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| function memoize(callback) { | |
| const cache = new Map(); | |
| return (...args) => { | |
| const strArgs = String(args) | |
| if (cache.has(strArgs)) { | |
| return String(cache.get(strArgs));; | |
| } |
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| class PaginationHelper { | |
| constructor(collection, itemsPerPage) { | |
| this.collection = collection; | |
| this.itemsPerPage = itemsPerPage; | |
| } | |
| itemCount() { | |
| return this.collection.length; | |
| } | |
| pageCount() { | |
| return Math.ceil(this.itemCount() / this.itemsPerPage); |