CoffeeScript - 邏輯運算子的別名

下表顯示了一些邏輯運算子的別名。假設變數X為true，變數Y為false。

示例

以下示例演示了在 CoffeeScript 中使用邏輯運算子別名。將此程式碼儲存在名為logical_aliases.coffee的檔案中。

a = true
b = false

console.log "The result of (a and b) is "
result = a and b
console.log result

console.log "The result of (a or b) is "
result = a or b
console.log result

console.log "The result of not(a and b) is "
result = not(a and b)
console.log result

開啟命令提示符並編譯 .coffee 檔案，如下所示。

c:\> coffee -c logical_aliases.coffee

編譯後，它會生成以下 JavaScript 程式碼。

// Generated by CoffeeScript 1.10.0
(function() {
  var a, b, result;
  a = true;
  b = false;

  console.log("The result of (a and b) is ");
  result = a && b;
  console.log(result);

  console.log("The result of (a or b) is ");
  result = a || b;
  console.log(result);

  console.log("The result of not(a and b) is ");
  result = !(a && b);
  console.log(result);

}).call(this);

現在，再次開啟命令提示符並執行 CoffeeScript 檔案，如下所示。

c:\> coffee logical_aliases.coffee

執行後，CoffeeScript 檔案會產生以下輸出。

The result of (a and b) is
false
The result of (a or b) is
true
The result of not(a and b) is
true