diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..f9f60d0
Binary files /dev/null and b/.DS_Store differ
diff --git a/README.md b/README.md
deleted file mode 100644
index 2572071..0000000
--- a/README.md
+++ /dev/null
@@ -1,18 +0,0 @@
-# Heaps Practice
-Based on the Ruby version at [Ada-C12/heaps](https://github.com/Ada-C12/heaps). See also: [AdaGold/heaps](https://github.com/AdaGold/heaps)
-
-## Running
-To run this repo, clone and install it, then run tests. It has been tested with node `12.6.0`.
-
-```sh
-git clone git@github.com:mmcknett/heaps-js
-cd heap-js
-npm ci
-npm t
-```
-
-Not also that Mocha has watch mode:
-
-```sh
-npm t -- --watch
-```
diff --git a/heapsort.js b/heapsort.js
new file mode 100644
index 0000000..5d98d44
--- /dev/null
+++ b/heapsort.js
@@ -0,0 +1,25 @@
+// const MinHeap = require('./minheap.js')
+const { MinHeap } = require('./minheap');
+// This method uses a heap to sort an array.
+// Time Complexity:  O(n log n) - add is log n, adding n times + remove is log n --> O(2(n log n)) -> O(n log n)
+// Space Complexity: O(n)
+
+function heapsort(list) {
+  let myHeap = new MinHeap;
+
+  for (let i = 0; i < list.length; i++) {
+    myHeap.add(list[i]);  
+  }
+
+  let result = [];
+  while (!myHeap.isEmpty()) {
+    let node = myHeap.remove();
+    result.push(node)
+  }
+
+  return result;
+};
+
+module.exports = heapsort;
+
+console.log(heapsort([5, 27, 3, 16, -50])); 
\ No newline at end of file
diff --git a/lib/heapsort.js b/lib/heapsort.js
deleted file mode 100644
index 69d5af2..0000000
--- a/lib/heapsort.js
+++ /dev/null
@@ -1,8 +0,0 @@
-// This method uses a heap to sort an array.
-// Time Complexity:  ?
-// Space Complexity: ?
-function heapsort(list) {
-  throw new Error('Method not implemented yet...');
-};
-
-module.exports = heapsort;
diff --git a/lib/minheap.js b/lib/minheap.js
deleted file mode 100644
index 4efceaf..0000000
--- a/lib/minheap.js
+++ /dev/null
@@ -1,72 +0,0 @@
-class HeapNode {
-  constructor(key, value) {
-    this.key = key;
-    this.value = value;
-  }
-}
-
-class MinHeap {
-  constructor() {
-    this.store = [];
-  }
-
-  // This method adds a HeapNode instance to the heap
-  // Time Complexity: ?
-  // Space Complexity: ?
-  add(key, value = key) {
-    throw new Error("Method not implemented yet...");
-  }
-
-  // This method removes and returns an element from the heap
-  //   maintaining the heap structure
-  // Time Complexity: ?
-  // Space Complexity: ?
-  remove() {
-    throw new Error("Method not implemented yet...");
-  }
-
-
-  // Used for Testing
-  toString() {
-    if (!this.store.length) {
-      return "[]";
-    }
-
-    const values = this.store.map(item => item.value);
-    const output = `[${values.join(', ')}]`;
-    return output;
-  }
-
-  // This method returns true if the heap is empty
-  // Time complexity: ?
-  // Space complexity: ?
-  isEmpty() {
-    throw new Error("Method not implemented yet...");
-  }
-
-  // This helper method takes an index and
-  //  moves it up the heap, if it is less than it's parent node.
-  //  It could be **very** helpful for the add method.
-  // Time complexity: ?
-  // Space complexity: ?
-  heapUp(index) {
-    throw new Error("Method not implemented yet...");
-  }
-
-  // This helper method takes an index and 
-  //  moves it up the heap if it's smaller
-  //  than it's parent node.
