Merge pull request #10 from andresautentia/christmas-solution

feat: add new christmas-tree solution

src/christmas-tree/solutions/short.christmas-tree.spec.ts

@@ -0,0 +1,13 @@
+import { christmasTree } from './short.christmas-tree'
+
+describe('christmas-tree', function () {
+  it('should print a christmas tree with 3 rows', function () {
+    const tree: string = christmasTree(3)
+    expect(tree).toBe('  *\n' + ' ***\n' + '*****\n' + '  |')
+  })
+
+  it('should print a christmas tree with 5 rows', function () {
+    const tree: string = christmasTree(5)
+    expect(tree).toBe('    *\n' + '   ***\n' + '  *****\n' + ' *******\n' + '*********\n' + '    |')
+  })
+})

src/christmas-tree/solutions/short.christmas-tree.ts

@@ -0,0 +1,25 @@
+export const christmasTree = (rows: number): string => {
+  let tree: string = ''
+  let numberSpaces: number = rows - 1
+  tree = generateRow(rows, tree, numberSpaces)
+  tree = generateTrunk(rows, tree)
+  return tree
+}
+
+const generateTrunk = (rows: number, tree: string): string => {
+  for (let i: number = 0; i < rows; i++) {
+    tree += i === rows - 1 ? '|' : ' '
+  }
+  return tree
+}
+
+const generateRow = (rows: number, tree: string, numberSpaces: number): string => {
+  for (let i: number = 0; i < rows; i++) {
+    for (let o: number = 0; o < rows + i; o++) {
+      tree += o < numberSpaces ? ' ' : '*'
+    }
+    numberSpaces--
+    tree += '\n'
+  }
+  return tree
+}