學習程式設計1_10_收集、切換、重複

Suggest_Code_01

moveForward()

collectGem()

moveForward()

toggleSwitch()

moveForward()

turnLeft()

moveForward()

collectGem()

moveForward()

toggleSwitch()

moveForward()

moveForward()

turnLeft()

moveForward()

collectGem()

moveForward()

toggleSwitch()

moveForward()

turnLeft()

moveForward()

collectGem()

moveForward()

toggleSwitch()

Result: OK

上述步驟是一步一步走完的程式碼，相當冗長，透過設定函數可以節省版面和編輯時間。觀察下來，可以發現其中4個步驟可以湊成一個循環，這個重複的步驟就可以設定成一個函數。

Suggest_Code_02

func mFcGmFtS(){

    moveForward()

    collectGem()

    moveForward()

    toggleSwitch()

}

mFcGmFtS()

moveForward()

turnLeft()

mFcGmFtS()

moveForward()

moveForward()

turnLeft()

mFcGmFtS()

moveForward()

turnLeft()

mFcGmFtS()

Result: OK

我將 moveForward()、collectGem()、moveForward()、toggleSwitch() 這4個指令組合成一個函數，並命名成 func mFcGmFtS(){...}，在最初逐步執行的程式碼中，將重複的部分以 func mFcGmFtS() 取代，可發現明顯節省了程式碼一些篇幅。

學習程式設計1_09_建立新的函數

Suggest_Code_01

func turnRight(){

turnLeft()

turnLeft()

turnLeft()

}

moveForward()

turnLeft()

moveForward()

turnRight()

moveForward()

turnRight()

moveForward()

turnRight()

moveForward()

turnLeft()

moveForward()

toggleSwitch()

Result: OK

Suggest_Code_02

Func turnRight(){

turnLeft()

turnLeft()

turnLeft()

}

moveForward()

turnRight()

moveForward()

turnRight()

moveForward()

moveForward()

turnRight()

moveForward()

moveForward()

moveForward()

moveForward()

turnRight()

moveForward()

toggleSwitch()

Result: OK

Hint:

關卡內有3塊開關，只要將沒有發亮的開關打開即可，本來就亮著的開關不用再去做 toggleSwitch 的動作。

學習程式設計1_08_組合新的動作

Suggest_Code_01

func turnRight(){

    turnLeft()

    turnLeft()

    turnLeft()

}

moveForward()

moveForward()

moveForward()

turnRight()

moveForward()

moveForward()

moveForward()

collectGem()

Result: OK

學習程式設計1_函數

將現有的一些指令做組合並命名，使它成為一個新的動作（通常是連續一貫的指令），以方便呼叫並且執行。

func_Name(){

A()

B()

C()

}

在上面範例裡的大括弧內部加入一些指令，來定義此函數的行為。

Example:

func_右轉(){

左轉()

左轉()

左轉()

}

簡單來說，在一開始將右轉這個函數透過3次左轉來定義，之後就可以直接呼叫右轉，而不用在程式還要輸入3次左轉。

學習程式設計1_07_最短路線

Suggest_Code_01

moveForward()

moveForward()

moveForward()

collectGem()

turnLeft()

moveForward()

moveForward()

moveForward()

moveForward()

moveForward()

turnLeft()

moveForward()

moveForward()

toggleSwitch()

Result: It takes 10 steps.

Suggest_Code_02

moveForward()

moveForward()

moveForward()

collectGem()

moveForward()

moveForward()

moveForward()

moveForward()

toggleSwitch()

Result: It takes 7 steps, it is the shortest path.

Suggest_Code_03

turnLeft()

moveForward()

moveForward()

turnLeft()

moveForward()

moveForward()

moveForward()

moveForward()

moveForward()

toggleSwitch()

moveForward()

moveForward()

moveForward()

moveForward()

collectGem()

Result: It takes 11 steps.

學習程式設計1_06_除錯練習

Original code as follow:

moveForward()

moveForward()

moveForward()

turnLeft()

toggleSwitch()

moveForward()

moveForward()

moveForward()

collectGem()

moveForward()

Suggest code 01:

moveForward()

turnLeft()

moveForward()

moveForward()

toggleSwitch()

moveForward()

moveForward()

moveForward()

moveForward()

collectGem()

Result: OK

學習程式設計1_05_尋找並修正錯誤

Original code as follow:

moveForward()

turnLeft()

moveForward()

moveForward()

collectGem()

moveForward()

toggleSwitch()

Suggest code 01:

moveForward()

moveForward()

turnLeft()

moveForward()

collectGem()

moveForward()

toggleSwitch()

Result: OK

學習程式設計1_04_傳送門練習

Suggest code 01

moveForward()

moveForward()

moveForward()

turnLeft()

moveForward()

moveForward()

toggleSwitch()

moveForward()

moveForward()

turnLeft()

moveForward()

moveForward()

collectGem()

Result: OK

學習程式設計1_03_切換開關

Suggest_Code_01

moveForward()

moveForward()

turnLeft()

moveForward()

collectGem()

moveForward()

turnLeft()

moveForward()

moveForward()

toggleSwitch()

Result: OK

Hint: 在這一關卡裡，除了收集寶石以外，開關也要切換成發亮的狀態才算完成。

學習程式設計1_02_加入新指令

Suggest_Code_01

moveForward()

moveForward()

turnLeft()

moveForward()

moveForward()

collectGem()

Result: OK

學習程式設計1_01_發出指令

Suggest_Code_01

moveForward()

moveForward()

moveForward()

collectGem()

Result: OK