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69 lines (46 loc) · 1.53 KB
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// Copyright 2020 Rajdeep Chandra
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
var Stack = function() {
this.count = 0;
this.storage = {};
// creating a function to add a value to the stack
this.push = function(value) {
this.storage[this.count] = value;
this.count++;
}
// creating a function to remove a value from the stack
this.pop = function(){
if(this.count === 0){
return undefined
}
this.count-- ;
var result = this.storage[this.count];
delete this.storage[this.count];
return result;
}
// creating a function to know the vlaue of items in the stack
this.size = function() {
return this.count;
}
// creating a function to see the last element in the stack
this.peek = function(){
return this.storage[this.count - 1]
}
}
var newStack = new Stack();
newStack.push(1);
newStack.push(2);
console.log(newStack.peek());
console.log(newStack.pop());
console.log(newStack.peek());