Implement Custom Collection Processing Functions

index.js

@@ -0,0 +1,81 @@
+const myEach = (collection, callback) => {
+  Object.values(collection).forEach(callback)
+  return collection
+}
+
+const myMap = (collection, callback) => {
+  const returnArr = [];
+  Object.values(collection).forEach((value) => {
+    returnArr.push(callback(value))
+  })
+  return returnArr
+}
+
+const myReduce = (collection, callback, accum) => {
+  let accumulator = accum;
+  Object.values(collection).forEach((value, index) => {
+    if (index === 0 && accumulator === undefined) {
+      accumulator = value;
+    } else {
+      accumulator = callback(accumulator, value, Object.values(collection))
+    }
+  })
+  return accumulator
+}
+
+const myFind = (collection, predicate) => {
+  const values = Object.values(collection);
+  for (let i = 0; i < values.length; i++) {
+    if (predicate(values[i])) {
+      return values[i];
+    }
+  }
+  return undefined;
+}
+
+const myFilter = (collection, predicate) => {
+  const values = Object.values(collection);
+  const returnValues = [];
+  for (let i = 0; i < values.length; i++) {
+    if (predicate(values[i])) {
+      returnValues.push(values[i])
+    }
+  }
+  return returnValues;
+}
+
+const mySize = (collection) => {
+  let count = 0;
+  Object.values(collection).forEach((_) => count += 1)
+  return count;
+}
+
+const myFirst = (collection, n = 1) => {
+  const values = Object.values(collection);
+  const returnValues = [];
+  for (let i = 0; i < n; i++) {
+    returnValues.push(values[i])
+  }
+  return returnValues.length > 1 ? returnValues : returnValues[0];
+}
+
+const myLast = (collection, n = 1) => {
+  debugger
+  let result = myFirst(Object.values(collection).reverse(), n)
+  if (typeof result !== 'number') result = result.reverse()
+  return result
+}
+
+const myKeys = (object) => {
+  const keys = [];
+  for (let key in object) {
+    keys.push(key);
+  }
+  return keys;
+}
+
+const myValues = (object) => {
+  const values = [];
+  myKeys(object).forEach(value => values.push(object[value]))
+  return values
+}

package.json

@@ -4,7 +4,7 @@
   "description": "JavaScript Variables Lab for Learn.co",
   "main": "index.js",
   "scripts": {
-    "test": "mocha --timeout 5000 -R mocha-multi --reporter-options spec=-,json=.results.json"
+    "test": "mocha --timeout 5000 -b -R mocha-multi --reporter-options spec=-,json=.results.json"
   },
   "repository": {
     "type": "git",