Yoshiki Shibukawa shibukawa

Abstract

I don't think this generics/contract proposals have enough advantages. I am against them.

Why Generics is needed

For a long period, many people have wanted generics for the following purposes:

Avoid type casting from interface{} (as this proposal mentioned).
Improve performance (like C++'s specization feature like this).

Basically, error handling code and regular code have different purpose/aspect. So splitting error handling code from regular code is just introducing some type of "goto" structure essentially.

I like handle/check work locally inside function and are resticted not to escape between functions unlike exception are good point. But I think this design proposal may create a very complicated structure。

If there is only one handle per scope ({ }), it is resonable, but there are many handles and/or have defers in same scope, make code difficult. If we have to control error handling finely, error handling code and regular code are mixed like bunch of if err != nil sentences.

	>>> a = [ 9, 5, 4, 2, 1]
	>>> b = [ 2, 4, 7, 8, 10]
	>>> def sortset(s, a):
	... return sorted(s, key=lambda e: a.index(e))
	...
	>>> sortset(set(a) - set(b), a + b)
	[9, 5, 1]
	>>> sortset(set(b) - set(a), a + b)
	[7, 8, 10]

	https://twitter.com/y_cony/status/1098757985487048704

	いいリーダーの共通点

	・朝の「おはよう」を先に言う
	・忙しそうに見えない
	・まずは周りに与える
	・話を黙って最後まで聴く
	・会議の終了時間を死守する
	・叱るときは冷静に、褒めるときは感情的に

	commit 839b0d941e962c9b902804312f301700ba203d98
	Author: Yoshiki Shibukawa <>
	Date: Fri Jun 30 11:02:26 2017 +0900

	追加し忘れていたサンプルを追加

	commit f95422007bf5689ccfeefa1812916209b4af6485
	Merge: 252df5f 268f8bc
	Author: Akihiro Takizawa <>
	Date: Fri Jun 16 10:30:13 2017 +0900


	interface ICommonColumn<T> {
	width?: number \| string;
	minWidth?: number \| string;
	maxWidth?: number \| string;
	caption?: string;
	style?: IStyle \| styleFunction<T>;
	padding?: string \| number[];
	textOverflow?: "clip" \| "ellipsis";
	action?: string;

	FROM node:latest as builder

	ADD src src
	WORKDIR src
	RUN npm install && \
	npm run build

	FROM node:alpine as runner

	COPY src/package.json .

	package main

	import (
	"testing"
	"math/rand"
	)

	type Mat32_32 [6]float32

	func NewMat32_32() *Mat32_32 {

	package main

	import (
	"fmt"
	"log"
	"net/http"
	"strings"
	"time"
	)

Yoshiki Shibukawa shibukawa

Abstract

Why Generics is needed

My suggestion