what detail of data is getting logged. A common pattern is to specify a log level variables. var DEBUG = false; var TRACE = false; Template.landingPage.events({ 'click .selectItemButton':function(){ ...

Some teams find that they want to leave console log statements in their code, but not have them display in production. They will override the logging functions if a variable isn't set (possibly an environment variable). Additionally, this may qualify as a security feature in some situations. if (...

A special mention should be made for the community developed LogLevel package. It appears to strike a balance between being lightweight and simple to use, while working well with Meteor's bundle pipeline and preserving line numbers and filenames. https://atmospherejs.com/practicalmeteor/loglevel ...

One favored approach to deploying to a server is to use Git or GitHub. This basically involves logging into your server, moving to the directory you want to run your app from, then cloning your files directly from GitHub. You then build your app on the server. This approach ensures that platform spe...

Alternatively, you may want to build your application, and then deploy it.. cd myapp meteor build --directory ../output cd .. scp output -r username@destination_host:/var/www/myapp-production

https://www.phusionpassenger.com/ https://github.com/phusion/passenger https://github.com/phusion/passenger/wiki/Phusion-Passenger:-Meteor-tutorial#wiki-installing

Ensure that you install the correct npm dependencies (babel decided to split itself into a bunch of packages, something to do with "peer dependencies"): npm install webpack webpack-node-externals babel-core babel-loader babel-preset-react babel-preset-latest --save webpack.config.js: mo...

This is very common, you memorize a path to a file or folder, you open up Vim and try to write what you've just memorized, but you are not 100% sure it's correct, so you close the editor and start over. When you want the path completion feature, and you have a file /home/ubuntu/my_folder/my_file a...

SELECT DISTINCT ContinentCode FROM Countries; This query will return all DISTINCT (unique, different) values from ContinentCode column from Countries table ContinentCodeOCEUASNAAF SQLFiddle Demo

:s/foo/bar Replace the first instance of foo with bar on the current line. :s/foo/bar/g Replace every instance of foo with bar on the current line. :%s/foo/bar/g Replace foo with bar throughout the entire file.

In the assets initalizer (config/initializers/assets.rb) are a few files explicitly defined to be precompiled. # Precompile additional assets. # application.coffee, application.scss, and all non-JS/CSS in app/assets folder are already added. # Rails.application.config.assets.precompile += %w( sea...

Macros are simple string replacements. (Strictly speaking, they work with preprocessing tokens, not arbitrary strings.) #include <stdio.h> #define SQUARE(x) x*x int main(void) { printf("%d\n", SQUARE(1+2)); return 0; } You may expect this code to print 9 (3*3), ...

To use multiple databases in Django, just specify each one in settings.py: DATABASES = { 'default': { 'NAME': 'app_data', 'ENGINE': 'django.db.backends.postgresql', 'USER': 'django_db_user', 'PASSWORD': os.environ['LOCAL_DB_PASSWORD'] }, 'users': {...

Ansible uses the concept of roles to better allow modular code and avoid repeating yourself. A role is simply a folder structure that Ansible knows where to load vars files, tasks and handlers from. An example might look something like this: apache/ ├── defaults │   └── main.yml ├── files │   ...

Roles also enable you to define other roles as a dependency by creating a meta/main.yml file with a dependencies block: dependencies: - role: common It's also possible to pass a value to a parameter/variable in the dependent role: dependencies: - { role: common, some_parameter: 3 } Or ...

It's also possible to easily share roles with the community or download roles that have been created by other members of the community with Ansible Galaxy. Ansible ships with a command line tool called ansible-galaxy that can be used to install roles in the role directory defined in the ansible.cfg...

class Digit { public Digit(double d) { val = d; } public double val; // User-defined conversion from Digit to double public static implicit operator double(Digit d) { Console.WriteLine("Digit to double implict conversion called"); return d.val;...

package org.bookmytickets.controller; import java.util.List; import org.bookmytickets.model.Customer; import org.bookmytickets.repository.CustomerRepository; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.PathVariable; import o...

var dispatch = d3.dispatch("statechange"); dispatch.on('statechange', function(e){ console.log(e) }) setTimeout(function(){dispatch.statechange('Hello, world!')}, 3000)

Multiple FOR clauses are allowed in a LOOP. The loop finishes when the first of these clauses finishes: (loop for a in '(1 2 3 4 5) for b in '(a b c) collect (list a b)) ;; Evaluates to: ((1 a) (2 b) (3 c)) Other clauses that determine if the loop should continue can be combined: ...