Day two

.eslintrc

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+{
+  "rules": {
+    "no-console": "off",
+    "indent": [ "error", 2 ],
+    "quotes": [ "error", "single" ],
+    "semi": ["error", "always"],
+    "linebreak-style": [ "error", "unix" ]
+  },
+  "env": {
+    "es6": true,
+    "node": true,
+    "mocha": true,
+    "jasmine": true
+  },
+  "ecmaFeatures": {
+    "modules": true,
+    "experimentalObjectRestSpread": true,
+    "impliedStrict": true
+  },
+  "extends": "eslint:recommended"
+}

.gitignore

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+
+# Created by https://www.gitignore.io/api/osx,vim,node,windows
+
+### Node ###
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Typescript v1 declaration files
+typings/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+
+
+### OSX ###
+*.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+### Vim ###
+# swap
+[._]*.s[a-v][a-z]
+[._]*.sw[a-p]
+[._]s[a-v][a-z]
+[._]sw[a-p]
+# session
+Session.vim
+# temporary
+.netrwhist
+*~
+# auto-generated tag files
+tags
+
+### Windows ###
+# Windows thumbnail cache files
+Thumbs.db
+ehthumbs.db
+ehthumbs_vista.db
+
+# Folder config file
+Desktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Windows Installer files
+*.cab
+*.msi
+*.msm
+*.msp
+
+# Windows shortcuts
+*.lnk
+
+# End of https://www.gitignore.io/api/osx,vim,node,windows
+/lab-eddie/node_modules

lab-eddie/lib/fp.js

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+'use strict';
+
+module.exports = exports = {};
+
+exports.argumentLengthError = (argLength, expectedLength) => {
+  if(argLength < expectedLength) throw new Error(`exports.requires ${expectedLength} arguments. Only ${argLength} provided.`);
+};
+exports.typeError = (objType, expectedType) => {
+  if(objType !== expectedType) throw new Error(`exports.expected ${expectedType} type parameter but recieved ${objType} instead.`);
+};
+
+exports.isArray = (arr) => Array.isArray(arr) ? 'array' : typeof arr;
+
+
+exports.map = function(arr, callback) {
+  let argumentLength = arguments.length;
+  this.argumentLengthError(argumentLength, 2);
+  this.typeError(this.isArray(arr), 'array');
+  this.typeError(typeof callback, 'function');
+  return Array.prototype.map.call(arr, callback);
+};
+
+exports.filter = function(arr, callback) {
+  let argumentLength = arguments.length;
+  this.argumentLengthError(argumentLength, 2);
+  this.typeError(this.isArray(arr), 'array');
+  this.typeError(typeof callback, 'function');
+  return Array.prototype.filter.call(arr, callback);
+};
+
+exports.reduce = function(arr, callback, count) {
+
+  let argumentLength = arguments.length;
+  this.argumentLengthError(argumentLength, 2);
+  if(count === undefined) count = arr[0];
+
+  this.typeError(this.isArray(arr), 'array');
+  this.typeError(typeof callback, 'function');
+  return Array.prototype.reduce.call(arr, callback, count);
+};
+
+exports.concat = function(firstArray, secondArray) {
+  let argumentLength = arguments.length;
+  this.argumentLengthError(argumentLength, 2);
+  this.typeError(this.isArray(firstArray), 'array');
+  this.typeError(this.isArray(secondArray), 'array');
+  return Array.prototype.concat.apply(firstArray, secondArray);
+},
+
+exports.splice = function(arr, startingIndex, amountToDelete, ...items) {
+  let argumentLength = arguments.length;
+  this.argumentLengthError(argumentLength, 2);
+  this.typeError(this.isArray(arr), 'array');
+  this.typeError(typeof startingIndex, 'number');
+  if(amountToDelete) this.typeError(typeof amountToDelete, 'number');
+  return Array.prototype.splice.call(arr, startingIndex, amountToDelete, ...items);
+};

lab-eddie/package.json

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+{
+  "name": "lab-eddie",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "directories": {
+    "test": "mocha"
+  },
+  "scripts": {
+    "test": "mocha",
+    "lint": "eslint"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "devDependencies": {
+    "chai": "^4.1.0",
+    "mocha": "^3.4.2"
+  }
+}

