tk3369

Working with a hierarchy of builders that builds objects from a class hierarchy

I have a class hierarchy in which every class has some defined properties. I want to use builder pattern for all of these classes. Since the classes are set up in a hierachy, ideally I would do the same with the builders. The build function can validate its parts before constructing the concrete object. This guarantees that all necessary invariants are met.

Primary design

tk3369

input() = """22243
11899

1696
2595
5331
6092
5274
5641
1345

tk3369

 Warning: Sending message failed
│   exception =
│    IOError(EOFError() during request(https://discord.com/api/v10/channels/997765767053459520/messages))
│ 
│    Stacktrace:
│      [1] read_to_buffer(t::HTTP.ConnectionPool.Transaction{MbedTLS.SSLContext}, sizehint::Int64)
│        @ HTTP.ConnectionPool ~/.julia/packages/HTTP/aTjcj/src/ConnectionPool.jl:275
│      [2] readuntil(t::HTTP.ConnectionPool.Transaction{MbedTLS.SSLContext}, f::Function, sizehint::Int64)
│        @ HTTP.ConnectionPool ~/.julia/packages/HTTP/aTjcj/src/ConnectionPool.jl:294
│      [3] readuntil

tk3369

The following are valid timezones that can be used for JuliaCon bot's jc command.

Africa/Abidjan
Africa/Accra
Africa/Addis_Ababa
Africa/Algiers
Africa/Asmara
Africa/Asmera
Africa/Bamako
Africa/Bangui

tk3369

Define a function such that it only executes its body once. The value from first execution is memoized at the module level.

module X

export once
let x = Ref{Any}()
    global function once(f::Function)
 isassigned(x) && return x[]

tk3369

function stream_user_input(c::Channel)
    while true
        line = readline()
        if line == ""
            put!(c, ">>bye")
            break
        else
            put!(c, line)
        end
    end

tk3369

Hi SciML attendees,

We will use Discord as the primary chat platform during the conference.
The Humans of Julia community already has a server, so we will leverage the same server
and use a dedicated channel there (#scimlcon) for the SciML conference.

Please click on the link below to join the server:
https://discord.gg/PRqc3NehEr

For more information about the Discord platform, please visit their web site at https://discord.com/

tk3369

HoJBot lost connection to Discord

┌ Info: Reconnecting
│   time = 2022-02-24T04:58:52.571
│   conn = 29
│   resume = true
└   zombie = true
┌ Error: Getting gateway URL failed
│   time = 2022-02-24T04:59:51.869
│   exception =

tk3369

# Modified from @frank's code at Discord

function koch_curve!(X, Y, x1, y1, x2, y2, level)
    if level == 0
        push!(X, x1)
        push!(X, x2)
        push!(Y, y1)
        push!(Y, y2)
    else
        Δx = x2 - x1

tk3369

using BenchmarkTools

function apply_filter_jl(E, wx)
    Xest = 0.0 + 0.0im
    @inbounds for j = 1:size(E, 2)
        for i = 1:size(E, 1)
            Xest += E[i, j] * wx[i, j]'
        end
    end
    return Xest