Feature/1 js 05 data type 03 string

1-js/05-data-types/03-string/1-ucfirst/solution.md

@@ -1,19 +1,19 @@
-We can't "replace" the first character, because strings in JavaScript are immutable.
+我們不能 "替換" 第一個字母，因為 Javascript 的字串是永遠不變的。
 
-But we can make a new string based on the existing one, with the uppercased first character:
+但我們可以根據已有的字串，創建一個首字母大寫的新字串：
 
 ```js
 let newStr = str[0].toUpperCase() + str.slice(1);
 ```
 
-There's a small problem though. If `str` is empty, then `str[0]` is `undefined`, and as `undefined` doesn't have the `toUpperCase()` method, we'll get an error.
+但仍然有個小問題。若 `str` 為空，則 `str[0]` 會是 `undefined`。而 `undefined` 不會有 `toUpperCase()` 方法，我們會得到錯誤。
 
-There are two variants here:
+有兩種處理方式：
 
-1. Use `str.charAt(0)`, as it always returns a string (maybe empty).
-2. Add a test for an empty string.
+1. 使用 `str.charAt(0)`，它會永遠回傳一個字串 (可能為空) 。
+2. 為空字串添加一個測試。
 
-Here's the 2nd variant:
+這是第二個作法：
 
 ```js run demo
 function ucFirst(str) {

1-js/05-data-types/03-string/1-ucfirst/task.md

@@ -2,9 +2,9 @@ importance: 5
 
 ---
 
-# Uppercase the first character
+# 首字母大寫
 
-Write a function `ucFirst(str)` that returns the string `str` with the uppercased first character, for instance:
+寫一個函式 `ucFirst(str)` ，它會將字串 `str` 回傳為首字母大寫的字串，例如：
 
 ```js
 ucFirst("john") == "John";

1-js/05-data-types/03-string/2-check-spam/solution.md

@@ -1,4 +1,4 @@
-To make the search case-insensitive, let's bring the string to lower case and then search:
+為了使檢索不區分大小寫，我們將字串都改為小寫再檢索：
 
 ```js run demo
 function checkSpam(str) {

1-js/05-data-types/03-string/2-check-spam/task.md

@@ -2,11 +2,11 @@ importance: 5
 
 ---
 
-# Check for spam
+# Check for spam 檢查 spam
 
-Write a function `checkSpam(str)` that returns `true` if `str` contains 'viagra' or 'XXX', otherwise `false`.
+寫一個函式 `checkSpam(str)` 若 `str` 包含 'vaigra' 或者 'XXX' 回傳 `true`，否則回傳 `false`
 
-The function must be case-insensitive:
+此函式必須是不區分大小寫：
 
 ```js
 checkSpam('buy ViAgRA now') == true

1-js/05-data-types/03-string/3-truncate/solution.md

@@ -1,6 +1,6 @@
-The maximal length must be `maxlength`, so we need to cut it a little shorter, to give space for the ellipsis.
+最大的長度必須是 `maxlength`，因此我們需將其剪短一點，為省略號留岀空間。
 
-Note that there is actually a single unicode character for an ellipsis. That's not three dots.
+注意，省略號實際上是一個單獨的 unicode 字元，那不是三個點。
 
 ```js run demo
 function truncate(str, maxlength) {

1-js/05-data-types/03-string/3-truncate/task.md

@@ -1,14 +1,14 @@
-importance: 5
+importance：5
 
 ---
 
-# Truncate the text
+# 截斷文字
 
-Create a function `truncate(str, maxlength)` that checks the length of the `str` and, if it exceeds `maxlength` -- replaces the end of `str` with the ellipsis character `"…"`, to make its length equal to `maxlength`.
+建立一個函式 `truncate(str, maxlength)`，它可以檢查該傳入字串 `str` 的長度，且若超過 `maxlength` -- 替換 `str` 結尾為省略號字元 `"..."`，使它的長度等於 `maxlength`。
 
-The result of the function should be the truncated (if needed) string.
+函式的結果應該是被截斷（如果有需要）的字串。
 
-For instance:
+例如：
 
 ```js
 truncate("What I'd like to tell on this topic is:", 20) = "What I'd like to te…"

1-js/05-data-types/03-string/4-extract-currency/task.md

@@ -2,13 +2,13 @@ importance: 4
 
 ---
 
-# Extract the money
+# 提取貨幣
 
-We have a cost in the form `"$120"`. That is: the dollar sign goes first, and then the number.
+我們以 `"$120"` 格式表示一個費用。即：首先為貨幣符號，然後是數字。
 
-Create a function `extractCurrencyValue(str)` that would extract the numeric value from such string and return it. 
+建立一個函式 `extractCurrencyValue(str)` 它將從這樣一個字串中，提取此數字的值，並回傳它。
 
-The example:
+一個例子：
 
 ```js
 alert( extractCurrencyValue('$120') === 120 ); // true