March 2012
Intermediate to advanced
244 pages
4h 42m
Chinese
Content preview from JavaScript 設計模式
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函式
87
轉換函式
schonfinkelize()
並不限於單個參數的轉換，也沒有只能 curry 化一次的限制。
這些是更多的使用方法：
使用 Currying 的時機
當你發現你呼叫某個函式時，傳入的參數大多都相同，則這個函式可能就是 currying 的優
良候選人。你可以用部分應用的方式，傳入一些參數給函式，並動態產生新的函式。新函
式可以幫你保留重複的那些參數，於是你就不必每次都傳遞，並用它們預先填入原始函式
預期接受的完整參數列。[83]
總結
在 JavaScript 中，函式的知識和正確的使用是關鍵。本章討論了函式的背景知識和相關的
術語，你學到了 JavaScript 函式的兩個重要特色，那就是：
1. 函式是第一級物件；它們可以和值一樣作為參數傳遞，也可以擴充屬性和方法。
2. 函式提供了區域作用域，而大括號產生的區塊則沒有。同時要銘記在心，區域變數
的宣告會被提升（hoisted）至區域作用的頂端。
建立函式的語法包括了：
1. 具名函式表示式
2. 函式表示式，和上一個相同，只是缺少名字，也稱作匿名函式
3. 函式宣告式，類似其
他語言的函式語法
一個普通的函式
可以轉換任何數量的參數
兩步驟的 currying 也行
88
第四章
在學會函式的背景知識和語法之後，你學到
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