add resistor-color exercise (#21)

* add resistor-color exercise

* use NEW

config.json

@@ -45,6 +45,14 @@
         "prerequisites": [],
         "difficulty": 1
       },
+      {
+        "slug": "resistor-color",
+        "name": "Resistor Color",
+        "uuid": "978db3d3-0a13-4ca1-b75b-051e389bf171",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 1
+      },
       {
         "slug": "leap",
         "name": "Leap",

exercises/practice/resistor-color/.docs/instructions.md

@@ -0,0 +1,36 @@
+# Description
+
+If you want to build something using a Raspberry Pi, you'll probably use _resistors_.
+For this exercise, you need to know two things about them:
+
+- Each resistor has a resistance value.
+- Resistors are small - so small in fact that if you printed the resistance value on them, it would be hard to read.
+
+To get around this problem, manufacturers print color-coded bands onto the resistors to denote their resistance values.
+Each band has a position and a numeric value.
+
+The first 2 bands of a resistor have a simple encoding scheme: each color maps to a single number.
+
+In this exercise you are going to create a helpful program so that you don't have to remember the values of the bands.
+
+These colors are encoded as follows:
+
+- Black: 0
+- Brown: 1
+- Red: 2
+- Orange: 3
+- Yellow: 4
+- Green: 5
+- Blue: 6
+- Violet: 7
+- Grey: 8
+- White: 9
+
+The goal of this exercise is to create a way:
+
+- to look up the numerical value associated with a particular color band
+- to list the different band colors
+
+Mnemonics map the colors to the numbers, that, when stored as an array, happen to map to their index in the array: Better Be Right Or Your Great Big Values Go Wrong.
+
+More information on the color encoding of resistors can be found in the [Electronic color code Wikipedia article](https://en.wikipedia.org/wiki/Electronic_color_code)

exercises/practice/resistor-color/.meta/config.json

@@ -0,0 +1,12 @@
+{
+  "blurb": "Resistor Color",
+  "authors": ["larshp"],
+  "contributors": [],
+  "files": {
+    "solution": ["zcl_resistor_color.clas.abap"],
+    "test": ["zcl_resistor_color.clas.testclasses.abap"],
+    "example": [".meta/zcl_resistor_color.clas.abap"]
+  },
+  "source": "Maud de Vries, Erik Schierboom",
+  "source_url": "https://github.com/exercism/problem-specifications/issues/1458"
+}

exercises/practice/resistor-color/.meta/zcl_resistor_color.clas.abap

@@ -0,0 +1,37 @@
+CLASS zcl_resistor_color DEFINITION PUBLIC CREATE PUBLIC.
+  PUBLIC SECTION.
+    METHODS resistor_color
+      IMPORTING
+        color_code   TYPE string
+      RETURNING
+        VALUE(value) TYPE i.
+ENDCLASS.
+
+CLASS zcl_resistor_color IMPLEMENTATION.
+
+  METHOD resistor_color.
+
+    CASE color_code.
+      WHEN 'brown'.
+        value = 1.
+      WHEN 'red'.
+        value = 2.
+      WHEN 'orange'.
+        value = 3.
+      WHEN 'yellow'.
+        value = 4.
+      WHEN 'green'.
+        value = 5.
+      WHEN 'blue'.
+        value = 6.
+      WHEN 'violet'.
+        value = 7.
+      WHEN 'grey'.
+        value = 8.
+      WHEN 'white'.
+        value = 9.
+    ENDCASE.
+
+  ENDMETHOD.
+
+ENDCLASS.

exercises/practice/resistor-color/zcl_resistor_color.clas.abap

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+CLASS zcl_resistor_color DEFINITION PUBLIC CREATE PUBLIC.
+  PUBLIC SECTION.
+    METHODS resistor_color
+      IMPORTING
+        color_code   TYPE string
+      RETURNING
+        VALUE(value) TYPE i.
+ENDCLASS.
+
+CLASS zcl_resistor_color IMPLEMENTATION.
+
+  METHOD resistor_color.
+* add solution here
+  ENDMETHOD.
+
+ENDCLASS.

exercises/practice/resistor-color/zcl_resistor_color.clas.testclasses.abap

@@ -0,0 +1,39 @@
+CLASS ltcl_test DEFINITION FOR TESTING
+  DURATION SHORT
+  RISK LEVEL HARMLESS FINAL.
+
+  PRIVATE SECTION.
+    DATA cut TYPE REF TO zcl_resistor_color.
+    METHODS setup.
+    METHODS test_black FOR TESTING.
+    METHODS test_white FOR TESTING.
+    METHODS test_orange FOR TESTING.
+
+ENDCLASS.
+
+
+CLASS ltcl_test IMPLEMENTATION.
+
+  METHOD setup.
+    cut = NEW #( ).
+  ENDMETHOD.
+
+  METHOD test_black.
+    cl_abap_unit_assert=>assert_equals(
+      act = cut->resistor_color( 'black' )
+      exp = 0 ).
+  ENDMETHOD.
+
+  METHOD test_white.
+    cl_abap_unit_assert=>assert_equals(
+      act = cut->resistor_color( 'white' )
+      exp = 9 ).
+  ENDMETHOD.
+
+  METHOD test_orange.
+    cl_abap_unit_assert=>assert_equals(
+      act = cut->resistor_color( 'orange' )
+      exp = 3 ).
+  ENDMETHOD.
+
+ENDCLASS.