Add core files

Author: bwreid

filter/core.js

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+function onlyEven (array) {
+  // your code here
+};
+
+function onlyOneWord (array) {
+  // your code here
+};
+
+function positiveRowsOnly (array) {
+  // your code here
+};
+
+function allSameVowels (array) {
+  // your code here
+};
+
+module.exports = {
+  onlyEven: onlyEven,
+  onlyOneWord: onlyOneWord,
+  positiveRowsOnly: positiveRowsOnly,
+  allSameVowels: allSameVowels
+};

map/core.js

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+function multiplyBy10 (array) {
+ // your code here
+};
+
+function shiftRight (array) {
+ // your code here
+};
+
+function onlyVowels (array) {
+ // your code here
+};
+
+function doubleMatrix (array) {
+ // your code here
+};
+
+module.exports = {
+  multiplyBy10: multiplyBy10,
+  shiftRight: shiftRight,
+  onlyVowels: onlyVowels,
+  doubleMatrix: doubleMatrix
+};

reduce/core.js

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+function sum (array) {
+  // your code here
+};
+
+function productAll (array) {
+  // your code here
+};
+
+function objectify (array) {
+  // your code here
+};
+
+function luckyNumbers (array) {
+  // your code here
+};
+
+module.exports = {
+  sum: sum,
+  productAll: productAll,
+  objectify: objectify,
+  luckyNumbers: luckyNumbers
+};

zoo/core.js

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+function entryCalculator (entrants) {
+  // your code here
+};
+
+function schedule (dayName) {
+  // your code here
+};
+
+function animalCount (species) {
+  // your code here
+};
+
+function animalMap (options) {
+  // your code here
+};
+
+function animalPopularity (rating) {
+  // your code here
+};
+
+function animalsByIds (ids) {
+  // your code here
+};
+
+function animalByName (animalName) {
+  // your code here
+};
+
+function employeesByIds (ids) {
+  // your code here
+};
+
+function employeeByName (employeeName) {
+  // your code here
+};
+
+function managersForEmployee (idOrName) {
+  // your code here
+};
+
+function employeeCoverage (idOrName) {
+  // your code here
+};
+
+
+module.exports = {
+  entryCalculator: entryCalculator,
+  schedule: schedule,
+  animalCount: animalCount,
+  animalMap: animalMap,
+  animalPopularity: animalPopularity,
+  animalsByIds: animalsByIds,
+  animalByName: animalByName,
+  employeesByIds: employeesByIds,
+  employeeByName: employeeByName,
+  managersForEmployee: managersForEmployee,
+  employeeCoverage: employeeCoverage
+}