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GeezerVison is showing github.com — JavaScript/Data-Structures/Stack/StackES6.js at master · TheAlgorithms/JavaScript Expand file tree/ Copy pathStackES6.jsMore file actions 57 lines (49 loc) · 1.44 KB / Copy pathStackES6.jsFile metadata and controls57 lines (49 loc) · 1.44 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 /* Stack data-structure. It's work is based on the LIFO method (last-IN-first-OUT). * It means that elements added to the stack are placed on the top and only the * last element (from the top) can be reached. After we get access to the last * element, he pops from the stack. * This is a class-based implementation of a Stack. It provides functions * 'push' - to add an element, 'pop' - to remove an element from the top. * Also it implements 'length', 'last' and 'isEmpty' properties and * static isStack method to check is an object the instance of Stack class. */ // Class declaration class Stack { constructor() { this.stack = [] this.top = 0 } // Adds a value to the end of the Stack push(newValue) { this.stack.push(newValue) this.top += 1 } // Returns and removes the last element of the Stack pop() { if (this.top !== 0) { this.top -= 1 return this.stack.pop() } throw new Error('Stack Underflow') } // Returns the number of elements in the Stack get length() { return this.top } // Returns true if stack is empty, false otherwise get isEmpty() { return this.top === 0 } // Returns the last element without removing it get last() { if (this.top !== 0) { return this.stack[this.stack.length - 1] } return null } // Checks if an object is the instance os the Stack class static isStack(el) { return el instanceof Stack } } export { Stack } |
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