Adding scaffolding, tests and solution

exercism · Feb 9, 2024 · 9d431b5 · 9d431b5
1 parent 45ea797
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diff --git a/config.json b/config.json
@@ -2582,9 +2582,14 @@
         "slug": "ledger",
         "name": "Ledger",
         "uuid": "8716b347-e18f-48a6-b373-426cc4ca98cb",
-        "practices": [],
-        "prerequisites": [],
-        "difficulty": 1
+        "practices": [
+          "strings",
+          "string-formatting"
+        ],
+        "prerequisites": [
+          "string-formatting"
+        ],
+        "difficulty": 4
       }
     ]
   },

diff --git a/exercises/practice/ledger/.meta/proof.ci.js b/exercises/practice/ledger/.meta/proof.ci.js
@@ -0,0 +1,67 @@
+class LedgerEntry {
+  constructor(date, description, change) {
+    this.date = new Date(date);
+    this.description = description;
+    this.change = change;
+  }
+}
+
+const headerRow = (locale) =>
+  locale === 'en-US'
+    ? `${`Date`.padEnd(10, ` `)} | ${`Description`.padEnd(
+        25,
+        ` `,
+      )} | ${`Change`.padEnd(13, ` `)}`
+    : `${`Datum`.padEnd(10, ` `)} | ${`Omschrijving`.padEnd(
+        25,
+        ` `,
+      )} | ${`Verandering`.padEnd(13, ` `)}`;
+
+export const createEntry = (date, description, change) =>
+  new LedgerEntry(date, description, change);
+
+export function formatEntries(currency, locale, entries) {
+  // Generate Header Row
+  let table = headerRow(locale);
+  // Set Formatting Options
+  let formattingOptions = {
+    style: 'currency',
+    currency: currency,
+    currencySign: locale === 'en-US' ? 'accounting' : 'standard',
+    currencyDisplay: locale === 'en-US' ? 'symbol' : 'narrowSymbol',
+    minimumFractionDigits: 2,
+    maximumFractionDigits: 2,
+  };
+  // Sort Entries
+  entries.sort(
+    (a, b) =>
+      a.date - b.date ||
+      a.change - b.change ||
+      a.description.localeCompare(b.description),
+  );
+  // Writing each entry to table
+  entries.forEach((entry) => {
+    table += '\n';
+    // Write entry date to table
+    table += `${entry.date.toLocaleDateString(locale, {
+      day: '2-digit',
+      month: '2-digit',
+      year: 'numeric',
+    })} | `;
+    // Write entry description to table
+    let truncatedDescription =
+      entry.description.length > 25
+        ? `${entry.description.substring(0, 22)}...`
+        : entry.description.padEnd(25, ' ');
+    table += `${truncatedDescription} | `;
+    // Write entry change to table
+    let changeStr = (entry.change / 100).toLocaleString(
+      locale,
+      formattingOptions,
+    );
+    let trailingSpace = changeStr.includes(')') ? '' : ' ';
+    table += `${changeStr}${trailingSpace}`.padStart(13, ' ');
+  });
+
+  return table;
+}
diff --git a/exercises/practice/ledger/ledger.js b/exercises/practice/ledger/ledger.js
@@ -0,0 +1,163 @@
+class LedgerEntry {
+  constructor() {
+    this.date = undefined;
+    this.description = undefined;
+    this.change = undefined;
+  }
+}
+
+export function createEntry(date, description, change) {
+  let entry = new LedgerEntry();
+  entry.date = new Date(date);
+  entry.description = description;
+  entry.change = change;
+  return entry;
+}
+
+export function formatEntries(currency, locale, entries) {
+  let table = '';
+  if (locale === 'en-US') {
+    // Generate Header Row
+    table +=
+      'Date'.padEnd(10, ' ') +
+      ' | ' +
+      'Description'.padEnd(25, ' ') +
+      ' | ' +
+      'Change'.padEnd(13, ' ') +
+      '\n';
+
+    // Sort entries
+    entries.sort(
+      (a, b) =>
+        a.date - b.date ||
+        a.change - b.change ||
+        a.description.localeCompare(b.description),
+    );
+
+    entries.forEach((entry) => {
+      // Write entry date to table
+      const dateStr = `${(entry.date.getMonth() + 1)
+        .toString()
+        .padStart(2, '0')}/${entry.date
+        .getDate()
+        .toString()
+        .padStart(2, '0')}/${entry.date.getFullYear()}`;
+      table += `${dateStr} | `;
+
+      // Write entry description to table
+      const truncatedDescription =
+        entry.description.length > 25
+          ? `${entry.description.substring(0, 22)}...`
+          : entry.description.padEnd(25, ' ');
+      table += `${truncatedDescription} | `;
+
