javascript - 是否有可能以某种方式缩短 switch 语句？也许有一个循环？

Question

无论使用哪种编程语言，有哪些选项可以缩短具有许多类似情况的长 switch 语句？

根据我的搜索，我找到了类似 this one 的答案但我的情况各不相同，只有一个整数在循环中变化。

我经常在 bash/PHP/Python/JavaScript 中使用以下 switch 语句构造，我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;
}

Answer 1

在 Python 中你可以使用像这样简单的东西，如果你的返回值很简单的话:

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