-  heapDown(index) {
-    throw new Error("Method not implemented yet...");
-  }
-
-  // If you want a swap method... you're welcome
-  swap(index1, index2) {
-    const s = this.store;
-    [s[index1], s[index2]] = [s[index2], s[index1]];
-  }
-}
-
-module.exports = {
-  MinHeap
-};
diff --git a/maxheap.js b/maxheap.js
new file mode 100644
index 0000000..80da378
--- /dev/null
+++ b/maxheap.js
@@ -0,0 +1,149 @@
+class HeapNode {
+  constructor(key, value) {
+    this.key = key;
+    this.value = value;
+  }
+}
+
+class MaxHeap {
+  constructor() {
+    this.store = [];
+    this.size = 0;
+  }
+
+  // This method adds a HeapNode instance to the heap
+  // Time Complexity: O(log n)
+  // Space Complexity: O(1)
+  add(key, value) {
+    let newNode = new HeapNode(key, value);
+    this.store.push(newNode);
+
+    let current = this.store.length - 1;
+    this.heapUp(current);
+    this.size++;
+  }
+
+  // This method removes and returns an element from the heap
+  //   maintaining the heap structure
+  // Time Complexity: O(log n)
+  // Space Complexity: O(1)
+  remove() {
+    let result;
+
+    if (this.size === 0) {
+      return result
+    }
+
+    if (this.size === 1) {
+      result = this.store.pop();
+      this.size--;
+      return result.value
+    }
+
+    this.swap(0, this.store.length - 1);
+    result = this.store.pop();
+    this.heapDown(0)
+
+    this.size--;
+    return result.value;
+  }
+
+
+  // Used for Testing
+  toString() {
+    if (!this.store.length) {
+      return "[]";
+    }
+
+    const values = this.store.map(item => item.value);
+    const output = `[${values.join(', ')}]`;
+    return output;
+  }
+
+  // This method returns true if the heap is empty
+  // Time complexity: O(1)
+  // Space complexity: O(1)
+  isEmpty() {
+    return this.store.length === 0
+  }
+
+  // This helper method takes an index and
+  //  moves it up the heap, if it is less than it's parent node.
+  //  It could be **very** helpful for the add method.
+  // Time complexity: O(log n) - n: nodes in heap
+  // Space complexity: O(1) - no recursive calls
+  heapUp(index) {
+
+    let parentIndex = index % 2 === 0 ? (index - 2) / 2 : (index - 1) / 2;
+
+    while( index > 0 && (this.store[parentIndex].key < this.store[index].key)) {
+      this.swap(index, parentIndex);
+      index = parentIndex;
+      parentIndex = index % 2 === 0 ? (index - 2) / 2 : (index - 1) / 2;
+    }
+  }
+
+  // This helper method takes an index and 
+  //  moves it up the heap if it's smaller
+  //  than it's parent node.
+  // Time complexity: O(log n) - n: nodes in heap
+  // Space complexity: O(1) - no recursive calls
+  heapDown(index) {
+    // console.log(this.store.length)
+
+    let leftChild = index * 2 + 1;
+    let rightChild = index * 2 + 2;
+
+    while ( this.store[leftChild] || this.store[rightChild]) {
+      if (this.store[leftChild] === undefined) {
+        if (this.store[rightChild].key > this.store[index].key) {
+          this.swap(index, rightChild);
+        }
+          index = rightChild;
+      } else if (this.store[rightChild] === undefined) {
+        if (this.store[leftChild].key > this.store[index].key) {
+          this.swap(index, leftChild);
+        }
+          index = leftChild;
+      } else if (this.store[leftChild].key >= this.store[rightChild].key && this.store[leftChild].key > this.store[index].key) {
+        this.swap(index, leftChild);
+        index = leftChild;
+      } else if (this.store[rightChild].key > this.store[leftChild].key && this.store[rightChild].key > this.store[index].key) {
+        this.swap(index, rightChild);
+        index = rightChild;
+      } else {
+        return index
+      }
+
+      leftChild = index * 2 + 1;
+      rightChild = index * 2 + 2;
+    }
+  }
+
+  // If you want a swap method... you're welcome
+  swap(index1, index2) {
+    const s = this.store;
+    let temp = s[index1];
+    s[index1] = s[index2];
+    s[index2] = temp 
+    // [s[index1], s[index2]] = [s[index2], s[index1]];
+  }
+}
+
+module.exports = {MaxHeap};
+
+
+let myHeap = new MaxHeap;
+myHeap.add(6,6);
+myHeap.add(8,8);
+myHeap.add(2,2);
+myHeap.add(7,7); 
+myHeap.add(13,13); 
