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package main | |
import "fmt" | |
var allMasses []int = []int{ | |
147308, 51605, 71317, 110882, 92545, 126856, 104937, 92433, 107850, 119538, 82733, 52216, 105704, 123682, 105919, 136265, 100540, 84245, 72006, 111652, 85116, 85841, 71374, 144196, 125493, 113529, 64637, 87489, 138161, 120897, 53384, 83310, | |
120672, 126144, 107681, 101369, 77469, 141056, 140426, 114920, 124454, 130867, 64611, 104813, 138808, 114234, 148654, 59031, 91367, 83316, 106192, 127495, 139980, 119024, 149567, 57007, 61075, 65637, 75293, 61670, 104044, 77230, 80201, | |
137094, 99733, 50801, 68922, 148404, 79980, 62716, 67666, 72694, 81951, 108427, 111721, 55532, 94442, 88562, 101088, 111656, 111649, 92085, 91730, 114744, 59355, 55842, 100926, 146370, 147829, 62160, 91447, 115745, 141815, 106837, 68151, | |
89077, 60357, 89856, 75040, 139131, | |
} |
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# Take all numbers from 0 to 50 million and sum every number from 0 to that number and sum those numbers | |
:timer.tc fn -> | |
1..50_000_000 | |
|> Enum.map(& Enum.sum(0..&1)) | |
|> Enum.sum() | |
end | |
# Takes almost 2 minutes to run and returns the value 20,833,345,833,335,000,000 | |
# => {108521694, 20833334583333350000000} | |
# Using task async stream, this can be done concurrently easily by just |
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{} + "" == "()" // true | |
pow(2, 31).intValue + 1 > 0 // false | |
Set(1,2,3).sameElements(Set(3,2,1)) // false | |
Some(null).get // No exception :(, Some(null) should result in a None IMO | |
// Option objects might be null!!! | |
def safeOption(shouldBeSafe : Option[String]) : String = { |
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# prices = [11, 7, 5, 8, 10, 9] | |
# => 5 | |
# ALGO 1: BRUTE FORCE | |
# for each map to profit, find biggest number | |
# 11 => [-4, -6, -3, -1, -2] | |
# 7 => [-2, 1, 3, 2] | |
# 5 => [3, 5, 4] | |
# 8 => [2, 1] | |
# 10 => [-1] | |
# |
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defmodule Ecto.Polymorphic do | |
defmacro __using__(_) do | |
quote do | |
require Ecto.Schema | |
import Ecto.Schema, except: [belongs_to: 2, belongs_to: 3] | |
import unquote(__MODULE__) | |
end | |
end |
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# Assuming we have some code like this | |
defmodule Processor do | |
# A lot of code uses the following format, and its a good way to write code | |
# However, when we have potential failures at each step things get complicated | |
def process(user, meta) do | |
user | |
|> verify_authenticity(meta[:credentials]) | |
|> process_payment(meta[:charges]) | |
|> issue_resource | |
|> generate_response |
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$ mix new policy_enforcement_playground | |
$ cd policy_enforcement_playground | |
# Make a new file lib/authorization.ex | |
defmodule Authorization do | |
def authorize_first_thing(_user, resource) do | |
# Do some authorization here, modifying what gets returned based on the | |
# authorization level of the user | |
resource | |
end |
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# Elixir has lazily evaluated enumerable objects that allow you | |
# to work with enumerable objects like lists either only as needed | |
# or infinitely. | |
# Start up iex to play around | |
$ iex | |
# Typical enumeration is done eagerly where the result is computed ASAP | |
iex> Enum.map(1..10, fn i -> i * 2 end) | |
[2, 4, 6, 8, 10, 12, 14, 16, 18, 20] |
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# The golden trinity of Erlang is the secret sauce behind what makes | |
# Elixir a strong choice for any backend application and/or system. | |
# https://tkowal.wordpress.com/2015/10/20/failing-fast-and-slow-in-erlang-and-elixir/ | |
# The supervision and worker system, commonly referred to as OTP (Open | |
# Telecom Platform, which has nothing to do with telephony), is what | |
# gives Erlang/Elixir applications them a robust "self-healing" type | |
# property that makes them extremely fault tolerant. |
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# To show hot code uploading, we first need to build a simple phoenix project so we can see it happen in real time. | |
# Start by making a new phoenix project | |
$ mix phoenix.new hotcode | |
# Go into the directory | |
$ cd hotcode | |
# Add exrm dependency to mix.exs file | |
{:exrm, "~> 1.0.3"} |
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