Creating a Nodejs Module 1) Create a package.json using npm init $ npm init This utility will walk you through creating a package.json file. It only covers the most common items, and tries to guess sane defaults. See npm help json for definitive documentation on these fields and exactly what they do. Use npm install <pkg> --save afterwards to install a package and save it as a dependency in the package.json file. ...
Sample JSON File Sample JSON File containing well known programmers that we use for the following examples coders.json [ { "name": "Bjarne Stroustrup", "languages": [ { "name": "C++", "year_created": 1983 } ], "details": { "nationality": "Danish", "awards": ["IEEE Computer Society Computer Pioneer Award", "Charles Stark Draper Prize"] } }, { "name": "Guido van Rossum", "languages": [ { "name": "Python", "year_created": 1991 } ], "details": { "nationality": "Dutch", "awards": ["Free Software Foundation Award for the Advancement of Free Software", "NLUUG Award"] } }, { "name": "James Gosling", "languages": [ { "name": "Java", "year_created": 1995 } ], "details": { "nationality": "Canadian", "awards": ["Order of Canada", "The Economist Innovation Award"] } }, { "name": "Dennis Ritchie", "languages": [ { "name": "C", "year_created": 1972 }, { "name": "Unix", "year_created": 1969 } ], "details": { "nationality": "American", "awards": ["Turing Award", "National Medal of Technology"] } }, { "name": "Brendan Eich", "languages": [ { "name": "JavaScript", "year_created": 1995 } ], "details": { "nationality": "American", "awards": ["Webby Award"] } } ] ...
Start an Image with kcat / kafka-cat for Debugging kubectl -n NAMESPACE run "$(whoami)-debug" -it --rm \ --image=confluentinc/cp-kafkacat:6.1.9 \ --restart=Never \ -- bash Dockerfile for Kafka Analysis Container with different Tools With jq, kafka console tools, schema registry tools and kafkacat installed …. Dockerfile FROM confluentinc/cp-kafka:6.2.1 as cp-kafka FROM confluentinc/cp-schema-registry:6.2.1 as cp-schema-registry FROM debian:10-slim ARG DEBIAN_FRONTEND=noninteractive # Install necessary tools RUN apt-get update && apt-get install -y \ curl \ jq \ yq \ && rm -rf /var/lib/apt/lists/* # Install kafkacat binary RUN apt-get update && apt-get install -y kafkacat && rm -rf /var/lib/apt/lists/* # Copy Kafka binaries COPY --from=cp-kafka /usr/bin/kafka-* /usr/bin/ COPY --from=cp-schema-registry /usr/bin/schema-registry* /usr/bin/ # Copy entrypoint script COPY entrypoint.sh /usr/bin/entrypoint.sh RUN chmod +x /usr/bin/entrypoint.sh ENTRYPOINT ["/usr/bin/entrypoint.sh"] ...
Checks / Exit Conditions Instead of writing something like if !condition throw … we may use require and check for quick exit conditions: val num = 1; require(num > 1){ // ... } val num = 1; require(num > 1){ // .. } Pluralize Strings Adding pluralization as extension function fun String.pluralize(count:Int):String { return if (count > 1){ this + 's' } else { this } } Use it like this ...
Rerun existing completed Job kubectl replace deletes the old job, if there is any error, your job definition is lost, don’t forget to save it first! Replace an existing Job with itself kubectl get job JOBNAME -o yaml | kubectl replace --force -f - Sometimes there are errors importing the job template due to auto-generated labels or selectors .. a quick and dirty hack is to filter them out using jq ...
These are not only linux snippets but also bash snippets and snippets using tools that run under Linux, *nix or sometimes even MacOSX, I should reorder this article someday ;) Settings for more reliable bash scripts set -euo pipefail this gives us … -e: exit script if a single command fails -u: exit script if an unset variable is used -o pipefail: return value of a pipeline is the status of the last command to exit with a non-zero status, or zero if no command exited with a non-zero status ...
Precondition: Postgres Schema exists Using this precondition should run a migration only if the schema my_schema exists. <preConditions onFail="CONTINUE"> <sqlCheck expectedResult="1"> SELECT COUNT(1) FROM information_schema.schemata WHERE schema_name = 'my_schema'; </sqlCheck> </preConditions> Resources: https://docs.liquibase.com/concepts/changelogs/preconditions.html
Permanently add SSH Key Password to the Keychain ssh-add --apple-use-keychain ~/.ssh/THEPRIVATEKEY Tool for Window Management Install rectangle Install with brew brew install rectangle Useful Shortcuts Move current app to previous or next display Ctrl+Opt+Cmd+LEFT or Ctrl+Opt+Cmd+RIGHT Maximize window Ctrl+Opt+ENTER Beginners List of Shortcuts coming from Linux … Finder Show hidden files in Finder: cmd + shift + . Open Finder: Option + Cmd + Space Open Location: Shift + Cmd + G Change to parent dir in Finder: super + UP ...
Extract Coordinates from the POM Helpful for build and integration environments, pipelines etc. Exctract the Project version from the pom.xml mvn org.apache.maven.plugins:maven-help-plugin:3.1.0:evaluate -Dexpression=project.version -q -DforceStdout Override a Property via local configuration e.g. to override the property xxx from your project’s pom.xml Create a directory .mvn in your project directory root Create a file named maven.config in this directory Insert -Dxxx=newvalue into the file to override this property Don’t forget to add .mvn to your .gitignore! ...
Data Normalizing Formula newVal = (oldVal-min) / (max-min) Ugly Scala Example package com.hascode import scala.collection.mutable.LinkedList object NormalizerExample extends App { val dataSet = LinkedList(1., 6.5, 3., 6.2, 20., 31.2, 50.2, 12., 0.24, 1.224, 2.2, 3.) for ((num, index) <- dataSet.zipWithIndex) { dataSet(index) = (num - dataSet.min) / (dataSet.max - dataSet.min) } println("Normalized: " + dataSet) } Normalized: LinkedList(0.01521216973578863, 0.12921819759798853, 0.05947594797769014, 0.12324029048767723, 0.3982240175619966, 0.6213992163469515, 1.0, 1.0, 0.07531115879828326, 0.40498283261802576, 0.7319742489270387, 1.0)