Done

lab-phelan/.eslintignore

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+**/node_modules/*
+**/vendor/*
+**/*.min.js
+**/coverage/*
+**/build/*

lab-phelan/.eslintrc

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+{
+  "env": {
+    "browser": true,
+    "node": true,
+    "commonjs": true,
+    "jest": true,
+    "es6": true
+  },
+  "globals": {
+    "err": true,
+    "req": true,
+    "res": true,
+    "next": true
+  },
+  "extends": "eslint:recommended",
+  "parserOptions": {
+    "sourceType": "module"
+  },
+  "rules": {
+    "no-console": "off",
+    "indent": [ "error", 2 ],
+    "quotes": ["error", "single", { "allowTemplateLiterals": true }],
+    "comma-dangle": ["error", "always-multiline"],
+    "semi": [ "error", "always" ]
+  }
+}

lab-phelan/.gitignore

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+
+# Created by https://www.gitignore.io/api/node,linux
+
+### Linux ###
+*~
+
+# temporary files which can be created if a process still has a handle open of a deleted file
+.fuse_hidden*
+
+# KDE directory preferences
+.directory
+
+# Linux trash folder which might appear on any partition or disk
+.Trash-*
+
+# .nfs files are created when an open file is removed but is still being accessed
+.nfs*
+
+### 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
+
+
+# End of https://www.gitignore.io/api/node,linux

lab-phelan/README.md

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+In /lib, i have two .js files - both enumerate CommonJS-style modules, and pin them to 'module.exports' at the very end of the file.
+
+In 'greet.js', per the instructions, I returned a single function, sayHi(), which appends 'hello ' to the front of a string provided by the user... and, if the user send in input other than of Type 'string', it returns 'null'.
+
+In 'greet.js', per the instructions, I returned an Object, "Arith" with two functions within it; add() adds the two provided numbers together, and sub() subtracts them. In both functions, if either of the input values provided are not of Type 'number', I return 'null'.
+
+Easy.
+
+Beans.

lab-phelan/__test__/fp.test.js

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+const fp = require(`../lib/fp`);
+
+describe(`Testing suite for fp.js`, () => {
+
+  describe('fp.map()', () => {
+
+    test(`+ : "Concat Mixed Array"`, () => {
+      expect(fp.map(
+        input=>{return input + `stuff`;},
+        [1, 'test', null]
+      )).toEqual(['1stuff', 'teststuff', 'nullstuff']);
+    });
+
+    test(`- : "Callback not a function"`, () => {
+      expect (
+        () => {
+          fp.map(
+            'Throw : string, not function',
+            [1, 'test', null]
+          );
+        }
+      ).toThrow();
+    });
+
+    test(`- : "Collection not an array"`, () => {
+      expect (
+        () => {
+          fp.map(
+            input=>{return input + `stuff`;},
+            'Throw : string, not array'
+          );
+        }
+      ).toThrow();
+    });
+  });
+
+  describe('fp.filter()', () => {
+
+    test(`+ : "Filter Int Array"`, () => {
+      expect(fp.filter(
+        input=>{return input > 4;},
+        [2, 7, 2, 7, 2, 2, 7, 8, 1, 0, -1]
+      )).toEqual([7, 7, 7, 8]);
+    });
+
+    test(`- : "Callback not a function"`, () => {
+      expect (
+        () => {
+          fp.filter(
+            'Throw : string, not function',
+            [2, 7, 2, 7, 2, 2, 7, 8, 1, 0, -1]
+          );
+        }
+      ).toThrow();
+    });
+
+    test(`- : "Collection not an array"`, () => {
+      expect (
+        () => {
+          fp.filter(
+            input=>{return input > 4;},
+            'Throw : string, not array'
+          );
+        }
+      ).toThrow();
+    });
+  });
+
+  describe('fp.reduce()', () => {
+    test(`+ : "Sum Int Array"`, () => {
+      expect(fp.reduce(
+        (accumulator, currentValue) => {return accumulator + currentValue;},
+        10,
+        [4, 10, 15, 100, 1, 9]
+      )).toBe(149);
+    });
+
+    test(`- : "Callback not a function"`, () => {
+      expect (
+        () => {
+          fp.reduce(
+            'Throw : string, not function',
+            10,
+            [4, 10, 15, 100, 1, 9]
+          );
+        }
+      ).toThrow();
+    });
+
+    test(`- : "Collection not an array"`, () => {
+      expect (
+        () => {
+          fp.reduce(
+            (accumulator, currentValue) => {return accumulator + currentValue;},
+            10,
+            'Throw : string, not array'
+          );
+        }
+      ).toThrow();
+    });
+
+    test(`- : "If Collection is empty, initialState must be populated."`, () => {
+      expect (
+        () => {
+          fp.reduce(
+            (accumulator, currentValue) => {return accumulator + currentValue;},
+            [],
+            null
+          );
+        }
+      ).toThrow();
+    });
+  });
+
+  describe('fp.slice()', () => {
+    test(`+ : "Slice Array"`, () => {
+      expect(fp.slice(
+        1,
+        5,
+        ['4', 4, 'test', null, {}, 'okay', 110]
+      )).toEqual([4, 'test', null, {}]);
+    });
+
+    test(`- : "Collection not an Array"`, () => {
+      expect (
+        () => {
+          fp.slice(
+            1,
+            5,
+            'Throw : string, not array'
+          );
+        }
+      ).toThrow();
+    });
+
+    test(`- : "Begin and End must be integers"`, () => {
+      expect (
+        () => {
+          fp.slice(
+            'Throw : string, not integer',
+            {},
+            ['4', 4, 'test', null, {}, 'okay', 110]
+          );
+        }
+      ).toThrow();
+    });
+  });
+
+});

