独立于哪种编程语言，有哪些选项可以缩短具有许多类似情况的长切换语句？
从我搜索过的内容中，我找到了this one之类的答案，但我的情况都不同，只有一个整数在循环中发生变化。
我经常在bash / PHP / Python / JavaScript中使用以下switch语句构造，并且正在寻找更短的版本：
switch ($device) {
// 2ghz
case "n2":
return 1;
break;
case "nne2":
return 2;
break;
case "ne2":
return 3;
break;
case "ene2":
return 4;
break;
case "e2":
return 5;
break;
case "ese2":
return 6;
break;
case "se2":
return 7;
break;
case "sse2":
return 8;
break;
case "s2":
return 9;
break;
case "ssw2":
return 10;
break;
case "sw2":
return 11;
break;
case "wsw2":
return 12;
break;
case "w2":
return 13;
break;
case "wnw2":
return 14;
break;
case "nw2":
return 15;
break;
case "nnw2":
return 16;
break;
// 5ghz
case "n5":
return 17;
break;
case "nne5":
return 18;
break;
case "ne5":
return 19;
break;
case "ene5":
return 20;
break;
case "e5":
return 21;
break;
case "ese5":
return 22;
break;
case "se5":
return 23;
break;
case "sse5":
return 24;
break;
case "s5":
return 25;
break;
case "ssw5":
return 26;
break;
case "sw5":
return 27;
break;
case "wsw5":
return 28;
break;
case "w5":
return 29;
break;
case "wnw5":
return 30;
break;
case "nw5":
return 31;
break;
case "nnw5":
return 32;
break;
// 24ghz
case "n24":
return 33;
break;
case "nne24":
return 34;
break;
case "ne24":
return 35;
break;
case "ene24":
return 36;
break;
case "e24":
return 37;
break;
case "ese24":
return 38;
break;
case "se24":
return 39;
break;
case "sse24":
return 40;
break;
case "s24":
return 41;
break;
case "ssw24":
return 42;
break;
case "sw24":
return 43;
break;
case "wsw24":
return 44;
break;
case "w24":
return 45;
break;
case "wnw24":
return 46;
break;
case "nw24":
return 47;
break;
case "nnw24":
return 48;
break;
default:
return 0;
break;
}
答案 0 :(得分：3)
在Python中，如果你的返回值很简单，你就可以使用这么简单的东西：
items = ["n2","nne2","ne2","ene2", ...]
for idx, key in enumerate(items, start=1):
if device == key:
result = idx
result = 0
或者，如果您希望返回值更复杂：
my_dict = {
"n2": 1,
"nne2": 2,
"ne2": 3,
"ene2": 4,
...}
for key, value in my_dict.items():
if device == key:
result = value
result = 0
答案 1 :(得分：2)
在JavaScript中：
var cases = {
"n2" : 1,
"nne2" : 2,
"ne2" : 3,
"ene2" : 4,
"e2" : 5,
"ese2" : 6,
// and so on
};
var myCase = cases[$device] || 0;
答案 2 :(得分：1)
尝试使用PHP
function yourFunction($devices) {
$array = ["n2","nne2","ne2","ene2","e2","ese2","se2","sse2","s2","ssw2","sw2","wsw2"];
if($key = array_search($devices, $array))
return $key+1;
}
答案 3 :(得分：1)
我建议使用带有bash的索引数组：
declare -A a=([n2]='1' [nne2]='2' [ne2]='3')
device="nne2"
return "${a[$device]}" # returns with value 2
答案 4 :(得分：0)
使用数组存储＆＃39;个案＆＃39;作为键并返回值作为值。 然后，可以检查数组中是否存在给定的键。如果是，则返回其值，否则返回默认值。
答案 5 :(得分：0)
我不知道php所以这是在python：
devices = ["n2", "nne2" ...] # populate it with your devices
...
def foo(device):
if device in devices:
return devices.index(device) + 1
else:
return 0
答案 6 :(得分：0)
如果订购号码。没有比使用数组索引更好的方法了。
另一方面，如果值不同，可以使用字典/ HashMap /关联数组的简单实现来完成解决方案。
在Python中，您可以使用字典，如下所示
keyList = ['n2','nne2',...]
