CoffeeScript 字符串 - localeCompare()

描述

此方法接受一个字符串，并将其与调用字符串对象进行比较。如果两者相等，它返回 0；否则返回 -1 或 1。并且如果按本地浏览器语言按升序排列，作为参数传递的字符串在其前面，它返回 1；并且如果按升序排列，调用字符串在其前面，则返回 -1。

语法

下面给出了 JavaScript 的 localeCompare() 方法的语法。我们可以从 CoffeeScript 代码中使用相同的方法。

string.localeCompare( param )

示例

以下示例演示了如何在 CoffeeScript 代码中使用 JavaScript 的 localeCompare() 方法。将此代码保存在名为 string_localecompare.coffee 的文件中

str1 = "This is beautiful string"
str2 = "This is beautiful string"
str3 = "abcd"
str4 = "xyz"
console.log "The value of str1:: "+str1
console.log "The value of str2:: "+str2
console.log "The value of str3:: "+str3
console.log "comparing the strings str1 and str2 ::"

index = str1.localeCompare str2
switch index
   when 0 then console.log "Both strings are equal"
   when 1 then console.log "Both strings are not equal and the string passed as parameter will be first in the sorted order."
   when -1 then console.log "Both strings are not equal and the calling string object will be first in the sorted order."
   
   
console.log "comparing the strings str1 and str3 ::"
index = str1.localeCompare str3
switch index
   when 0 then console.log "Both strings are equal"
   when 1 then console.log "Both strings are not equal and the string passed as parameter will be first in the sorted order."
   when -1 then console.log "Both strings are not equal and the calling string object will be first in the sorted order."

console.log "comparing the strings str1 and str4 ::"
index = str1.localeCompare str4
index = str1.localeCompare str3
switch index
   when 0 then console.log "Both strings are equal"
   when 1 then console.log "Both strings are not equal and the string passed as parameter will be first in the sorted order."
   when -1 then console.log "Both strings are not equal and the calling string object will be first in the sorted order."

打开 命令提示符 并编译 .coffee 文件，如下所示。

c:\> coffee -c string_localecompare.coffee

在编译时，它会给你以下 JavaScript。

// Generated by CoffeeScript 1.10.0
(function() {
  var index, str1, str2, str3, str4;

  str1 = "This is beautiful string";

  str2 = "This is beautiful string";

  str3 = "abcd";

  str4 = "xyz";

  console.log("The value of str1:: " + str1);

  console.log("The value of str2:: " + str2);

  console.log("The value of str3:: " + str3);

  console.log("comparing the strings str1 and str2 ::");

  index = str1.localeCompare(str2);

  switch (index) {
    case 0:
      console.log("Both strings are equal");
      break;
    case 1:
      console.log("Both strings are not equal and the string passed as parameter will be first in the sorted order.");
      break;
    case -1:
      console.log("Both strings are not equal and the calling string object will be first in the sorted order.");
  }

  console.log("comparing the strings str1 and str3 ::");

  index = str1.localeCompare(str3);

  switch (index) {
    case 0:
      console.log("Both strings are equal");
      break;
    case 1:
      console.log("Both strings are not equal and the string passed as parameter will be first in the sorted order.");
      break;
    case -1:
      console.log("Both strings are not equal and the calling string object will be first in the sorted order.");
  }

  console.log("comparing the strings str1 and str4 ::");

  index = str1.localeCompare(str4);

  index = str1.localeCompare(str3);

  switch (index) {
    case 0:
      console.log("Both strings are equal");
      break;
    case 1:
      console.log("Both strings are not equal and the string passed as parameter will be first in the sorted order.");
      break;
    case -1:
      console.log("Both strings are not equal and the calling string object will be first in the sorted order.");
  }

}).call(this);

现在，再次打开 命令提示符，并运行 CoffeeScript 文件，如下所示。

c:\> coffee string_localecompare.coffee 

在执行时，CoffeeScript 文件产生以下输出。

The value of str1:: This is beautiful string
The value of str2:: This is beautiful string
The value of str3:: abcd
comparing the strings str1 and str2 ::
Both strings are equal
comparing the strings str1 and str3 ::
Both strings are not equal and the string passed as parameter will be first in the sorted order.
comparing the strings str1 and str4 ::
Both strings are not equal and the string passed as parameter will be first in the sorted order.