Add first assignment

thesecretlab · Jul 19, 2016 · 1166e0d · 1166e0d
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diff --git a/Assignment-1.md b/Assignment-1.md
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+# Assignment 1
+
+In this assignment, you'll make a command-line app that does the following things:
+
+* Read a CSV file, which contains strings and numbers
+* Divide the data into two groups
+* Print a report based on these two groups to the console
+
+## Details:
+
+Given a text file containing this data:
+
+    Shipment Type,Weight (t)
+    Neptune Fuel,6
+    Neptune Fuel,5
+    Neptune Fuel,6
+    Neptune Fuel,4
+    Mars Food,3
+    Neptune Fuel,10
+    Mars Food,3
+    Neptune Fuel,6
+    Mars Food,10
+    Neptune Fuel,8
+    Mars Food,7
+    Mars Food,2
+    Mars Food,9
+    Neptune Fuel,5
+    Neptune Fuel,7
+    Mars Food,8
+    Mars Food,7
+    Mars Food,9
+
+The program should produce the following output:
+
+    Mars Food: 58
+    Neptune Fuel: 57
+
+### Notes
+
+* The first line of the data simply describes the content - it doesn't contain data to use.
+* The application should error if it encounters any data besides "Mars Food" and "Neptune Fuel".
+* The numbers in the data are always integers.
+
+## Some tools
+
+Here are some useful tips that can help you to build this program.
+
+### How to add a text file
+
+Open the File menu, and choose New -> New File.
+
+![Choosing File->New->New File](Figures/new-file-1.png)
+
+Scroll down to the OS X section, and choose Empty File.
+
+![Creating a new Empty File](Figures/new-file-2.png)
+
+Name the new file data.csv.
+
+### How to make sure the text file is in the same folder as your built product
+
+Select the Project at the top of the Project navigator.
+
+![Add File 1](Figures/add-file-1.png)
+
+Choose Build Phases at the top of the window.
+
+![Add File 2](Figures/add-file-2.png)
+
+Open the Copy File section, and drag the file into the list.
+
+![Add File 3](Figures/add-file-3.png)
+
+Turn off **Copy only when installing**, and set the **Destination** to *Products Directory*.
+
+![Add File 4](Figures/add-file-4.png)
+
+When you build and run the program, the file will be copied into the same directory as the compiled program.
+
+### How to open a file
+
+Use the `contentsOfFile` initialiser for `String`:
+
+    String(contentsOfFile: "data.csv")
+
+Note that this returns an optional!
+
+### How to split a string
+
+Use the `componentsSeparatedByString` method on a string:
+
+    data.componentsSeparatedByString("\n")
+
+Note that not all text files end their lines with \n! A better option is to use the `NSCharacterSet` class and the `componentsSeparatedByCharactersInSet`:
+
+    let newlineCharacterSet = NSCharacterSet.newlineCharacterSet()
+
+    data.componentsSeparatedByCharactersInSet(newlineCharacterSet)
+
+### How to convert a `String` to an `Int`
+
+Pass the string to the `Int`'s initialiser:
+
+    let theInt = Int("42")
+
+Note that this returns an optional, because the string might not contain an int!
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diff --git a/CommandLine/CommandLine.xcodeproj/project.xcworkspace/contents.xcworkspacedata b/CommandLine/CommandLine.xcodeproj/project.xcworkspace/contents.xcworkspacedata
diff --git a/CommandLine/CommandLine/data.csv b/CommandLine/CommandLine/data.csv
@@ -0,0 +1,19 @@
+Shipment Type,Weight (t)
+Neptune Fuel,6
+Neptune Fuel,5
+Neptune Fuel,6
+Neptune Fuel,4
+Mars Food,3
+Neptune Fuel,10
+Mars Food,3
+Neptune Fuel,6
+Mars Food,10
+Neptune Fuel,8
+Mars Food,7
+Mars Food,2
+Mars Food,9
+Neptune Fuel,5
+Neptune Fuel,7
+Mars Food,8
+Mars Food,7
+Mars Food,9