djleonskennedy

-- The Y combinator, discovered by Haskell B. Curry, is defined as: Y = \f.(\x.f (x x)) (\x. f (x x))
-- haskell

newtype Mu a = Mu (Mu a -> a)
y f = (\h -> h $ Mu h) (\x -> f . (\(Mu g) -> g) x $ x)


-- javascript
const factSource = partial => n => n === 0 ? 1 : n * partial(n - 1);

djleonskennedy

import Data.Functor.Contravariant

-- newtype Predicate a = Predicate { getPredicate :: a -> Bool }

--instance Contravariant Predicate where
--   contramap f (Predicate p) = Predicate (p . f)
--                                              |   `- First, map the input...
--                                          `----- then apply the predicate.

fb = Predicate (\x -> x > 20)

djleonskennedy

// compose
const compose = (...fns) => x => 
  fns.reduceRight((v, f) => f(v), x);

/*
const toSlug = compose(
  encodeURIComponent,
  join('-'),
  map(toLowerCase),
  split(' ')

djleonskennedy

I had the same issue but manually triggering configure script 
```(cd ./node_modules/react-native/third-party/glog-0.3.4 && ../../scripts/ios-configure-glog.sh)``` resolves it.

Also - If you want to build app for iOS 12 you have to switch path to the active developer directory 
```(xcode-select -s /Applications/Xcode-beta.app/Contents/Developer).```

djleonskennedy

import { Component } from '@angular/core';
import { async, TestBed } from '@angular/core/testing';
import { FormControl, FormGroup, ReactiveFormsModule } from '@angular/forms';
import { By } from '@angular/platform-browser';
import { SyncControlDirective } from './sync-control.directive';

class FormGroupHostComponent {
  formGroup = new FormGroup({
    ctrl: new FormControl('')
  });

djleonskennedy

-- Left identity
-- return x >>= f 'same as' f x

return 3 >>= (\x -> Just (x+100000))  
-- Just 100003  
(\x -> Just (x+100000)) 3  
-- Just 100003 


-- Right identity

djleonskennedy

// Typescript
class Identity {
  constructor(private x: any) {
  }
  map(f: Function): any {
    this.x = f(this.x);
  }
}

const id = new Identity(2);

djleonskennedy

// Recursive:

const factorial = n => 
  n < 2 
    ? 1
    : n * factorial(n-1);


// Tail-recursive:

djleonskennedy

requirejs.config({
    paths: {
        ramda: '../Scripts/vendor/ramda.min',
        jquery: '../Scripts/vendor/jquery-1.12.4.min',
    }
});

require(['ramda', 'jquery'], function (R, $) {

     $.ajaxSetup({

djleonskennedy

// TS
const randomColorGenerator = (): string =>
  `#${(Math.random().toString(16) + '0000000').slice(2, 8)}`;

// ES6
const randomColorGenerator = () =>
  `#${(Math.random().toString(16) + '0000000').slice(2, 8)}`;

// ES5
var randomColorGenerator = function () {