Tutorial by Examples: el

Once you have your server side logging in place, it's time to hop over to the client side. If you haven't explored the console API, be prepared for a treat. There's actually all sorts of things that you can do with the built in Console API that's native to every Chrome and Safari installation. So mu...

The following uses the Chrome Logging API. If the .group() syntax is used in multiple templates, it will graphically organize the console logs from different templates into a hierarchical tree. You can also see how to inspect the current data context, and how to stringify data. Template.landingPa...

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 ...

As of Meteor 1.0.2, there's a new command shell which you can use to do interactive debugging and manage your app from the server side, just like you do with the Chrome Console on the client side! Check it out: meteor shell

Template helpers are an essential part of Blaze and provide both business logic and reactivity to a Template. It is important to remember that Template helpers are actually reactive computations that are rerun whenever their dependencies change. Depending on your needs, Template helpers can be def...

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...

To delete some lines of text when you don't know exact number of lines to delete, you try 10dd , 5dd , 3dd until you remove all the lines. Relative line numbers solves this problem, suppose we have a file containing : sometimes, you see a block of text. You want to remove it but you cannot d...

The following command executes :command on lines 23 to 56: :23,56command NB: Ranges are inclusive by default.

In the following command the range starts 6 lines above the current line and ends 3 lines below: :-6,+3command

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

In elm, a function's value is computed when the last argument is applied. In the example below, the diagnostic from log will be printed when f is invoked with 3 arguments or a curried form of f is applied with the last argument. import String import Debug exposing (log) f a b c = String.join &...

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: ...

Here is a simple example of an XAML page in WPF. It consists of a Grid, a TextBlock and a Button - the most common elements in XAML. <Window x:Class="FirstWpfApplication.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x=&q...

Introduction and motivation Expression templates (denoted as ETs in the following) are a powerful template meta-programming technique, used to speed-up calculations of sometimes quite expensive expressions. It is widely used in different domains, for example in implementation of linear algebra ...

Lets suppose you have 2 Lists A and B, and you want to remove from B all the elements that you have in A the method in this case is List.removeAll(Collection c); #Example: public static void main(String[] args) { List<Integer> numbersA = new ArrayList<>(); List<Intege...

Reverse elements within a tuple colors = "red", "green", "blue" rev = colors[::-1] # rev: ("blue", "green", "red") colors = rev # colors: ("blue", "green", "red") Or using reversed (reversed gives an it...

Elasticsearch uses a YAML (Yet Another Markup Language) configuration file that can be found inside the default Elasticsearch directory (RPM and DEB installs change this location amongst other things). You can set basic settings in config/elasticsearch.yml: # Change the cluster name. All nodes in ...

Example uses basic HTTP syntax. Any <#> in the example should be removed when copying it. Like most _cat APIs in Elasticsearch, the API selectively responds with a default set of fields. However, other fields exist from the API if you want them: GET /_cat/health?help <1> ?help cau...