Categories
Mastering Development

Cell Component not re-rendering on Board in React

Edit I was able to start getting the cells to rerender, but only after adding setCellsSelected on line 106. Not sure why this is working now, react is confusing. Summary Currently I am trying to create a visualization of depth first search in React. The search itself is working but the cell components are not […]

Categories
Mastering Development

Combining two lists in prolog

How would you combine two lists? This is what I tried but it doesn’t give me the result I want, Y = [1,2,3]. Z = [3,4,5]. X = [Y,Z]. This just gives a bigger list with a divided Head and Tail. I want my output to look like this: X = [1,2,3,4,5].

Categories
Mastering Development

Combining two lists in prolog

How would you combine two lists? This is what I tried but it doesn’t give me the result I want, Y = [1,2,3]. Z = [3,4,5]. X = [Y,Z]. This just gives a bigger list with a divided Head and Tail. I want my output to look like this: X = [1,2,3,4,5].

Categories
Mastering Development

Combining two lists in prolog

How would you combine two lists? This is what I tried but it doesn’t give me the result I want, Y = [1,2,3]. Z = [3,4,5]. X = [Y,Z]. This just gives a bigger list with a divided Head and Tail. I want my output to look like this: X = [1,2,3,4,5].

Categories
Mastering Development

Deep merging two Immutable maps while ignoring nested arrays

const map1 = Immutable.Map({ a: { x: 1, z: 1, y: 1, values: 1, 2, 3] } }); const map2 = Immutable.Map({ a: { x: 2, values: [4, 5, 6] } }); const map3 = map1.mergeDeep(map2) // Output I want is: // { a: { x: 2, z: 1, y: 1 values: [4, 5, 6] […]

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Mastering Development

Check if a set of objects intersect another set of objects

I have an object(LineA) that is composed of 4 children and sub-children. They are Meshes(MeshLineMaterial) and ArrowHelpers. Then I have another set of objects(Other Lines) of the same kind. Sample object: castShadow: false
 children: Array(2) 0: ja {uuid: "B883597B-392D-41EB-A306-33A2F065A5B1", name: "PathA", type: "Mesh", parent: Hc, children: Array(0), …}
1: tb {uuid: "8B507A56-437C-47C5-9A0A-43DE9D8DE0D4", name: "", type: "Object3D", parent: Hc, children: Array(2), …} 
length: 2
 __proto__: Array(0)
 
frustumCulled: true
 layers: Pf {mask: 1}
 matrix: U {elements: Array(16)} 
matrixAutoUpdate: true
 matrixWorld: U {elements: Array(16)} 
matrixWorldNeedsUpdate: false
 nObjType: "Path" 
name: "Path" 
parent: wd {uuid: "20293B1F-868F-4A06-9A24-AF14738955A8", name: "", type: "Scene", parent: null, children: Array(121), …} 
position: n {x: 0, y: 0, z: 0}
quaternion: ua {_x: 0, _y: 0, _z: 0, _w: 1,  _onChangeCallback: ƒ}
 receiveShadow: false
 renderOrder: 0
rotation: Qb {_x: 0, _y: 0, _z: 0,  _order: "XYZ",  _onChangeCallback: ƒ}
 scale: n {x: 1, y: 1, z: 1}
 selectable: true
 type: "Group"
 up: n {x: 0, y: 1, z: 0} […]

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Mastering Development

Detecting when a specific block breaks [Spigot Plugin]

I am trying to make a Spigot Plugin that lets you use a command such as /copper where you put in coordinates to the block and it summons armor stands to make it look like the block, that’s how far I have gotten: public class OreCommands implements CommandExecutor { @Override public boolean onCommand(CommandSender sender, Command […]

Categories
Game Creation Mastering Development

A* algorithm: need help fixing path that come in contact with obstacle

I am using A* as a pathfinding technique for my AI; it works fine until it gets close to an obstacle (in my case rocks). Right now it just continues the loop if it finds a neighbor thats a rock. It should not actually do this. It should check it. Allowed Moves: FORWARD,LEFT,RIGHT (LEFT & […]

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Mastering Development

Shiny eventReactive requiring two invalidations

There are many examples of Shiny apps with eventReactive with multiple inputs that responds when either of the inputs are invalidated. However, I’m trying to create an app with an eventReactive that runs when the app is only started, and only when both the Val1 textInput is updated and the actionButton is pressed. Below is […]

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Mastering Development

Could someone explain how the set.default and count[character] = count[character] + 1 works?

So I’m working on some code in a course and I can’t understand how the "count.setdefault" and "count[character] =" works. This code outputs how many times each letter has occurred in the messages string. I also don’t understand how the message variable appears inside of an empty list "the count list". I know this is […]