valueList = [1, 2, 3, ...] # Must be same size as keyList
# Best to assign both the above lists
# with files if there are 50+ entries
deviceDict = {}
for i in range(len(keyList)):
deviceDict[keyList[i]] = valueList[i]
答案 7 :(得分：0)
如果您需要独立于任何特定编程语言的解决方案，您可以尝试 JSON （ Javascript Object Notation ）。
尽管名称如此， JSON 是一种与语言无关，基于文本的数据交换格式，非常类似于XML，CSV（或YAML）。
与语言无关， JSON 不仅可以通过Javascript进行查询和处理，还可以通过Java，Python，PHP和许多其他语言进行查询和处理。
多种语言可以引用和处理相同的 JSON 数据。
问题中数据的 JSON 示例：
{
"2ghz": {
"n2": 1,
"nne2": 2,
"ne2": 3,
"ene2": 4,
"e2": 5,
"ese2": 6,
"se2": 7,
"sse2": 8,
"s2": 9,
"ssw2": 10,
"sw2": 11,
"wsw2": 12,
"w2": 13,
"wnw2": 14,
"nw2": 15,
"nnw2": 16
},
"5ghz": {
"n5": 17,
"nne5": 18,
"ne5": 19,
"ene5": 20,
"e5": 21,
"ese5": 22,
"se5": 23,
"sse5": 24,
"s5": 25,
"ssw5": 26,
"sw5": 27,
"wsw5": 28,
"w5": 29,
"wnw5": 30,
"nw5": 31,
"nnw5": 32,
},
"24ghz": {
"n24": 33,
"nne24": 34,
"ne24": 35,
"ene24": 36,
"e24": 37,
"ese24": 38,
"se24": 39,
"sse24": 40,
"s24": 41,
"ssw24": 42,
"sw24": 43,
"wsw24": 44,
"w24": 45,
"wnw24": 46,
"nw24": 47,
"nnw24": 48
}
}
答案 8 :(得分：0)
非常感谢您的贡献，我可以提出以下示例。我希望它们是语言的最短变体，如果没有，请随时编辑/更正。
Python dev2host.py：
#!/usr/bin/env python
def dev2host(device):
devices = [
"n2", "nne2", "ne2", "ene2", "e2", "ese2", "se2", "sse2", "s2", "ssw2", "sw2", "wsw2", "w2", "wnw2", "nw2", "nnw2", # 2ghz
"n5", "nne5", "ne5", "ene5", "e5", "ese5", "se5", "sse5", "s5", "ssw5", "sw5", "wsw5", "w5", "wnw5", "nw5", "nnw5", # 5ghz
"n24", "nne24", "ne24", "ene24", "e24", "ese24", "se24", "sse24", "s24", "ssw24", "sw24", "wsw24", "w24", "wnw24", "nw24", "nnw24", # 24ghz
]
for host, key in enumerate(devices, start=1):
if device == key:
print host
result = 0
return;
dev2host("ne5")
PHP dev2host.php：
<?php
function dev2host($device) {
$devices = [
"n2", "nne2", "ne2", "ene2", "e2", "ese2", "se2", "sse2", "s2", "ssw2", "sw2", "wsw2", "w2", "wnw2", "nw2", "nnw2", // 2ghz
"n5", "nne5", "ne5", "ene5", "e5", "ese5", "se5", "sse5", "s5", "ssw5", "sw5", "wsw5", "w5", "wnw5", "nw5", "nnw5", // 5ghz
"n24", "nne24", "ne24", "ene24", "e24", "ese24", "se24", "sse24", "s24", "ssw24", "sw24", "wsw24", "w24", "wnw24", "nw24", "nnw24", // 24ghz
];
if ($host = array_search($device, $devices)) {
return $host+1;
}
}
echo dev2host("ne5");
?>
Bash dev2host.sh：
#!/bin/bash
function dev2host() {
declare -A devices=(
[n2]='1' [nne2]='2' [ne2]='3' [ene2]='4' [e2]='5' [ese2]='6' [se2]='7' [sse2]='8' # 2ghz
[s2]='9' [ssw2]='10' [sw2]='11' [wsw2]='12' [w2]='13' [wnw2]='14' [nw2]='15' [nnw2]='16' # 2ghz
[n5]='17' [nne5]='18' [ne5]='19' [ene5]='20' [e5]='21' [ese5]='22' [se5]='23' [sse5]='24' # 5ghz
[s5]='25' [ssw5]='26' [sw5]='27' [wsw5]='28' [w5]='29' [wnw5]='30' [nw5]='31' [nnw5]='32' # 5ghz
[n24]='33' [nne24]='34' [ne24]='35' [ene24]='36' [e24]='37' [ese24]='38' [se24]='39' [sse24]='40' # 24ghz
[s24]='41' [ssw24]='42' [sw24]='43' [wsw24]='44' [w24]='45' [wnw24]='46' [nw24]='47' [nnw24]='48' # 24ghz
)
echo "${devices[$1]}"
}
dev2host ne5
Javascript dev2host.js：
function dev2host($device) {
var devices = {
"n2":1, "nne2":2, "ne2":3, "ene2":4, "e2":5, "ese2":6, "se2":7, "sse2":8, // 2ghz
"s2":9, "ssw2":10, "sw2":11, "wsw2":12, "w2":13, "wnw2":14, "nw2":15, "nnw2":16, // 2ghz
"n5":17, "nnw5":18, "ne5":19, "ene5":20, "e5":21, "ese5":22, "se5":23, "sse5":24, // 5ghz
"s5":25, "ssw5":26, "sw5":27, "wsw5":28, "w5":29, "wnw5":30, "nw5":31, "nnw5":32, // 5ghz
"n24":33, "nnw34":34, "ne24":35, "ene24":36, "e24":37, "ese24":38, "se24":39, "sse24":40, // 24ghz
"s24":41, "ssw24":42, "sw24":43, "wsw24":44, "w24":45, "wnw24":46, "nw24":47, "nnw24":48, // 24ghz
};
var host=devices[$device] || 0;
return host;
}
document.write(dev2host("ne5"));