CoffeeScript - 比較運算子

JavaScript 支援以下比較運算子。假設變數A值為10，變數B值為20，則：

示例

以下程式碼演示如何在 CoffeeScript 中使用比較運算子。將此程式碼儲存到名為comparison_example.coffee的檔案中。

a = 10
b = 20
console.log "The result of (a == b) is "
result = a == b
console.log result

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

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

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

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

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

開啟命令提示符並編譯 comparison_example.coffee 檔案，如下所示。

c:/> coffee -c comparison_example.coffee

編譯後，將生成以下 JavaScript 程式碼。

// Generated by CoffeeScript 1.10.0
(function() {
  var a, b, result;
  a = 10;
  b = 20;

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

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

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

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

  console.log("The result of (a >= b) is ");
  result = a <= b;
  console.log(result);

  console.log("The result of (a <= 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 comparison_example.coffee

執行後，CoffeeScript 檔案將產生以下輸出。

The result of (a == b) is
false
The result of (a < b) is
true
The result of (a > b) is
false
The result of (a != b) is
true
The result of (a >= b) is
true
The result of (a <= b) is
false