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Stack.js
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75 lines (62 loc) · 1.7 KB
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/* Stack!!
* A stack is exactly what it sounds like. An element gets added to the top of
* the stack and only the element on the top may be removed. This is an example
* of an array implementation of a Stack. So an element can only be added/removed
* from the end of the array.
*/
// Functions: push, pop, peek, view, length
//Creates a stack constructor
var Stack = (function () {
function Stack() {
//The top of the Stack
this.top = 0;
//The array representation of the stack
this.stack = new Array();
}
//Adds a value onto the end of the stack
Stack.prototype.push = function (value) {
this.stack[this.top] = value;
this.top++;
};
//Removes and returns the value at the end of the stack
Stack.prototype.pop = function () {
if (this.top === 0) {
return "Stack is Empty";
}
this.top--;
var result = this.stack[this.top];
delete this.stack[this.top];
return result;
};
//Returns the size of the stack
Stack.prototype.size = function () {
return this.top;
};
//Returns the value at the end of the stack
Stack.prototype.peek = function () {
return this.stack[this.top - 1];
}
//To see all the elements in the stack
Stack.prototype.view = function () {
for (var i = 0; i < this.top; i++)
console.log(this.stack[i]);
};
return Stack;
}());
//Implementation
var myStack = new Stack();
myStack.push(1);
myStack.push(5);
myStack.push(76);
myStack.push(69);
myStack.push(32);
myStack.push(54);
console.log(myStack.size());
console.log(myStack.peek());
console.log(myStack.pop());
console.log(myStack.peek());
console.log(myStack.pop());
console.log(myStack.peek());
myStack.push(55);
console.log(myStack.peek());
myStack.view();