Disclaimer 1: Type classes are great but they are not the right tool for every job. Enjoy some balance and balance to your balance.
Disclaimer 2: I should tidy this up but probably won’t.
Disclaimer 3: Yeah called it, better to be realistic.
Type classes are a language of their own, this is an attempt to document features and give a name to them.
Minimal example: transcode from MP3 to WMA:
ffmpeg -i input.mp3 output.wma
You can get the list of supported formats with:
ffmpeg -formats
Convert WAV to MP3, mix down to mono (use 1 audio channel), set bit rate to 64 kbps and sample rate to 22050 Hz:
| /* -------------------------------------------------------------------------- */ | |
| gen2 Core i5 (Sandy Bridge): | |
| $ clang -cc1 -version | |
| LLVM (http://llvm.org/): | |
| LLVM version 3.4svn | |
| Optimized build. | |
| Built Oct 13 2013 (18:10:38). | |
| Default target: x86_64-unknown-linux-gnu | |
| Host CPU: corei7-avx |
| # Copyright Louis Dionne 2013-2017 | |
| # Distributed under the Boost Software License, Version 1.0. | |
| # (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) | |
| language: c++ | |
| sudo: false | |
| # Do not build branches of the form "pr/*". By prefixing pull requests coming | |
| # from branches inside the repository with pr/, this avoids building both the | |
| # branch push _and_ the pull request. |
| #!/bin/bash | |
| cat << EOF >> $HOME/.bashrc | |
| export PATH="\$HOME/.local/bin:\$HOME/.cabal/bin:/opt/ghc/7.10.2/bin:/opt/cabal/head/bin:\$PATH" | |
| alias tmux="tmux -2" | |
| EOF | |
| cat << EOF > $HOME/.gitconfig |
| Shuffle Linked List | |
| Delete duplicate characters | |
| Use 3 types of different data structure to delete a list of objects | |
| Reverse the string | |
| What are you going to learn next? | |
| How to reverse a string | |
| Why Microsoft? Why not ***** company? | |
| Tell me about yourself? Weakness/Strength/etc. | |
| How would you implement a caching proxy server ? | |
| Say you’re a cobbler and I want to buy a pair of shoes… what would you do? |
| s='is_tokenized_Firstname:TKN_NAME is_tokenized_Last_Name:TKN_NAME' | |
| read -r -a words_in <<<"$s" # Read words into array | |
| for word in "${words_in[@]}"; do # Iterate over input | |
| [[ $word = is_tokenized_*:TKN* ]] && { # Check for match | |
| word=${word#is_tokenized_} # Strip prefixes | |
| word=${word%:TKN*} # Strip suffixes | |
| } | |
| printf '%s ' "$word" # Write output | |
| done | |
| printf '\n' |
| #include <memory> | |
| // compiler calculates concrete number but it is not compile time constant | |
| int main() { | |
| // statefull lambda object next_fib_num | |
| auto next_fib_num = [i=0, j=1]() mutable { | |
| i = std::exchange(j, j+i); | |
| return i; | |
| }; | |
| next_fib_num(); |
| # swap 2 values | |
| old = "old" | |
| new = "new" | |
| old, new = new, old | |
| print( old, new) | |
| # formatting | |
| character = 'Neo' | |
| movie = 'Matrix' |
| //http://melpon.org/wandbox/permlink/YtEl1NtqNHgULC9X | |
| #include <utility> | |
| template <char... chars> | |
| using CharSeq = std::integer_sequence<char, chars...>; | |
| template <typename T, T... chars> | |
| constexpr CharSeq<chars...> operator""_cts() { return { }; } | |
| //NOTE zero storage - only copiler data stractures encode the string, zero runtime overhead - data |