+      // Write entry change to table
+      let changeStr = '';
+      if (currency === 'USD') {
+        let formatingOptions = {
+          style: 'currency',
+          currency: 'USD',
+          //currencySign: 'accounting',
+          minimumFractionDigits: 2,
+          maximumFractionDigits: 2,
+        };
+        if (entry.change < 0) {
+          changeStr = `(${Math.abs(entry.change / 100).toLocaleString(
+            'en-US',
+            formatingOptions,
+          )})`;
+        } else {
+          changeStr = `${(entry.change / 100).toLocaleString(
+            'en-US',
+            formatingOptions,
+          )} `;
+        }
+      } else if (currency === 'EUR') {
+        let formatingOptions = {
+          style: 'currency',
+          currency: 'EUR',
+          minimumFractionDigits: 2,
+          maximumFractionDigits: 2,
+        };
+        if (entry.change < 0) {
+          changeStr = `(${Math.abs(entry.change / 100).toLocaleString(
+            'en-US',
+            formatingOptions,
+          )})`;
+        } else {
+          changeStr = `${(entry.change / 100).toLocaleString(
+            'en-US',
+            formatingOptions,
+          )} `;
+        }
+      }
+      table += changeStr.padStart(13, ' ');
+      table += '\n';
+    });
+  } else if (locale === 'nl-NL') {
+    // Generate Header Row
+    table +=
+      'Datum'.padEnd(10, ' ') +
+      ' | ' +
+      'Omschrijving'.padEnd(25, ' ') +
+      ' | ' +
+      'Verandering'.padEnd(13, ' ') +
+      '\n';
+
+    // Sort entries
+    entries.sort(
+      (a, b) =>
+        a.date - b.date ||
+        a.change - b.change ||
+        a.description.localeCompare(b.description),
+    );
+
+    entries.forEach((entry) => {
+      // Write entry date to table
+      const dateStr = `${entry.date.getDate().toString().padStart(2, '0')}-${(
+        entry.date.getMonth() + 1
+      )
+        .toString()
+        .padStart(2, '0')}-${entry.date.getFullYear()}`;
+      table += `${dateStr} | `;
+
+      // Write entry description to table
+      const truncatedDescription =
+        entry.description.length > 25
+          ? `${entry.description.substring(0, 22)}...`
+          : entry.description.padEnd(25, ' ');
+      table += `${truncatedDescription} | `;
+
+      // Write entry change to table
+      let changeStr = '';
+      if (currency === 'USD') {
+        let formatingOptions = {
+          style: 'currency',
+          currency: 'USD',
+          currencyDisplay: 'narrowSymbol',
+          minimumFractionDigits: 2,
+          maximumFractionDigits: 2,
+        };
+        changeStr = `${(entry.change / 100).toLocaleString(
+          'nl-NL',
+          formatingOptions,
+        )} `;
+      } else if (currency === 'EUR') {
+        let formatingOptions = {
+          style: 'currency',
+          currency: 'EUR',
+          currencyDisplay: 'narrowSymbol',
+          minimumFractionDigits: 2,
+          maximumFractionDigits: 2,
+        };
+        changeStr = `${(entry.change / 100).toLocaleString(
+          'nl-NL',
+          formatingOptions,
+        )} `;
+      }
+      table += changeStr.padStart(13, ' ');
+      table += '\n';
+    });
+  }
+  return table.replace(/\n$/, '');
+}
diff --git a/exercises/practice/ledger/ledger.spec.js b/exercises/practice/ledger/ledger.spec.js
@@ -0,0 +1,139 @@
+import { createEntry, formatEntries } from './ledger';
+
+describe('Ledger', () => {
+  test('empty ledger', () => {
+    let currency = 'USD';
+    let locale = 'en-US';
+    let entries = [];
+    let expected = [
+      'Date       | Description               | Change       ',
+    ].join('\n');
+    expect(formatEntries(currency, locale, entries)).toEqual(expected);
+  });
+
+  xtest('one entry', () => {
+    let currency = 'USD';
+    let locale = 'en-US';
+    let entries = [createEntry('2015-01-01', 'Buy present', -1000)];
+    let expected = [
+      'Date       | Description               | Change       ',
+      '01/01/2015 | Buy present               |      ($10.00)',
+    ].join('\n');
+    expect(formatEntries(currency, locale, entries)).toEqual(expected);
+  });
+
+  xtest('credit and debit', () => {
+    let currency = 'USD';
+    let locale = 'en-US';
+    let entries = [
