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Async/Await for Swift

• Proposal: SE-XXXX
• Authors: Chris Lattner, Joe Groff

Introduction

Modern Cocoa development involves a lot of asynchronous programming using closures and completion handlers, but these APIs are hard to use. This gets particularly problematic when many asynchronous operations are used, error handling is required, or control flow between asynchronous calls gets complicated. This proposal describes a language extension to make this a lot more natural and less error prone.

This paper introduces a first class Coroutine model to Swift. Functions can opt into to being async, allowing the programmer to compose complex logic involving asynchronous operations, leaving the compiler in charge of producing the necessary closures and state machines to implement that logic.

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package main

import (
	"fmt"
	"github.com/siddontang/go-mysql/client"
	"github.com/siddontang/go-mysql/mysql"
	"github.com/siddontang/go-mysql/replication"
	"os"
)

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package main

import (
	"fmt"
	"log"
	"net"
	"os"
	"strconv"
	"time"
)

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# Delete remote branches already merged with development
git branch -a --merged | grep -v "\*" | grep -v master | grep -v main | grep -v develop | cut -d'/' -f 3-4 | xargs -n 1 -I {} git push origin :{}

# Delete local merged branches
git branch --merged | grep -v "\*" | grep -v master | grep -v main | grep -v dev | xargs -n 1 -I {} git branch -d {}

# Delete local squashed branches DANGEROUS https://github.com/not-an-aardvark/git-delete-squashed
git for-each-ref refs/heads/ "--format=%(refname:short)" | while read branch; do mergeBase=$(git merge-base master $branch) && [[ $(git cherry master $(git commit-tree $(git rev-parse $branch\^{tree}) -p $mergeBase -m _)) == "-"* ]] && git branch -D $branch; done

# Delete all local branches except main

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# Remove all untagged images
docker rmi $(docker images | grep "^<none>" | awk '{print $3}')
# Remove all unused images
docker images -q |xargs docker rmi

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%% @doc Optimized HEX encoder.
%% Source http://stackoverflow.com/questions/3768197/erlang-ioformatting-a-binary-to-hex
-module(bin_to_hex).

-compile([native, {hipe, [o3]}]).

-export([bin_to_hex/1]).

bin_to_hex(B) when is_binary(B) ->
  bin_to_hex(B, <<>>).

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#!/usr/bin/env escript

-record(ecsv,{
state = field_start, %%field_start|normal|quoted|post_quoted
cols = undefined, %%how many fields per record
current_field = [],
current_record = [],
fold_state,
fold_fun %%user supplied fold function
}).

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package main

import (
	"errors"
	"fmt"
	"github.com/dgrijalva/jwt-go"
	"time"
)

type User struct {

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#!/usr/bin/env escript

main([NS, SL]) ->
    try
        N = list_to_integer(NS),
        List = eval(SL),
        io:format("Result: ~p~n", [random(List,N)])
    catch
        _:_ ->
            usage()

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date_to_integer_iso8601({date,{Y,M,D}}) ->
    datetime_to_integer_iso8601({datetime,{{Y,M,D},{0,0,0}}}).
datetime_to_integer_iso8601({datetime,{{Y,M,D},{H,Min,S}}}) ->
    Y * 10000000000 + M * 100000000 + D * 1000000 + H * 10000 + Min * 100 + S.