finish home task

.babelrc

@@ -0,0 +1,3 @@
+{
+  "presets": ["env"]
+}

.travis.yml

@@ -0,0 +1,3 @@
+language: node_js
+node_js:
+  - "lts/*"

package.json

@@ -23,6 +23,10 @@
   },
   "homepage": "https://github.com/front-camp-2018/project-scaffoldings#readme",
   "devDependencies": {
+    "babel-cli": "^6.26.0",
+    "babel-core": "^6.26.3",
+    "babel-jest": "^23.6.0",
+    "babel-preset-env": "^1.7.0",
     "css-loader": "^1.0.0",
     "eslint": "^5.6.1",
     "eslint-plugin-jest": "^21.25.1",

src/dragon-curve/index.js

@@ -1,3 +1,50 @@
 export const dragonCurve = n => {
-  // logic...
+  let size = Math.pow(2, n);
+  let arr = [];
+  arr.length = --size;
+  arr = getDirections(n);
+  const result = Number(arr.join(''));
+
+  return result;
 };
+
+const getDirections = number => {
+  let size = Math.pow(2, number);
+  const arr = [];
+  arr.length = --size;
+
+  if (number === 1) {
+    arr[0] = 1;
+    return arr;
+  } else {
+    let sizeOther = Math.pow(2, number - 1);
+    let arrOther = [];
+    arrOther.length = --sizeOther;
+    arrOther = getDirections(number - 1);
+
+    for (let i = 0; i < sizeOther; i++) {
+      arr[i] = arrOther[i];
+    }
+
+    arr[sizeOther] = 1;
+
+    for (let i = 0; i < sizeOther; i++) {
+      if (arrOther[i] === 1) {
+        arrOther[i] = 0;
+      } else {
+        arrOther[i] = 1;
+      }
+    }
+
+    let index = 0;
+
+    for (let i = size - 1; i > size / 2; i--) {
+      arr[i] = arrOther[index];
+      index++;
+    }
+
+    return arr;
+  }
+
+};
+

src/dragon-curve/index.spec.js

@@ -1,5 +1,10 @@
-import {dragonCurve} from './index'
+import {dragonCurve} from './index';
 
 describe('dragonCurve::', () => {
-  // need to implement
+  it('Should return number as is', () => {
+    expect(dragonCurve(1)).toEqual(1);
+    expect(dragonCurve(2)).toEqual(110);
+    expect(dragonCurve(3)).toEqual(1101100);
+    expect(dragonCurve(4)).toEqual(110110011100100);
+  });
 });

src/rotate-matrix/index.js

@@ -1,4 +1,20 @@
 export const rotateMatrix = arr => {
-  // logic...
+  const width = arr.length || 0;
+  const height = arr[0] instanceof Array ? arr[0].length : 0;
+
+  if (height === 0 || width === 0) {
+    return [];
+  }
+
+  const transformation = [];
+
+  for (let i = 0; i < height; i++) {
+    transformation[i] = [];
+    for (let j = 0; j < width; j++) {
+      transformation[i][j] = arr[j][i];
+    }
+  }
+
+  return transformation;
 };
 

src/rotate-matrix/index.spec.js

@@ -1,5 +1,24 @@
-import {rotateMatrix} from './index'
+import {rotateMatrix} from './index';
 
 describe('rotateMatrix::', () => {
-  // need to implement
+  const arr1 = [
+    [1, 2],
+    [3, 4]
+  ];
+  const arr2 = [
+    [1, 2, 3],
+    [4, 5, 6],
+    [7, 8, 9]
+  ];
+  it('Should return', () => {
+    expect(rotateMatrix(arr1)).toEqual([
+      [1,3],
+      [2,4]
+    ]);
+    expect(rotateMatrix(arr2)).toEqual([
+      [1,4,7],
+      [2,5,8],
+      [3,6,9]
+    ]);
+  });
 });