Seven More Languages in Seven Weeks （读书笔记）：Factor

Factor

IN: scratchpad 20 9 * 5.0 / 32 + .
Booleans：t/f
Sequences：{ { "one" 1 } { "two" 2 } { "three" 3 } { "four" 4 } } //注意空格
Quotations（匿名函数）：[ 42 + ]
call

条件语句
IN: scratchpad 10 0 > [ "pos" ] [ "neg" ] if .
或 IN: scratchpad 10 0 > "pos" "neg" ? .

Stack Shuffling
dup, drop, nip, swap, over, rot, pick

Higher-Order Words with Combinators
IN: scratchpad 44.50 [ 0.05 * ] [ 0.09975 * ] bi //见鬼
bi*
bi@
tri tri* tri@

Vocabularies
IN: scratchpad USE: present
IN: scratchpad SYMBOL: tax-rate //What the Fuck!
 : greeting ( name -- greeting ) "Hello, " swap append ; //定义一个库函数？IN: examples.greeter
 : hello-world ( -- ) "world" greeting print ; //USE: examples.greeter

Tuples
TUPLE: cart-item name price quantity ; //？类型没有声明
price>>（读）
>>price（写）
change-price

"Seven Languages Book" 25.00 1 cart-item boa //By Order of Arguments

标准库（字典）：略
IN: scratchpad "demos" run