lab-eddie/test/fp-test.js

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+'use strict';
+
+const fp = require('../lib/fp.js');
+const expect = require('chai').expect;
+
+let testingArray = [1, 5, 7, 8];
+let secondTestArray = [9, 1, 1, 4];
+
+describe('Test for fp module', () => {
+
+  describe('#map', () => {
+
+    it('Should return a new modified array', () => {
+      let mappedArray = fp.map(testingArray, (val) => val + 1);
+      let secondMappedArray = fp.map(testingArray, (val) => Math.pow(val, 2));
+      expect(mappedArray).to.deep.equal([2, 6, 8, 9]);
+      expect(secondMappedArray).to.deep.equal([1, 25, 49, 64]);
+    });
+
+    it('Should throw an error when invalid arguements are entered', () => {
+      expect(fp.map.bind(fp)).to.throw(Error);
+      expect(fp.map.bind(fp, [1, 2, 3, 4])).to.throw(Error);
+      expect(fp.map.bind(fp, [1, 2, 3], 'not a callback')).to.throw(Error);
+      expect(fp.map.bind(fp, 'not an array', (val) => 1 + val)).to.throw(Error);
+    });
+
+  });
+
+  describe('#filter', () => {
+
+    it('Should return a new filtered array', () => {
+      let filterArray = fp.filter(testingArray, (val) => val <  6);
+      let secondFilterArray = fp.filter(testingArray, (val) => val > 5);
+      expect(filterArray).to.deep.equal([1, 5]);
+      expect(secondFilterArray).to.deep.equal([7, 8]);
+    });
+
+    it('Should throw an error when invalid arguements are entered', () => {
+      expect(fp.filter.bind(fp)).to.throw(Error);
+      expect(fp.filter.bind(fp, [1, 2, 3, 4])).to.throw(Error);
+      expect(fp.filter.bind(fp, [1, 2, 3], 'not a callback')).to.throw(Error);
+      expect(fp.filter.bind(fp, 'not an array', (val) => 1 + val)).to.throw(Error);
+    });
+  })
+
+  describe('#reduce', () => {
+
+    it('Should return a reduced array', () => {
+      let reduceArray = fp.reduce(testingArray, (count, val) => {
+        count += val;
+        return count;
+      }, 0);
+      let secondReduceArray = fp.reduce(testingArray, (count, val) => {
+        count.push(val + 1);
+        return count;
+      }, [1]);
+      expect(reduceArray).to.equal(21);
+      expect(secondReduceArray).to.deep.equal([1, 2, 6, 8, 9]);
+    });
+
+    it('Should throw an error when invalid arguements are entered', () => {
+      expect(fp.reduce.bind(fp)).to.throw(Error);
+      expect(fp.reduce.bind(fp, 1)).to.throw(Error);
+      expect(fp.reduce.bind(fp, [], 1)).to.throw(Error);
+      expect(fp.reduce.bind(fp, 'a', (val) => val)).to.throw(Error);
+    });
+  });
+
+  describe('#concat', () => {
+
+    it('Should return a new concated array', () => {
+      expect(fp.concat(testingArray, secondTestArray))
+      .to.deep.equal([1, 5, 7, 8, 9, 1, 1, 4]);
+    });
+
+    it('Should throw an error when invalid arguements are entered', () => {
+      expect(fp.concat.bind(fp)).to.throw(Error);
+      expect(fp.concat.bind(fp, [], 'a')).to.throw(Error);
+      expect(fp.concat.bind(fp, 'a', [])).to.throw(Error);
+    });
+  });
+  describe('#splice', () => {
+
+    it('Should return a new spliceed array', () => {
+      expect(fp.splice(testingArray, 0, 2)).to.deep.equal([1, 5]);
+      expect(fp.splice(testingArray, 0, 1, 4, 5, 6, 7)).to.deep.equal([7]);
+      expect(testingArray).to.deep.equal([4, 5, 6, 7, 8])
+    });
+
+    it('Should throw an error when invalid arguements are entered', () => {
+      expect(fp.splice.bind(fp)).to.throw(Error);
+      expect(fp.splice.bind(fp, 'a', 1)).to.throw(Error);
+      expect(fp.splice.bind(fp, 3, 'a')).to.throw(Error);
+    });
+  });
+});