+console.log(myHeap.toString())
+myHeap.remove();
+myHeap.remove();
+myHeap.remove();
+myHeap.remove();
+myHeap.remove();
+myHeap.remove();
+console.log(myHeap.toString())
diff --git a/minheap.js b/minheap.js
new file mode 100644
index 0000000..3e32f15
--- /dev/null
+++ b/minheap.js
@@ -0,0 +1,145 @@
+class HeapNode {
+  constructor(key, value) {
+    this.key = key;
+    this.value = value;
+  }
+}
+
+class MinHeap {
+  constructor() {
+    this.store = [];
+  }
+
+  // This method adds a HeapNode instance to the heap
+  // Time Complexity: O(log n)
+  // Space Complexity: O(1)
+  add(key, value = key) {
+    let newNode = new HeapNode(key, value);
+    this.store.push(newNode);
+
+    let current = this.store.length - 1;
+    this.heapUp(current);
+  }
+
+  // This method removes and returns an element from the heap
+  //   maintaining the heap structure
+  // Time Complexity: O(log n)
+  // Space Complexity: O(1)
+  remove() {
+    let result;
+
+    if (this.store.length === 0) {
+      return result
+    }
+
+    if (this.size === 1) {
+      result = this.store.pop();
+      return result.value
+    }
+
+
+    this.swap(0, this.store.length - 1);
+    result = this.store.pop();
+    this.heapDown(0)
+
+    return result.value;
+  }
+
+
+  // Used for Testing
+  toString() {
+    if (!this.store.length) {
+      return "[]";
+    }
+
+    const values = this.store.map(item => item.value);
+    const output = `[${values.join(', ')}]`;
+    return output;
+  }
+
+  // This method returns true if the heap is empty
+  // Time complexity: O(1)
+  // Space complexity: O(1)
+  isEmpty() {
+    return this.store.length === 0
+  }
+
+  // This helper method takes an index and
+  //  moves it up the heap, if it is less than it's parent node.
+  //  It could be **very** helpful for the add method.
+  // Time complexity: O(log n) - n: nodes in heap
+  // Space complexity: O(1) - no recursive calls
+  heapUp(index) {
+
+    let parentIndex = index % 2 === 0 ? (index - 2) / 2 : (index - 1) / 2;
+
+    while( index > 0 && (this.store[parentIndex].key > this.store[index].key)) {
+      this.swap(index, parentIndex);
+      index = parentIndex;
+      parentIndex = index % 2 === 0 ? (index - 2) / 2 : (index - 1) / 2;
+    }
+  }
+
+  // This helper method takes an index and 
+  //  moves it up the heap if it's smaller
+  //  than it's parent node.
+  // Time complexity: O(log n) - n: nodes in heap
+  // Space complexity: O(1) - no recursive calls
+  heapDown(index) {
+    // console.log(this.store.length)
+
+    let leftChild = index * 2 + 1;
+    let rightChild = index * 2 + 2;
+
+    while ( this.store[leftChild] || this.store[rightChild]) {
+      if (this.store[leftChild] === undefined) {
+        if (this.store[rightChild].key < this.store[index].key) {
+          this.swap(index, rightChild);
+        }
+          index = rightChild;
+      } else if (this.store[rightChild] === undefined) {
+        if (this.store[leftChild].key < this.store[index].key) {
+          this.swap(index, leftChild);
+        }
+          index = leftChild;
+      }else if (this.store[leftChild].key <= this.store[rightChild].key && this.store[leftChild].key < this.store[index].key) {
+        this.swap(index, leftChild);
+        index = leftChild;
+      } else if (this.store[leftChild].key > this.store[rightChild].key && this.store[rightChild].key < this.store[index].key){
+        this.swap(index, rightChild);
+        index = rightChild;
+      } else {
+        return
+      }
+
+      leftChild = index * 2 + 1;
+      rightChild = index * 2 + 2;
+    }
+  }
+
+  // If you want a swap method... you're welcome
+  swap(index1, index2) {
+    const s = this.store;
+    [s[index1], s[index2]] = [s[index2], s[index1]];
+  }
+}
+
+module.exports = MinHeap;
+
+
+// let myHeap = new MinHeap;
+// // console.log(myHeap.isEmpty())
+// myHeap.add(6);
+// // console.log(myHeap)
+// myHeap.add(4);
+// // console.log(myHeap)
+// myHeap.add(7);
+// myHeap.add(3); 
+// // console.log(myHeap)
+// console.log(myHeap.remove())
+// console.log(myHeap.remove())
+// console.log(myHeap.remove())
+// console.log(myHeap.remove())
+// console.log(myHeap.remove())