lab-phelan/lib/fp.js

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+'use strict';
+
+//map, filter, reduce, slice
+
+const Fp = module.exports = {};
+
+//Map:
+//Callback must be a function, Collection must be an array. Error otherwise.
+Fp.map = (callback, collection) => {
+  if (typeof callback !== 'function') {throw new TypeError(`Argument 'callback' is not a function.`);}
+  if (!Array.isArray(collection)) {throw new TypeError(`Argument 'collection' is not an array.`);}
+  return Array.prototype.map.call(collection, callback);
+};
+
+//Filter:
+//Callback must be a function, Collection must be an array. Error otherwise.
+Fp.filter = (callback, collection) => {
+  if (typeof callback !== 'function') {throw new TypeError(`Argument 'callback' is not a function.`);}
+  if (!Array.isArray(collection)) {throw new TypeError(`Argument 'collection' is not an array.`);}
+  return Array.prototype.filter.call(collection, callback);
+};
+
+//Reduce:
+//Callback must be a function, Collection must be an array. If Collection is empty, initialValue must have a value. Error otherwise.
+Fp.reduce = (callback, initialState, collection) => {
+  if (typeof callback !== 'function') {throw new TypeError(`Argument 'callback' is not a function.`);}
+  if (!Array.isArray(collection)) {throw new TypeError(`Argument 'collection' is not an array.`);}
+  if (collection.length===0 && !initialState) {throw new Error('In Array.prototype.reduce, initialValue cannot be falsy if collection is empty.');}
+  return Array.prototype.reduce.call(collection, callback, initialState);
+};
+
+//Slice:
+//Collection must be an Array, Begin and End must be integers. Error otherwise.
+Fp.slice = (begin, end, collection) => {
+  if (!Array.isArray(collection)) {throw new TypeError(`Argument 'collection' is not an array.`);}
+
+  let legalTypes = ['undefined', 'number'];
+
+  if (!legalTypes.includes(typeof begin) || !legalTypes.includes(typeof end) ) {throw new Error(`In Array.prototype.slice, input values for indexes can only be nonexistent (omitted), or a number. Arguments were '${begin}' and '${end}'`);}
+  return Array.prototype.slice.call(collection, begin, end);
+};
+
+module.exports = Fp;