BacnkOCR pure ES6 version.

.github/workflows/javascript.yml

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+name: Test JavaScript Jest
+
+on:
+  push:
+    paths:
+      - 'javascript/**'
+      - '.github/workflows/javascript.yml'
+  pull_request:
+    paths:
+      - 'javascript/**'
+      - '.github/workflows/javascript.yml'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Check out the repo
+      uses: actions/checkout@v2
+
+    - name: Set up Node.js
+      uses: actions/setup-node@v1
+      with:
+        node-version: 15.x
+
+    - name: Set up dependencies
+      working-directory: javascript
+      run: npm install
+
+    - name: Test
+      working-directory: javascript
+      run: npm test

javascript/.gitignore

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+.DS_Store
+.idea
+
+# Node
+node_modules/
+npm-debug.log
+package-lock.json
+
+dist/
+coverage/
+.nyc_output/

javascript/jest.config.js

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+/** @type {import ('@jest/types').Config.InitialOptions} */
+module.exports = {
+
+}

javascript/package.json

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+{
+    "name": "bank-ocr-refactoring-kata",
+    "version": "0.0.1",
+    "scripts": {
+        "test": "jest",
+        "test:coverage": "jest --coverage"
+    },
+    "devDependencies": {
+        "@types/jest": "^27.0.0",
+        "jest": "^27.0.0"
+    }
+}

javascript/src/ocr.js

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+const NUMERALS = [
+    [' _  ',
+     '| | ',
+     '|_| ',
+     '    '],
+    ['    ',
+     '  | ',
+     '  | ',
+     '    '],
+    [' _  ',
+     ' _| ',
+     '|_  ',
+     '    '],
+    [' _  ',
+     ' _| ',
+     ' _| ',
+     '    '],
+    ['    ',
+     '|_| ',
+     '  | ',
+     '    '],
+    [' _  ',
+     '|_  ',
+     ' _| ',
+     '    '],
+    [' _  ',
+     '|_  ',
+     '|_| ',
+     '    '],
+    [' _  ',
+     '  | ',
+     '  | ',
+     '    '],
+    [' _  ',
+     '|_| ',
+     '|_| ',
+     '    '],
+    [' _  ',
+     '|_| ',
+     ' _| ',
+     '    ']];
+
+class Ocr {
+
+    /**
+     * @param {string[]} lines 
+     * @returns {string[]}
+     */
+    static parse(lines) {
+        /** @type {string[]} */
+        const result = [];
+        for (let i = 0; i < lines.length; i += 4) {
+            let work = [' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' '];
+            for (let pos = 0; pos < 9; ++pos) {
+                work[pos] = '?';
+                let got1 = false;
+                for (let numeral = 0; numeral <= 9; ++numeral) {
+                    let ok = true;
+                    for (let row = 0; row < 4; ++row) {
+                        for (let col = 0; col < 4; ++col) {
+                            if (NUMERALS[numeral][row][col] !== lines[i + row][4 * pos + col])
+                                ok = false;
+                        }
+                    }
+                    if (ok) {
+                        work[pos] = String.fromCharCode(numeral + '0'.charCodeAt(0));
+                        got1 = true;
+                        break;
+                    }
+                }
+                if (!got1) {
+                    work[10] = 'I';
+                    work[11] = work[12] = 'L';
+                }
+            }
+            result.push(work.join(''));
+        }
+        return result;
+    }
+}
+
+module.exports = {
+    Ocr
+};

javascript/tests/ocr.spec.js

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+const { Ocr } = require('../src/ocr');
+
+describe('Ocr', () => {
+
+    it('parses_one_record_with_888888888', () => {
+        expect(Ocr.parse([' _   _   _   _   _   _   _   _   _  ',
+                          '|_| |_| |_| |_| |_| |_| |_| |_| |_| ',
+                          '|_| |_| |_| |_| |_| |_| |_| |_| |_| ',
+                          '                                    '])).
+            toEqual(['888888888    ']);
+    });
+
+    it('parses_two_records_with_888888888', () => {
+        expect(Ocr.parse([' _   _   _   _   _   _   _   _   _  ',
+                          '|_| |_| |_| |_| |_| |_| |_| |_| |_| ',
+                          '|_| |_| |_| |_| |_| |_| |_| |_| |_| ',
+                          '                                    ',
+                          ' _   _   _   _   _   _   _   _   _  ',
+                          '|_| |_| |_| |_| |_| |_| |_| |_| |_| ',
+                          '|_| |_| |_| |_| |_| |_| |_| |_| |_| ',
+                          '                                    '])).
+            toEqual(['888888888    ',
+                     '888888888    ']);
+    });
+
+    it('parses_one_record_with_123456790', () => {
+        expect(Ocr.parse(['     _   _       _   _   _   _   _  ',
+                          '  |  _|  _| |_| |_  |_    | |_| | | ',
+                          '  | |_   _|   |  _| |_|   |  _| |_| ',
+                          '                                    '])).
+            toEqual(['123456790    ']);
+    });
+
+    it('parses_two_records', () => {
+        expect(Ocr.parse(['     _   _       _   _   _   _   _  ',
+                          '  |  _|  _| |_| |_  |_    | |_| | | ',
+                          '  | |_   _|   |  _| |_|   |  _| |_| ',
+                          '                                    ',
+                          ' _       _   _   _       _   _   _  ',
+                          '|_| |_|   | |_|   | |_|  _|  _|  _| ',
+                          ' _|   |   | |_|   |   | |_  |_  |_  ',
+                          '                                    '])).
+            toEqual(['123456790    ',
+                     '947874222    ']);
+    });
+
+    it('parses_illegal_digit', () => {
+        expect(Ocr.parse(['     _   _       _   _   _   _   _  ',
+                          '  |  _| |_|  _| |_  |_    | |_| | | ',
+                          '  | |_   _    |  _| |_|   |  _| |_| ',
+                          '                                    '])).
+            toEqual(['12??56790 ILL']);
+    });
+
+    // it('checksum_fail_returns_ERR', () => {
+    //     expect(Ocr.parse([' _   _       _   _           _   _  ',
+    //                       '|_  |_  |_|  _|   |   | |_| |_| |_  ',
+    //                       '|_| |_|   |  _|   |   |   |  _|  _| ',
+    //                       '                                    '])).
+    //         toEqual(['664371495 ERR']);
+    // });
+
+});