+// // console.log(myHeap.toString())
+// // console.log(myHeap.isEmpty())
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
deleted file mode 100644
index b65fb67..0000000
--- a/package-lock.json
+++ /dev/null
@@ -1,1053 +0,0 @@
-{
-  "name": "heaps",
-  "version": "1.0.0",
-  "lockfileVersion": 1,
-  "requires": true,
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-      "dev": true
-    },
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-      }
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-          "dev": true
-        },
-        "yargs": {
-          "version": "12.0.5",
-          "resolved": "https://registry.npmjs.org/yargs/-/yargs-12.0.5.tgz",
-          "integrity": "sha512-Lhz8TLaYnxq/2ObqHDql8dX8CJi97oHxrjUcYtzKbbykPtVW9WB+poxI+NM2UIzsMgNCZTIf0AQwsjK5yMAqZw==",
-          "dev": true,
-          "requires": {
-            "cliui": "^4.0.0",
-            "decamelize": "^1.2.0",
-            "find-up": "^3.0.0",
-            "get-caller-file": "^1.0.1",
-            "os-locale": "^3.0.0",
-            "require-directory": "^2.1.1",
-            "require-main-filename": "^1.0.1",
-            "set-blocking": "^2.0.0",
-            "string-width": "^2.0.0",
-            "which-module": "^2.0.0",
-            "y18n": "^3.2.1 || ^4.0.0",
-            "yargs-parser": "^11.1.1"
-          }
-        },
-        "yargs-parser": {
-          "version": "11.1.1",
-          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-11.1.1.tgz",
-          "integrity": "sha512-C6kB/WJDiaxONLJQnF8ccx9SEeoTTLek8RVbaOIsrAUS8VrBEXfmeSnCZxygc+XC2sNMBIwOOnfcxiynjHsVSQ==",
-          "dev": true,
-          "requires": {
-            "camelcase": "^5.0.0",
-            "decamelize": "^1.2.0"
-          }
-        }
-      }
-    }
-  }
-}
diff --git a/package.json b/package.json
deleted file mode 100644
index 1f7db3b..0000000
--- a/package.json
+++ /dev/null
@@ -1,23 +0,0 @@
-{
-  "name": "heaps",
-  "version": "1.0.0",
-  "description": "Heaps practice based on https://github.com/Ada-C11/heaps",
-  "main": "index.js",
-  "scripts": {
-    "test": "mocha"
-  },
-  "repository": {
-    "type": "git",
-    "url": "git+https://github.com/mmcknett/heaps-js.git"
-  },
-  "author": "mmcknett",
-  "license": "ISC",
-  "bugs": {
-    "url": "https://github.com/mmcknett/heaps-js/issues"
-  },
-  "homepage": "https://github.com/mmcknett/heaps-js#readme",
-  "devDependencies": {
-    "chai": "^4.2.0",
-    "mocha": "^6.2.0"
-  }
-}
diff --git a/priority_queue.js b/priority_queue.js
new file mode 100644
index 0000000..a249c2c
--- /dev/null
+++ b/priority_queue.js
@@ -0,0 +1,148 @@
+class HeapNode {
+  constructor(priority, value) {
+    this.priority = priority;
+    this.value = value;
+  }
+}
+
+class PriorityQueue {
+  constructor() {
+    this.store = [];
+    this.size = 0;
+  }
+
+  // This method adds a HeapNode instance to the heap
+  // Time Complexity: O(log n)
+  // Space Complexity: O(1)
+  add(priority, value) {
+    let newNode = new HeapNode(priority, value);
+    this.store.push(newNode);
+
+    let current = this.store.length - 1;
+    this.heapUp(current);
+    this.size++;
+  }
+
+  // This method removes and returns an element from the heap
+  //   maintaining the heap structure
+  // Time Complexity: O(log n)
+  // Space Complexity: O(1)
+  remove() {
+    let result;
+
+    if (this.size === 0) {
+      return result
+    }
+
+    if (this.size === 1) {
+      result = this.store.pop();
+      this.size--;
+      return result.value
+    }
+
+    this.swap(0, this.store.length - 1);
+    result = this.store.pop();
+    this.heapDown(0)
+
+    this.size--;
+    return result.value;
+  }
+
+
+  // Used for Testing
+  toString() {
+    if (!this.store.length) {
+      return "[]";
+    }
+
+    const values = this.store.map(item => item.value);
+    const output = `[${values.join(', ')}]`;
+    return output;
+  }
+
+  // This method returns true if the heap is empty
+  // Time complexity: O(1)
+  // Space complexity: O(1)
+  isEmpty() {
+    return this.store.length === 0
+  }
+
+  // This helper method takes an index and
+  //  moves it up the heap, if it is less than it's parent node.
