joelnet

// works in a similar way to LINQ with some minor differences.

using System;
using System.Collections;
using System.Runtime.CompilerServices;

namespace MiniLinqApi
{
    [IgnoreNamespace]
    internal static class MiniLinq

joelnet

const user3 = {
  password: 'Password!',
  name: 'Naboo',
  id: 300
}

const organize = ({ password, ...object }) =>
  ({ ...object, password })
//              --------
//             /

joelnet

const user3 = {
  password: 'Password!',
  name: 'Naboo',
  id: 300
}

const organize = object => ({ id: undefined, ...object })
//                            -------------
//                          /
//  move id to the first property

joelnet

const user = { id: 100, name: 'Howard Moon'}
const userWithPass = { ...user, password: 'Password!' }

user //=> { id: 100, name: 'Howard Moon' }
userWithPass //=> { id: 100, name: 'Howard Moon', password: 'Password!' }

joelnet

const part1 = { id: 100, name: 'Howard Moon' }
const part2 = { id: 100, password: 'Password!' }

const user1 = { ...part1, ...part2 }
//=> { id: 100, name: 'Howard Moon', password: 'Password!' }

joelnet

const partial = { id: 100, name: 'Howard Moon' }
const user = { ...partial, id: 100, password: 'Password!' }

user //=> { id: 100, name: 'Howard Moon', password: 'Password!' }

joelnet

const setDefaults = ({ ...object}) => ({ quotes: [], ...object })

joelnet

#!/bin/bash

pidfile=$1
cmd=$2

if [ -z "$pidfile" ] || [ -z "$cmd" ]; then
  echo "Usage: once <pidfile> \"<command>\""
  exit 0
fi

joelnet

// S and K are primitive function combinators.
const S = a => b => c => a (c) (b (c))
const K = a => b => a

// Non-primitive combinators can be created with S and K.
const C = S (S (K (S (K (S)) (K))) (S)) (K (K))
const I = S (K) (K)
const KI = K (I)
const M = S (I) (I)
const R = S (K (S (K (S)) (K))) (S (K (S (I))) (K))

joelnet

/**
 * Demo for https://twitter.com/joelnet/status/1163820524709076992
 */

class Person {
  constructor(firstName, lastName) {
    this.firstName = firstName;
    this.lastName = lastName;
  }
}