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8a9ea57f01
* fixed issue with delete operator using delete operator in arrays ,element remains undefined. so splice is the clean way to do that * Fixed the semicolon and let errors * Update Stack.js
73 lines
1.7 KiB
JavaScript
73 lines
1.7 KiB
JavaScript
/* Stack!!
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* A stack is exactly what it sounds like. An element gets added to the top of
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* the stack and only the element on the top may be removed. This is an example
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* of an array implementation of a Stack. So an element can only be added/removed
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* from the end of the array.
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*/
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// Functions: push, pop, peek, view, length
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// Creates a stack constructor
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var Stack = (function () {
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function Stack () {
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// The top of the Stack
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this.top = 0
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// The array representation of the stack
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this.stack = []
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}
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// Adds a value onto the end of the stack
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Stack.prototype.push = function (value) {
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this.stack[this.top] = value
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this.top++
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}
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// Removes and returns the value at the end of the stack
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Stack.prototype.pop = function () {
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if (this.top === 0) {
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return 'Stack is Empty'
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}
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this.top--
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var result = this.stack[this.top]
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this.stack = this.stack.splice(0, this.top)
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return result
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}
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// Returns the size of the stack
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Stack.prototype.size = function () {
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return this.top
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}
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// Returns the value at the end of the stack
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Stack.prototype.peek = function () {
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return this.stack[this.top - 1]
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}
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// To see all the elements in the stack
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Stack.prototype.view = function () {
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for (var i = 0; i < this.top; i++) { console.log(this.stack[i]) }
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}
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return Stack
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}())
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// Implementation
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var myStack = new Stack()
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myStack.push(1)
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myStack.push(5)
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myStack.push(76)
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myStack.push(69)
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myStack.push(32)
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myStack.push(54)
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console.log(myStack.size())
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console.log(myStack.peek())
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console.log(myStack.pop())
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console.log(myStack.peek())
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console.log(myStack.pop())
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console.log(myStack.peek())
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myStack.push(55)
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console.log(myStack.peek())
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myStack.view()
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