Yes, there are several ways to do this, but none of them are as direct and simple as git v2.1.2; htop v1.2.3 and come with a lot of caveats.
aside
Specifying versions for programming language packages are possible too, but that topic seems to be even messier. The most promising standardization effort to date is [dream2nix][1].
That is, available at the time of this writing:
It's great for beginners. Then it turns into a mess.
Below are the Big O performance of common functions of different Java Collections.
| List | Add | Remove | Get | Contains | Next | Data Structure |
|---|---|---|---|---|---|---|
| ArrayList | O(1) | O(n) | O(1) | O(n) | O(1) | Array |
| LinkedList | O(1) | O(1) | O(n) | O(n) | O(1) | Linked List |
| CopyOnWriteArrayList | O(n) | O(n) | O(1) | O(n) | O(1) | Array |
| SHELL=/bin/bash | |
| # to see all colors, run | |
| # bash -c 'for c in {0..255}; do tput setaf $c; tput setaf $c | cat -v; echo =$c; done' | |
| # the first 15 entries are the 8-bit colors | |
| # define standard colors | |
| ifneq (,$(findstring xterm,${TERM})) | |
| BLACK := $(shell tput -Txterm setaf 0) | |
| RED := $(shell tput -Txterm setaf 1) |
| package com.operative.pipelinetracker.controller; | |
| import java.util.HashMap; | |
| import java.util.Map; | |
| import java.util.Properties; | |
| import org.apache.kafka.clients.consumer.KafkaConsumer; | |
| import org.apache.kafka.clients.consumer.OffsetAndMetadata; | |
| import org.apache.kafka.common.TopicPartition; | |
| import org.apache.kafka.common.serialization.StringDeserializer; |
| postgres: | |
| image: postgres:9.4 | |
| volumes: | |
| - ./init.sql:/docker-entrypoint-initdb.d/init.sql |
| # Detect operating system in Makefile. | |
| # Author: He Tao | |
| # Date: 2015-05-30 | |
| OSFLAG := | |
| ifeq ($(OS),Windows_NT) | |
| OSFLAG += -D WIN32 | |
| ifeq ($(PROCESSOR_ARCHITECTURE),AMD64) | |
| OSFLAG += -D AMD64 | |
| endif |
| Latency Comparison Numbers (~2012) | |
| ---------------------------------- | |
| L1 cache reference 0.5 ns | |
| Branch mispredict 5 ns | |
| L2 cache reference 7 ns 14x L1 cache | |
| Mutex lock/unlock 25 ns | |
| Main memory reference 100 ns 20x L2 cache, 200x L1 cache | |
| Compress 1K bytes with Zippy 3,000 ns 3 us | |
| Send 1K bytes over 1 Gbps network 10,000 ns 10 us | |
| Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD |
| #!/usr/bin/perl | |
| # | |
| # Pre-commit hook for running checkstyle on changed Java sources | |
| # | |
| # To use this you need: | |
| # 1. checkstyle's jar file somewhere | |
| # 2. a checkstyle XML check file somewhere | |
| # 3. To configure git: | |
| # * git config --add checkstyle.jar <location of jar> | |
| # * git config --add checkstyle.checkfile <location of checkfile> |
