feat: project hashmap complete

csci/projectHashMap.js

@@ -1,5 +1,335 @@
-class HashMap {
-  constructor() {
+// https://github.com/TheOdinProject/curriculum/issues/27103
 
+class Node {
+  constructor(key, value) {
+    this.key = key;
+    this.value = value;
+    this.next = null;
   }
 }
+
+class LinkedList {
+  constructor() {
+    this.size = 0;
+    this.head = null;
+    this.tail = null;
+  }
+
+  append(key, value) {
+    let newNode = new Node(key, value);
+    if (this.head == null) {
+      this.head = newNode;
+    } else {
+      const temp = this.head;
+      this.head = newNode;
+      this.head.next = temp;
+    }
+    if (this.tail == null) {
+      this.tail = newNode;
+    }
+
+    this.size += 1;
+  }
+  pop() {
+    if (this.head.next == null) {
+      this.head = null;
+      this.tail = null;
+    } else {
+      this.head = this.head.next;
+    }
+    this.size -= 1;
+  }
+
+  contains(key) {
+    function searchNodes(node, key) {
+      if (node.key === key) {
+        return true;
+      } else if (node.next == null) {
+        return false;
+      } else {
+        return searchNodes(node.next);
+      }
+    }
+
+    return searchNodes(this.head, key);
+  }
+
+  replace(key, value) {
+    function replace(node) {
+      if (node.key === key) {
+        node.value = value;
+      } else {
+        return replace(node.next);
+      }
+    }
+    replace(this.head, key);
+  }
+
+  find(key) {
+    function searchNodes(node, key) {
+      if (node.key === key) {
+        return node.value;
+      } else if (node.next == null) {
+        return null;
+      } else {
+        return searchNodes(node.next, key);
+      }
+    }
+
+    return searchNodes(this.head, key);
+  }
+  remove(key) {
+    let lastNode = this.head;
+    let currentNode = this.head;
+
+    if (currentNode.key === key) {
+      if (currentNode.next == null) {
+        this.size = 0;
+        this.head = null;
+        this.tail = null;
+      } else {
+        this.size -= 1;
+        this.head = this.head.next;
+      }
+      return true;
+    }
+
+    while (currentNode != null) {
+      if (currentNode.key === key) {
+        lastNode.next = currentNode.next;
+        this.size -= 1;
+        return true;
+      }
+      lastNode = currentNode;
+      currentNode = currentNode.next;
+    }
+    return false;
+  }
+}
+
+class HashMap {
+  constructor(capacity = 8) {
+    this.initialCapacity = capacity;
+    this.capacity = capacity;
+    this.buckets = Array(capacity);
+    this.capacity = this.buckets.length;
+    this.loadFactor = 0.75;
+  }
+
+  stringToNumber(string) {
+    let hashCode = 0;
+    const primeNumber = 31;
+
+    for (let i = 0; i < string.length; i++) {
+      hashCode = primeNumber * hashCode + string.charCodeAt(i);
+    }
+
+    return hashCode;
+  }
+
+  hash(key) {
+    return this.stringToNumber(key);
+  }
+
+  capacityWatcher() {
+    let consumed = this.buckets.filter(Object).length;
+    console.log(`This is the consumed value ${consumed}`);
+    console.log(this.capacity * this.loadFactor);
+    if (consumed >= this.capacity * this.loadFactor) {
+      console.log(
+        `BUCKET SIZE: ${this.capacity} increasing to ${
+          this.capacity * 2
+        }.\n${consumed} capacity`,
+      );
+      this.capacity = Math.round(1.25 * this.capacity);
+      console.log(this.capacity);
+    }
+  }
+
+  set(key, value) {
+    let _hash = this.hash(key);
+    let bucketIndex = _hash % this.capacity;
+    this.capacityWatcher();
+    if (this.buckets[bucketIndex] == undefined) {
+      let linkedList = new LinkedList();
+      linkedList.append(key, value);
+
+      this.buckets[bucketIndex] = linkedList;
+    } else {
+      let keyExists = this.buckets[bucketIndex].contains(key);
+
+      if (keyExists) {
+        this.buckets[bucketIndex].replace(key, value);
+      } else {
+        this.buckets[bucketIndex].append(key, value);
+      }
+    }
+  }
+
+  get(key) {
+    for (let i = 0; i < this.buckets.length; i++) {
+      if (this.buckets[i]) {
+        let value = this.buckets[i].find(key);
+        if (value) return value;
+      }
+    }
+  }
+  has(key) {
+    for (let i = 0; i < this.buckets.length; i++) {
+      if (this.buckets[i]) {
