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mattecapu / equiv_of_sums.lagda
Last active Jun 22, 2019
Proof of equivalence for two definitions of sum.
View equiv_of_sums.lagda
# Proof of equivalence for two definitions of sum
\begin{code}
module equiv_of_sums where
import Relation.Binary.PropositionalEquality as Eq
open Eq using (_≡_; refl; cong; sym)
open Eq.≡-Reasoning using (begin_; _≡⟨⟩_; _≡⟨_⟩_; _∎)
data ℕ : Set where
@mattecapu
mattecapu / c_cheatsheet.c
Last active Jan 18, 2017
List of commonly used idioms
View c_cheatsheet.c
// alias type to new_name
typedef type new_name;
// declare an array
int vector[SIZE];
// declare an array, size undetermined
int vector[] = { 3, 4 };
void read_str( char s[] );
// main signature
View library.jsx
export default class Library extends React.Component {
static getFragment() {
return Lokka.getFragment(`
fragment on Library {
name
}
`);
}
render() {
View app.jsx
import Library from '../components/library';
export default class App extends React.Component {
static async getInitialProps() {
return await Lokka.query(`{
libraries {
id,
...${Library.getFragment()}
}
}`);
View lokka_singleton.js
import { Lokka } from 'lokka';
import { Transport } from 'lokka-transport-http';
import { SERVER_URL } from '../config';
/* singleton Lokka client */
export default new Lokka({
transport: new Transport(`${SERVER_URL}/graphql`)
});
View .babelrc
{
"presets": [
"next/babel"
]
}
View build.json
"start": "node dist/server.js",
"clean": "rm -rf dist",
"prebuild": "npm run clean && mkdir dist && cp -r src/** dist/",
"build": "babel src --ignore pages/*,components/* -d dist && next build dist",
View koa.sh
yarn add koa@2 koa-graphql koa-router@next koa-convert --exact
View graphql.sh
yarn add graphql lokka lokka-transport-http --exact
View seq.sh
yarn add sequelize pg pg-hstore --exact
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