programming languages by 华盛顿大学 Courseras

SML

• SML Syntax Cheatsheet
• The Standard ML Basis Library

查看某个标准库函数可以直接在sml里输入

- String.sub
= ;
[autoloading]
[autoloading done]
val it = fn : string * int -> char

- apt install smlnj mlton polyml

运行
- sml、poly 交互
- polyc hello2.sml -o hello2 编译

Racket

• Quick: An Introduction to Racket with Pictures
• The Racket Guide

- sudo add-apt-repository ppa:plt/racket
- sudo apt-get install racket

Run
racket 

Ruby