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unzipWith() function

Nov 19, 2022CodeCatch
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Clone an array

Nov 19, 2022CodeCatch

0 likes • 1 view

// `arr` is an array
const clone = arr => arr.slice(0);
// Or
const clone = arr => [...arr];
// Or
const clone = arr => Array.from(arr);
// Or
const clone = arr => arr.map(x => x);
// Or
const clone = arr => JSON.parse(JSON.stringify(arr));
// Or
const clone = arr => arr.concat([]);

Redux Slice

Mar 11, 2021C S

1 like • 4 views

import { createSlice } from "@reduxjs/toolkit";
const alert = createSlice({
name: "alert",
initialState: {
msg: "",
status: "",
},
reducers: {
set_alert: (state, action) => {
return {
...state,
msg: action.payload.msg,
status: action.payload.status,
};
},
clear_alert: (state, action) => {
return {
...state,
msg: "",
status: "",
};
},
},
});
export default alert.reducer;
const { set_alert, clear_alert } = alert.actions;
export const setAlert = (msg, status) => dispatch => {
dispatch(set_alert({ msg, status }));
setTimeout(() => dispatch(clear_alert()), 4000);
};
export const clearAlert = () => dispatch => {
dispatch(clear_alert());
};

Tree Traversal

Oct 16, 2023C S

0 likes • 8 views

class TreeNode {
constructor(data, depth) {
this.data = data;
this.children = [];
this.depth = depth;
}
}
function buildNaryTree(hosts) {
const nodeMap = {};
// Step 1: Create a map of nodes using fqdn as the key
hosts.forEach((host) => {
nodeMap[host.fqdn] = new TreeNode(host, 0); // Initialize depth to 0
});
// Step 2: Iterate through the array and add each node to its parent's list of children
hosts.forEach((host) => {
if (host.displayParent) {
if (nodeMap[host.displayParent]) {
const parent = nodeMap[host.displayParent];
const node = nodeMap[host.fqdn];
node.depth = parent.depth + 1; // Update the depth
parent.children.push(node);
} else {
console.error(`Parent with fqdn ${host.displayParent} not found for ${host.fqdn}`);
}
}
});
// Find the root nodes (nodes with no parent)
const rootNodes = hosts.filter((host) => !host.displayParent).map((host) => nodeMap[host.fqdn]);
return rootNodes;
}
function treeToObjects(node) {
const result = [];
function inOrder(node) {
if (!node) {
return;
}
// Visit the current node and add it to the result
result.push(node.data);
// Visit children nodes first
node.children.forEach((child) => {
inOrder(child);
});
}
inOrder(node);
return result;
}
// Usage example
const hosts = [
{
fqdn: 'fqdn_1',
display_name: 'Host 1',
},
{
fqdn: 'fqdn_2',
display_name: 'Host 2',
displayParent: 'fqdn_1',
},
{
fqdn: 'fqdn_3',
display_name: 'Host 3'
},
{
fqdn: 'fqdn_4',
display_name: 'Host 4',
displayParent: 'fqdn_3',
},
{
fqdn: 'fqdn_5',
display_name: 'Host 5',
displayParent: 'fqdn_1',
},
];
const tree = buildNaryTree(hosts);
// Function to convert the tree to an array of objects
function convertTreeToArray(nodes) {
const result = [];
nodes.forEach((node) => {
result.push(...treeToObjects(node));
});
return result;
}
// Convert the tree back to an array of objects
const arrayFromTree = convertTreeToArray(tree);
console.log(arrayFromTree);

Canvas File Downloader

Nov 18, 2022AustinLeath

0 likes • 5 views

results =
{
"11345240":"Media Comment-80e47004-1719-493a-af69-a43b2652b41c",
"11345282":"zoom_3_22_21.mp4",
"11345303":"Recording-2.m4a",
"11345348":"February 12%2C 2021.mp4",
"11345826":"Lecture_Rousso_Chapter_06-2.pptx",
"11345933":"Themes_InClassAssigment.pptx",
"11346193":"Agenda – Week of March23.pptx",
"11346318":"MUJS 2370 SP2021 Updated Rhythm Changes Drills Bb - Score.pdf",
"11346319":"MUJS 2370 SP2021 Updated Rhythm Changes Drills C - Score.pdf",
"11346322":"MUJS 2370 SP2021 Updated Rhythm Changes Drills Eb - Score.pdf",
"11346323":"MUJS 2370 Updated Rhythm Changes Drills Bass - Score.pdf",
"11346381":"Anthropology with colored highlighter analysis - Mar 22 2021 - 10-36 AM.pdf",
"11346449":"Anthropology with colored highlighter analysis - Mar 22 2021 - 10-36 AM.pdf",
"11346450":"MUJS 2370 SP2021 Updated Rhythm Changes Drills Bb - Score.pdf",
"11346451":"MUJS 2370 SP2021 Updated Rhythm Changes Drills C - Score.pdf",
"11346453":"MUJS 2370 SP2021 Updated Rhythm Changes Drills Eb - Score.pdf",
"11346454":"MUJS 2370 Updated Rhythm Changes Drills Bass - Score.pdf",
"11346495":"Steinel chromatic ornamentation étude rhythm changes - Aug 23 2020 - 12-19 PM.pdf",
"11346532":"Media Comment-136242b4-7f2c-4d5d-8aa4-091f07e797cf",
"11346581":"2019 Trust Based Relationship Intervention Manual.pdf",
"11346584":"TBRI ppt.pptx",
"11346593":"Trauma informed care.ppt"
}
function NewTab(testing) {
window.open(testing, "_blank");
}
for(test in results) {
var testing = 'https://unt.instructure.com/files/' + test + '/download';
NewTab(testing);
//window.open = 'https://unt.instructure.com/files/' + test + '/download';
}

typewriter-effect in Vanilla JS and React

Jan 25, 2023C S

0 likes • 8 views

// Vanilla JS Solution:
var app = document.getElementById('app');
var typewriter = new Typewriter(app, { loop: true });
typewriter
.typeString("I'm John and I'm a super cool web developer")
.pauseFor(3000)
.deleteChars(13) // "web developer" = 13 characters
.typeString("person to talk with!") // Will display "I'm John and I'm a super cool person to talk with!"
.start();
// React Solution:
import Typewriter from 'typewriter-effect';
<Typewriter
options={{ loop: true }}
onInit={typewriter => {
typewriter
.typeString("I'm John and I'm a super cool web developer")
.pauseFor(3000)
.deleteChars(13) // "web developer" = 13 characters
.typeString("person to talk with!") // Will display "I'm John and I'm a super cool person to talk with!"
.start();
}}
/>

binomial coefficient

Nov 19, 2022CodeCatch

0 likes • 0 views

const binomialCoefficient = (n, k) => {
if (Number.isNaN(n) || Number.isNaN(k)) return NaN;
if (k < 0 || k > n) return 0;
if (k === 0 || k === n) return 1;
if (k === 1 || k === n - 1) return n;
if (n - k < k) k = n - k;
let res = n;
for (let j = 2; j <= k; j++) res *= (n - j + 1) / j;
return Math.round(res);
};
binomialCoefficient(8, 2); // 28