joelnet

const pipe = require('ramda/src/pipe')
const curry = require('ramda/src/curry')

const clampA = (min, max, value) => {
  let newValue = Number(value)
  newValue = Math.min(max, newValue)
  newValue = Math.max(min, newValue)
  return newValue
}

joelnet

Keybase proof

I hereby claim:

• I am joelnet on github.
• I am joelnet (https://keybase.io/joelnet) on keybase.
• I have a public key ASBhE_5H8aJ_C-JIpSwxrk42nUN2c1I_f0Fe6jmlWphKhgo

To claim this, I am signing this object:

joelnet

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

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

joelnet

// Y Combinator
const Y = a => (b => b (b)) (b => a (c => b (b) (c)))

// isomorphic Church encoding/decoding
const Church = {
  to: n => f => x => Array.from (Array (n)).reduce (f, x),
  from: f => f (x => x + 1) (0)
}

const True = a => b => a

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

#!/bin/bash

pidfile=$1
cmd=$2

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

joelnet

const user = { id: 100, name: 'Howard Moon' }
const password = 'Password!'
const userWithPassword = {
  ...user,
  id: 100,
  ...(password && { password })
}

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

joelnet

const renamed = ({ ID, ...object }) => ({ id: ID, ...object })

const user = {
  ID: 500,
  name: "Bob Fossil"
}

renamed(user) //=> { id: 500, name: 'Bob Fossil' }

joelnet

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

joelnet

const user2 = {
  id: 200,
  name: 'Vince Noir'
}

const user4 = {
  id: 400,
  name: 'Bollo',
  quotes: ["I've got a bad feeling about this..."]
}