+  //  It could be **very** helpful for the add method.
+  // Time complexity: O(log n) - n: nodes in heap
+  // Space complexity: O(1) - no recursive calls
+  heapUp(index) {
+
+    let parentIndex = index % 2 === 0 ? (index - 2) / 2 : (index - 1) / 2;
+
+    while( index > 0 && (this.store[parentIndex].priority > this.store[index].priority)) {
+      this.swap(index, parentIndex);
+      index = parentIndex;
+      parentIndex = index % 2 === 0 ? (index - 2) / 2 : (index - 1) / 2;
+    }
+  }
+
+  // This helper method takes an index and 
+  //  moves it up the heap if it's smaller
+  //  than it's parent node.
+  // Time complexity: O(log n) - n: nodes in heap
+  // Space complexity: O(1) - no recursive calls
+  heapDown(index) {
+    // console.log(this.store.length)
+
+    let leftChild = index * 2 + 1;
+    let rightChild = index * 2 + 2;
+
+    while ( this.store[leftChild] || this.store[rightChild]) {
+      if (this.store[leftChild] === undefined) {
+        if (this.store[rightChild].priority < this.store[index].priority) {
+          this.swap(index, rightChild);
+        }
+          index = rightChild;
+      } else if (this.store[rightChild] === undefined) {
+        if (this.store[leftChild].priority < this.store[index].priority) {
+          this.swap(index, leftChild);
+        }
+          index = leftChild;
+      } else if (this.store[leftChild].priority <= this.store[rightChild].priority && this.store[leftChild].priority < this.store[index].priority) {
+        this.swap(index, leftChild);
+        index = leftChild;
+      } else if (this.store[rightChild].priority < this.store[leftChild].priority && this.store[rightChild].priority < this.store[index].priority) {
+        this.swap(index, rightChild);
+        index = rightChild;
+      } else {
+        return index
+      }
+
+      leftChild = index * 2 + 1;
+      rightChild = index * 2 + 2;
+    }
+  }
+
+  // If you want a swap method... you're welcome
+  swap(index1, index2) {
+    const s = this.store;
+    let temp = s[index1];
+    s[index1] = s[index2];
+    s[index2] = temp 
+    // [s[index1], s[index2]] = [s[index2], s[index1]];
+  }
+}
+
+module.exports = PriorityQueue;
+
+
+let ER = new PriorityQueue;
+ER.add(3,"Low Fever");
+ER.add(1,"Concussion");
+ER.add(3,"Minor Allergy");
+ER.add(1,"Stitches"); 
+ER.add(2,"Ankle Sprain"); 
+console.log(ER.toString())
+console.log(ER.remove())
+console.log(ER.remove())
+console.log(ER.remove())
+console.log(ER.remove())
+console.log(ER.remove())
+// console.log(ER.remove())
diff --git a/test/heapsort.test.js b/test/heapsort.test.js
deleted file mode 100644
index a34282b..0000000
--- a/test/heapsort.test.js
+++ /dev/null
@@ -1,36 +0,0 @@
-const expect = require('chai').expect;
-
-describe.skip("heapsort", function() {
-  it("sorts an empty array", function() {
-    // Arrange 
-    const list = [];
-
-    // Act
-    const result = heapsort(list);
-
-    // Assert
-    expect(result).to.eql([]); // Note: use eql for deep equality
-  });
-
-  it("can sort a 1-element array", function() {
-    // Arrange 
-    const list = [5];
-
-    // Act
-    const result = heapsort(list);
-
-    // Assert
-    expect(result).to.eql([5]);
-  });
-  
-  it("can sort a 5-element array", function() {
-    // Arrange 
-    const list = [5, 27, 3, 16, -50];
-
-    // Act