+      createEntry('2015-01-02', 'Get present', 1000),
+      createEntry('2015-01-01', 'Buy present', -1000),
+    ];
+    let expected = [
+      'Date       | Description               | Change       ',
+      '01/01/2015 | Buy present               |      ($10.00)',
+      '01/02/2015 | Get present               |       $10.00 ',
+    ].join('\n');
+    expect(formatEntries(currency, locale, entries)).toEqual(expected);
+  });
+
+  xtest('final order tie breaker is change', () => {
+    let currency = 'USD';
+    let locale = 'en-US';
+    let entries = [
+      createEntry('2015-01-01', 'Something', 0),
+      createEntry('2015-01-01', 'Something', -1),
+      createEntry('2015-01-01', 'Something', 1),
+    ];
+    let expected = [
+      'Date       | Description               | Change       ',
+      '01/01/2015 | Something                 |       ($0.01)',
+      '01/01/2015 | Something                 |        $0.00 ',
+      '01/01/2015 | Something                 |        $0.01 ',
+    ].join('\n');
+    expect(formatEntries(currency, locale, entries)).toEqual(expected);
+  });
+
+  xtest('overlong description is truncated', () => {
+    let currency = 'USD';
+    let locale = 'en-US';
+    let entries = [
+      createEntry('2015-01-01', 'Freude schoner Gotterfunken', -123456),
+    ];
+    let expected = [
+      'Date       | Description               | Change       ',
+      '01/01/2015 | Freude schoner Gotterf... |   ($1,234.56)',
+    ].join('\n');
+    expect(formatEntries(currency, locale, entries)).toEqual(expected);
+  });
+
+  xtest('euros', () => {
+    let currency = 'EUR';
+    let locale = 'en-US';
+    let entries = [createEntry('2015-01-01', 'Buy present', -1000)];
+    let expected = [
+      'Date       | Description               | Change       ',
+      '01/01/2015 | Buy present               |      (€10.00)',
+    ].join('\n');
+    expect(formatEntries(currency, locale, entries)).toEqual(expected);
+  });
+
+  xtest('Dutch locale', () => {
+    let currency = 'USD';
+    let locale = 'nl-NL';
+    let entries = [createEntry('2015-03-12', 'Buy present', 123456)];
+    let expected = [
+      'Datum      | Omschrijving              | Verandering  ',
+      '12-03-2015 | Buy present               |   $ 1.234,56 ',
+    ].join('\n');
+    expect(formatEntries(currency, locale, entries)).toEqual(expected);
+  });
+
+  xtest('Dutch locale and euros', () => {
+    let currency = 'EUR';
+    let locale = 'nl-NL';
+    let entries = [createEntry('2015-03-12', 'Buy present', 123456)];
+    let expected = [
+      'Datum      | Omschrijving              | Verandering  ',
+      '12-03-2015 | Buy present               |   € 1.234,56 ',
+    ].join('\n');
+    expect(formatEntries(currency, locale, entries)).toEqual(expected);
+  });
+
+  xtest('Dutch negative number with 3 digits before decimal point', () => {
+    let currency = 'USD';
+    let locale = 'nl-NL';
+    let entries = [createEntry('2015-03-12', 'Buy present', -12345)];
+    let expected = [
+      'Datum      | Omschrijving              | Verandering  ',
+      '12-03-2015 | Buy present               |    $ -123,45 ',
+    ].join('\n');
+    expect(formatEntries(currency, locale, entries)).toEqual(expected);
+  });
+
+  xtest('American negative number with 3 digits before decimal point', () => {
+    let currency = 'USD';
+    let locale = 'en-US';
+    let entries = [createEntry('2015-03-12', 'Buy present', -12345)];
+    let expected = [
+      'Date       | Description               | Change       ',
+      '03/12/2015 | Buy present               |     ($123.45)',
+    ].join('\n');
+    expect(formatEntries(currency, locale, entries)).toEqual(expected);
+  });
+
+  xtest('multiple entries on same date ordered by description', () => {
+    let currency = 'USD';
+    let locale = 'en-US';
+    let entries = [
+      createEntry('2015-01-01', 'Get present', 1000),
+      createEntry('2015-01-01', 'Buy present', -1000),
+    ];
+    let expected = [
+      'Date       | Description               | Change       ',
+      '01/01/2015 | Buy present               |      ($10.00)',
+      '01/01/2015 | Get present               |       $10.00 ',
+    ].join('\n');
+    expect(formatEntries(currency, locale, entries)).toEqual(expected);
+  });
+});