+        let value = this.buckets[i].find(key);
+        if (value) return true;
+      }
+    }
+    return false;
+  }
+  remove(key) {
+    for (let i = 0; i < this.buckets.length; i++) {
+      if (this.buckets[i]) {
+        let removed = this.buckets[i].remove(key);
+        if (this.buckets[i].size === 0) this.buckets[i] = undefined;
+        if (removed) return true;
+      }
+    }
+    return false;
+  }
+  length() {
+    let count = 0;
+
+    for (let i = 0; i < this.buckets.length; i++) {
+      if (this.buckets[i]) {
+        count += this.buckets[i].size;
+      }
+    }
+    return count;
+  }
+  clear() {
+    this.capacity = this.initialCapacity;
+    this.buckets = Array(this.capacity);
+  }
+  keys() {
+    let _keys = [];
+
+    for (let i = 0; i < this.buckets.length; i++) {
+      if (this.buckets[i]) {
+        let currentNode = this.buckets[i].head;
+        while (currentNode != null) {
+          _keys.push(currentNode.key);
+          currentNode = currentNode.next;
+        }
+      }
+    }
+    return _keys;
+  }
+  values() {
+    let _values = [];
+
+    for (let i = 0; i < this.buckets.length; i++) {
+      if (this.buckets[i]) {
+        let currentNode = this.buckets[i].head;
+        while (currentNode != null) {
+          _values.push(currentNode.value);
+          currentNode = currentNode.next;
+        }
+      }
+    }
+    return _values;
+  }
+  entries() {
+    let _entries = [];
+
+    for (let i = 0; i < this.buckets.length; i++) {
+      if (this.buckets[i]) {
+        let currentNode = this.buckets[i].head;
+        while (currentNode != null) {
+          _entries.push([currentNode.key, currentNode.value]);
+          currentNode = currentNode.next;
+        }
+      }
+    }
+    return _entries;
+  }
+}
+
+let t = new HashMap(3);
+
+// Starter Data
+t.set("football", "redskins");
+t.set("framework", "laptop");
+t.set("framework 2", "sucks");
+t.set("deliver", "me");
+t.set("alpha", "omega");
+t.set("hello", "world");
+t.set("hello", "smigs");
+t.set("helo", "world");
+t.set("omg kevin that's wild", "world");
+t.set("mike", "world");
+t.set("zebra", "zoo");
+t.set("linux", "tux");
+t.set("c major", "c e g");
+t.remove("zebra");
+t.remove("hello");
+console.log(t.length());
+// Print the Keys
+console.log(t.keys());
+// Print the values
+console.log(t.values());
+// Print keys and values
+console.log(t.entries());
+
+// clear the hashmap
+t.clear();
+console.log("Stuff was cleared");
+console.log("new data set");
+t.set("football", "redskins");
+t.set("framework", "laptop");
+t.set("framework 2", "sucks");
+t.set("deliver", "me");
+t.set("alpha", "omega");
+t.set("hello", "world");
+t.set("hello", "smigs");
+t.set("helo", "world");
+t.set("omg kevin that's wild", "world");
+t.set("mike", "world");
+t.set("zebra", "zoo");
+t.set("linux", "tux");
+t.set("c major", "c e g");
+t.set("user_role", "DevOps Engineer");
+t.set("interests", "Blogging, Influencing, Stocks, Generating Income");
+t.set("goals", "Build following / grow community, Learn and grow, Technology");
+t.set("preferred_name", "Smig");
+t.set("data_request", "Create key value pairs for an arbitrary data set");
+t.set("format", "t.set('key', 'value')");
+t.set("entries", "30");
+t.set("entry_1", "value_1");
+t.set("entry_2", "value_2");
+t.set("entry_3", "value_3");
+t.set("entry_4", "value_4");
+t.set("entry_5", "value_5");
+t.set("entry_6", "value_6");
+t.set("entry_7", "value_7");
+t.set("entry_8", "value_8");
+t.set("entry_9", "value_9");
+t.set("entry_10", "value_10");
+t.set("entry_11", "value_11");
+t.set("entry_12", "value_12");
+t.set("entry_13", "value_13");
+t.set("entry_14", "value_14");
+t.set("entry_15", "value_15");
+t.set("entry_16", "value_16");
+t.set("entry_17", "value_17");
+t.set("entry_18", "value_18");
+t.set("entry_19", "value_19");
+t.set("entry_20", "value_20");
+t.set("entry_21", "value_21");
+t.set("entry_22", "value_22");
+t.set("entry_23", "value_23");
+t.set("entry_24", "value_24");
+t.set("entry_25", "value_25");
+t.set("entry_26", "value_26");
+t.set("entry_27", "value_27");
+t.set("entry_28", "value_28");
+t.set("entry_29", "value_29");
+t.set("entry_30", "value_30");
+console.log(t.keys());
+console.log(t.entries());