Initial introduction with union, intersection and subset

.babelrc

@@ -0,0 +1,5 @@
+{
+  "presets": [
+    "env"
+  ]
+}

.gitignore

@@ -0,0 +1,3 @@
+.vscode/
+node_modules/
+yarn.lock

.travis.yml

@@ -0,0 +1,3 @@
+language: node_js
+node_js:
+  - "8"

README.md

@@ -1 +1,28 @@
 # Maths but with Javascript
+This is a very experimental project, there is no point to this at all, except to have a little fun. If you would like to contribute please open a pull request. 
+
+### Sets
+A set is a collection of distinct objects, considered as an object in its own right. For example, the number 1, 2 and 3 are but together they form an set of size three, written `{1,2,3}`
+
+For the ease of development, a set in this repository is represented using array syntax. The following is how we will represent sets `A = {3, 8, 7, 16, 10, 15}` and `B = {1, 2, 8, 10, 15}`.
+```javascript
+const a = [3, 8, 7, 16, 10, 15];
+const b = [1, 2, 8, 10, 15];
+```
+
+#### Equality
+It is worth noting that the sets `A = {1,2,3}` and `B = {3, 1, 2}` are in fact equal as set theory does not care about order. In javascript however, comparing `[1,2,3]` and `[3, 1, 2]` would be false. Hell, even comparing `[1,2,3]` with `[1,2,3]` would produce false. Javascript `/shrug`
+
+### Union
+The Union of two sets produces a new set which are in a, b or both a and b. 
+
+```javascript
+const a = [3, 8, 7, 16, 10, 15];
+const b = [1, 2, 8, 10, 15];
+
+const c = union(a, b);
+// = [1, 2, 3, 7, 8, 10, 15, 16]
+```
+### Intersection
+
+### Subset

package.json

@@ -0,0 +1,23 @@
+{
+  "name": "maths-but-javascript",
+  "version": "1.0.0",
+  "main": "src/index.js",
+  "repository": "https://github.com/ITSociety/maths-but-javascript",
+  "author": "Samuel Stenton <sthstenton@gmail.com>",
+  "license": "MIT",
+  "scripts": {
+    "test": "jest"
+  },
+  "engines": {
+    "node": ">=8.9.0"
+  },
+  "devDependencies": {
+    "babel-core": "^6.26.3",
+    "babel-jest": "^23.6.0",
+    "jest": "^23.6.0",
+    "regenerator-runtime": "^0.12.1",
+    "babel-preset-env": "^1.7.0"
+  },
+  "dependencies": {
+  }
+}

src/index.js

@@ -0,0 +1 @@
+export { union } from './union';

src/union.js

@@ -0,0 +1 @@
+export const union = (a,b) => Array.from(new Set(a.concat(b)));

test/union.test.js

@@ -0,0 +1,5 @@
+const { union } = require('../src/index');
+
+test('it should union two sets', () => {
+  expect(union([3, 8, 7, 16, 10, 15], [1, 2, 8, 10, 15])).toEqual(expect.arrayContaining([1, 2, 3, 7, 8, 10, 15, 16]));
+});