feat: adds lesson_06 homework and lesson_07 pre-work (code-differently#277)

* chore: adds lesson_06 details and lesson_07 pre-work

Signed-off-by: Anthony D. Mays <[email protected]>

* chore: remove hint

Signed-off-by: Anthony D. Mays <[email protected]>

---------

Signed-off-by: Anthony D. Mays <[email protected]>

Author: anthonydmays

lesson_06/README.md

@@ -8,4 +8,87 @@ Please review the following resources before lecture:
 
 ## Homework
 
-- TODO(anthonydmays): Add details on Monday
+- [ ] Complete the [Expression Calculator](#expression-calculator) exercise.
+- [ ] Read article entitled [3 Questions That Will Make You A Phenomenal Rubber Duck][article-link]
+- [ ] Do pre-work for [lesson 07](/lesson_07/).
+
+### Expression Calculator
+
+For this assignment, you will need to implement the functions and logic required to calculate a mathematical expression. After implementing the `add`, `divide`, and `multiply` functions, you will combine these functions to compute the final result.
+
+1. Update the [.env.test][env-file] file to configure the correct homework version.
+```bash
+# Example config for students assigned to homework "D".
+HW_VERSION=D
+```
+2. Run the program to determine the expression you must implement.
+```bash
+npm install
+npm run compile
+npm start
+```
+1. Update the code in the [expression_calculator.ts][calculator-file] file.
+2. To check your work, you can run the application using the first command below and run the tests using the second one.
+```bash
+npm start
+```
+1. As usual, make sure that you format your code and run the check command before creating your pull request.
+```bash
+npm run check
+```
+1. You must only submit changes to the `expression_calculator.ts` file to receive full credit.
+
+### Stretch Assignment
+
+Implement a function that validates whether a given alphabetic abbreviation matches a word using a special encoding system.
+
+In this system, numbers in abbreviations are replaced by their corresponding alphabet letters:
+- 'a' represents 1, 'b' represents 2, 'c' represents 3, ..., 'z' represents 26
+- The abbreviation follows the same rules as standard abbreviations but uses letters instead of digits
+- Letters cannot have leading zeros (e.g., no 'aa' for 01)
+- Adjacent abbreviated substrings are not allowed
+- Empty substrings cannot be abbreviated
+
+**Function Signature:**
+```typescript
+function isValidAlphaAbbreviation(word: string, abbr: string): boolean
+```
+
+**Examples:**
+
+Example 1:
+```
+Input: word = "internationalization", abbr = "irzdn"
+Output: true
+Explanation: 
+- "internationalization" can be abbreviated as "i m z d n"
+- i + (m=13 chars) + z + (d=4 chars) + n
+- i + nternationaliza + z + atio + n = "internationalization"
+```
+
+Example 2:
+```
+Input: word = "substitution", abbr = "sjn"
+Output: true  
+Explanation:
+- s + (j=10 chars) + n
+- s + ubstitutio + n = "substitution"
+```
+
+**Invalid Examples:**
+```
+Input: word = "test", abbr = "ab"
+Output: false
+Explanation: Adjacent letters 'a' and 'b' would represent adjacent abbreviated substrings
+```
+
+**Constraints:**
+- 1 ≤ word.length ≤ 25
+- 1 ≤ abbr.length ≤ 15
+- word consists of only lowercase English letters
+- abbr consists of only lowercase English letters
+- Letters representing numbers follow a=1, b=2, ..., z=26
+
+[article-link]: https://blog.danslimmon.com/2024/01/18/3-questions-that-will-make-you-a-phenomenal-rubber-duck/
+[calculator-file]: ./expression/src/expression_calculator.ts
+[env-file]: ./expression/.env.test

lesson_06/expression/.editorconfig

@@ -0,0 +1,8 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+insert_final_newline = true

lesson_06/expression/.env.test

@@ -0,0 +1 @@
+HW_VERSION=your assigned version here

lesson_06/expression/.eslintignore

@@ -0,0 +1 @@
+build/

lesson_06/expression/.prettierignore

@@ -0,0 +1,3 @@
+# Ignore artifacts:
+build
+coverage

lesson_06/expression/.prettierrc

@@ -0,0 +1 @@
+{}

lesson_06/expression/eslint.config.js

@@ -0,0 +1,15 @@
+// @ts-check
+
+import eslint from "@eslint/js";
+import tseslint from "typescript-eslint";
+import eslintConfigPrettier from "eslint-config-prettier";
+
+export default tseslint.config(
+  eslint.configs.recommended,
+  ...tseslint.configs.strict,
+  ...tseslint.configs.stylistic,
+  eslintConfigPrettier,
+  {
+    ignores: ["build"],
+  },
+);

lesson_06/expression/jest.config.js

@@ -0,0 +1,11 @@
+/** @type {import('ts-jest').JestConfigWithTsJest} **/
+export default {
+  testEnvironment: "node",
+  transform: {
+    "^.+.tsx?$": ["ts-jest", { useESM: true }],
+  },
+  moduleNameMapper: {
+    "^(\\.\\.?\\/.+)\\.js$": "$1",
+  },
+  extensionsToTreatAsEsm: [".ts"],
+};