FWIW: I (@Rondy) am not the author of the content presented here, which is an outline from Edmond Lau's book. I've just copy-pasted it from somewhere and saved as a personal gist, before it got popular on newsnews.ycombinator.com. I don't remember where exactly the original source is from and neither could find the author's name, so I cannot give him/her the proper credits.
| class ListNode { | |
| constructor(value) { | |
| this.value = value; | |
| this.next = null; | |
| } | |
| } | |
| function reverseLinkedList(head, prev = null) { | |
| if (head === null) { | |
| return prev; |
| // Definition for singly-linked list | |
| function ListNode(val) { | |
| this.val = val; | |
| this.next = null; | |
| } | |
| // Function to reverse a singly-linked list | |
| function reverseLinkedList(head) { | |
| let prev = null; | |
| let current = head; |
| /* | |
| This memoize function takes in another function as its argument (func) | |
| and returns a new function that caches the results of func based on its arguments. | |
| The returned function first checks if the arguments have already been cached | |
| by checking if there is a key in the cache object with the same JSON stringified arguments (key). | |
| If there is a cached value, it returns it. If not, it invokes the original function func with the arguments, | |
| caches the result under the key, and returns the result. | |
| */ |
// https://angularfirebase.com/lessons/firestore-security-rules-guide/
// https://medium.com/@jek.bao.choo/my-firestore-security-rules-learning-notes-14316400f160
Scope Rules to Specific Operations Rules can be enforced on various read/write operations that occur in a clientside app. We can scope rules to each of the follow read operations.
allow read - Applies to both lists and documents. allow get - When reading a single document. allow list - When querying a collection.
| # https://stackoverflow.com/questions/69343233/github-action-increment-version-on-push-to-main | |
| name: Version Increment | |
| on: | |
| push: | |
| branches: | |
| - main | |
| jobs: |
| name: Create Release Branch | |
| on: | |
| workflow_dispatch: | |
| inputs: | |
| versionName: | |
| description: 'Name of version (ie 5.5.0)' | |
| required: true | |
| versionCode: | |
| description: 'Version number (50500)' | |
| required: true |
| var groupBy = function(data, key) { // `data` is an array of objects, `key` is the key (or property accessor) to group by | |
| // reduce runs this anonymous function on each element of `data` (the `item` parameter, | |
| // returning the `storage` parameter at the end | |
| return data.reduce(function(storage, item) { | |
| // get the first instance of the key by which we're grouping | |
| var group = item[key]; | |
| // set `storage` for this instance of group to the outer scope (if not empty) or initialize it | |
| storage[group] = storage[group] || []; | |
| Largest 1000 Cities in America | |
| 2013 popuation data - Biggest US Cities By Population | |
| rank,city,state,population,2000-2013 growth | |
| 1,New York,New York,8405837,4.8% | |
| 2,Los Angeles,California,3884307,4.8% | |
| 3,Chicago,Illinois,2718782,-6.1% | |
| 4,Houston,Texas,2195914,11.0% | |
| 5,Philadelphia,Pennsylvania,1553165,2.6% |