1.txt

CASE WHEN是：
一种复杂的选择语句, 相比于 #IF 有更丰富的特性。
完整的选择语句需要包含至少一项选择分支, 也就是 {when block}。

每个标准的选择分支由 {when} {{条件}} -> {{表达式}} 组成。
也可使用 {else} {{表达}} 作为默认分支。

{先看一段示例:}
set number to 3
set numberProvided to case &number [
    when 1 -> "One"
    when 2 -> "Two"
    when 3 -> "Three"
    else "One"
]
log inline "You provide {{ &numberProvided }}"

{运行后得到结果:}
You provide Three

{也可以像其他语句一样正常使用:}
set number to 3
case &number [
    when 1 -> log "One"
    when 2 -> log "Two"
    when 3 -> log "Three"
    else log "One"
]

{或是包含多条语句:}
set number to 1
case &number [
    when 1 -> {
        log "Monday"
        log "First day of the week"
    }
    when [ 2 3 4 5 6 7 ] -> {
        log "Sunday"
    }
    else log "Other days"
]

{或是进行逻辑判断:}
set number to 1
case &number [
    when < 10 -> {
        log "Small"
    }
    when > 10 -> {
        log "Big"
    }
    else log "Other"
]