algos

Author: Carlos Green

.DS_Store

@@ -38,4 +38,4 @@ function toString() {
       }
    }
    return retstr;
-}
+}

Chapter4Stacks/Chapter1/chap1-1.js

@@ -0,0 +1,36 @@
+function Stack() {
+  this.dataStore = []
+  this.top = 0
+  this.push = (element) => {
+    this.dataStore[this.top++] = element
+  }  
+  this.pop = () => {
+    return this.dataStore[--this.top]
+  } 
+  this.peek = () => {
+    return this.dataStore[this.top-1]
+  } 
+  this.length = () => {
+    return this.top
+  }
+  this.clear = () => {
+    for (let i = 0; i < this.top; i++) {
+      this.dataStore.pop()
+    }
+    this.top = 0
+    console.log(this.dataStore, 'data')
+  }
+}
+
+let st1 = new Stack()
+
+st1.push('nice')
+st1.push('cool')
+st1.push('sweet')
+st1.push('nice')
+
+console.log(st1.dataStore, 'store')
+st1.clear()
+console.log(st1.dataStore, 'store')
+st1.push('nice')
+console.log(st1.dataStore, 'store')