-    const result = heapsort(list);
-
-    // Assert
-    expect(result).to.eql([-50, 3, 5, 16, 27]);
-  });
-});
diff --git a/test/minheap.test.js b/test/minheap.test.js
deleted file mode 100644
index c1ca416..0000000
--- a/test/minheap.test.js
+++ /dev/null
@@ -1,142 +0,0 @@
-const expect = require('chai').expect;
-const { MinHeap } = require('../lib/minheap');
-
-describe('Heap', function() {
-  let heap;
-
-  beforeEach(function() {
-    heap = new MinHeap();
-  });
-
-  it('can be created', function() {
-    
-    // Assert
-    expect(heap).to.be.an.instanceOf(MinHeap);
-  });
-
-  it('can have nodes added', function() {
-    // Arrange/Act
-    const addSomethingToHeap = function () {
-      heap.add(10, 'someValue');
-    }
-
-    // Assert
-    expect(heap.add).not.to.be.undefined;
-    expect(addSomethingToHeap).not.to.throw();
-  });
-
-  it('adds one node properly', function() {
-    // Arrange
-    heap.add(3, 'Pasta');
-
-    // Act
-    const output = heap.toString();
-
-    // Assert
-
-    expect(output).to.equal('[Pasta]');
-  });
-
-  it('adds two node properly', function() {
-    // Arrange
-    heap.add(3, 'Pasta');
-    heap.add(1, 'Pizza');
-
-    // Act
-    const output = heap.toString();
-
-    // Assert
-
-    expect(output).to.equal('[Pizza, Pasta]');
-  });
-
-  it('adds nodes in a proper order', function() {
-    // Arrange
-    heap.add(3, 'Pasta');
-    heap.add(6, 'Soup');
-    heap.add(1, 'Pizza');
-
-    // Act
-    const output = heap.toString();
-
-    // Assert
-
-    expect(output).to.equal('[Pizza, Soup, Pasta]');
-  });
-
-  it('adds nodes in a proper order with a lot of nodes', function() {
-    // Arrange
-    heap.add(3, 'Pasta');
-    heap.add(6, 'Soup');
-    heap.add(1, 'Pizza');
-    heap.add(0, 'Donuts');
-    heap.add(16, 'Cookies');
-    heap.add(57, 'Cake');
-
-    // Act
-    const output = heap.toString();
-
-    // Assert
-
-    expect(output).to.equal('[Donuts, Pizza, Pasta, Soup, Cookies, Cake]');
-  });
-
-  it('can remove one node in the proper order', function() {
-    // Arrange
-    heap.add(3, 'Pasta');
-    heap.add(6, 'Soup');
-    heap.add(1, 'Pizza');
-    heap.add(0, 'Donuts');
-    heap.add(16, 'Cookies');
-    heap.add(57, 'Cake');
-
-    // Act
-    const removed = heap.remove();
-
-    // Assert
-    expect(removed).to.equal('Donuts');
-  });
-
-  it('can remove two nodes in the proper order', function() {
-    // Arrange
-    heap.add(3, 'Pasta');
-    heap.add(6, 'Soup');
-    heap.add(1, 'Pizza');
-    heap.add(0, 'Donuts');
-    heap.add(16, 'Cookies');
-    heap.add(57, 'Cake');
-
-    // Act
-    heap.remove();
-    const removed = heap.remove();
-
-    // Assert
-    expect(removed).to.equal('Pizza');
-  });
-
-  it('can remove three nodes in the proper order', function() {
-    // Arrange
-    heap.add(3, 'Pasta');
-    heap.add(6, 'Soup');
-    heap.add(1, 'Pizza');
-    heap.add(0, 'Donuts');
-    heap.add(16, 'Cookies');
-    heap.add(57, 'Cake');
-
-    // Act
-    heap.remove();
-    heap.remove();
-    const removed = heap.remove();
-
-    // Assert
-    expect(removed).to.equal('Pasta');
-  });
-
-  it('does nothing when removing from an empty heap', function() {
-    // Act
-    const removed = heap.remove();
-
-    // Assert
-    expect(removed).to.be.undefined;
-  });
-});
\ No newline at end of file