gabejohnson

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gabejohnson

import { Right, Future, pipe, curry2, ifElse, isNotNil, memoize, chain, map } from "../fp"
// mssql.js
import sql from "mssql"

const createPoolAsync = memoize(connectionString =>
        new Future( ( reject, resolve ) => {
            const pool = new sql.ConnectionPool(
              connectionString,
              ifElse( isNotNil, reject, () => resolve( pool ) )
            );

gabejohnson

-- Potential solutions for multiple backend porting issues

-- 1. Optional PS implementation for optional foreign imports

-- JS has an implementation, Erlang would export bar instead
module Foo (foo) where

-- import `fooImpl` if it's provided by the host implementation
optional foreign import foo :: Number -> Number -> Number
-- define it otherwise

gabejohnson

import { class, interface, implements } from 'sweet-interfaces';

const constant = x => _ => x;
const identity = x => x;
const flip = f => (a, b) -> f(b, c);

interface Setoid {
  // eq :: Setoid a => a ~> a -> Boolean
  eq(b) { return this === b; }
}

gabejohnson

function Unit() { return Unit; }
function Pair(fst, snd) {
  'use strict';
  if(this === void 0) return new Pair(fst, snd);
  this.fst = fst;
  this.snd = snd;
}
Pair.prototype.map = //...
//...

gabejohnson

// Likely VERY inefficient port of Data.Trie
function Trie(a) {
    // could null be a valid value? if so, we can't use S.toMaybe
    this.value = S.toMaybe(a);
    this.children = {};
    this.ks = Object.freeze(this.value.isNothing ? [] : ['']);
};

/* Setoid */
// Trie a ~> Trie a -> Bool

gabejohnson

const alias = prefix => T => {
  const getKeys = o => Object.keys(o)
    .filter(k => k.startsWith(prefix+'/'))
    .map(k => k.split('/')[1]);
  
  const scaryMutateObject = o => getKeys(o).forEach(k => o[k] = o[prefix+'/'+k]);
  
  scaryMutateObject(T);
  scaryMutateObject(T.prototype);
  // I'M RETURNING UNDEFINED!!!

gabejohnson

const t = Table.of({a:1, b:2, c:3});
const t2 = Table.of({a:4, d:5});
const t3 = t.concat(t2).concat(Table.empty());

t3 // Table {a: 4, b: 2, c: 3, d: 5}
t3.head() // Object {a: 4, d: 5}
t3.tail() // Table {a: 1, b: 2, c: 3}
t3.append({b:6, e:7}) // Table {a: 4, b: 6, c: 3, d: 5, e: 7}
t3.reduce(x => x * x) // Object {a: 16, b: 4, c: 9, d: 25}
Table.empty().alt(t3) // t3

gabejohnson

function test(f) {
  var counter = 10000000;
  performance.clearMarks();
  performance.mark('StartTest');
  for(var i = counter; i > 0; --i) {
    f();
  }
  performance.mark('EndTest');
  var marks = performance.getEntriesByType('mark');
  return marks[1].startTime-marks[0].startTime;

gabejohnson

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