DarrenSem

// truncate.js (string, max) => "Ellipses after 1st half of ...then the second half of it." [2000 = default for max if omitted]

// 101 chars:
// T=(a,b=2e3)=>null==a?"":(a=a+"").length>(b=Math.max(b,5))?a.slice(0,b/2-1)+"..."+a.slice(-b/2+1.5):a;
var truncate = (string, max = 2000) => (
		string == null ? ""
		: ( string = String(string) ).length > ( max = Math.max(max, 5) )
		? (
			string.slice(0, max / 2 - 1) + "..." + string.slice(-max / 2 + 1.5)
		)

DarrenSem

// negativeZero.js - tiny JavaScript function to differentiate -0 from +0 (can process any type other than Symbol or BigInt)

// 15 chars:	N=a=>1/0==1/-a;
var negativeZero = v => Infinity === 1 / -v;	// => v === 0 && Number.NEGATIVE_INFINITY === 1 / v;



var isWeb = Date.now;	// JScript is missing this method

var values = [

DarrenSem

// REPLACED BY: Array.range.js => new Array( length, optionalEachFunction, optionalMapFunction )
// https://gist.github.com/DarrenSem/bc0403bcdad09912eb298e6d3b4824fe



// Array.build.js -- sugar for functional equivalent of new Array( length, functionUsingIndex ) aka fillArray(L, F) -- returns Array(length).fill(0).map( (_, i) => callbackFn(i) )

Array.build ||= (length, callbackFn) => (
	Array(length|0)
	.fill(0)

DarrenSem

// UMD-javascript-module-template.js
// Universal Module Definition (UMD) template for JavaScript modules
(function(root, factory) {
  // var req1 = foo, req2 = bar; // or even exports
  if(typeof exports === "object" && typeof module !== "undefined") {
    module.exports = factory(req1, req2);
  } else if(typeof define === "function" && define.amd) {
    define([req1, req2], factory)
  } else {
    root["MOD_NAME"] = factory(req1, req2);

DarrenSem

process.js-for-HackerRank

#nodejs #polyfill #browser #hackerrank #node-js #client-side #hackerrank-solutions #hackerrank-javascript #hackerrank-30dayschallange #hackerrank-challenges

https://github.com/DarrenSem/process.js-for-HackerRank (might have more recent updates/improvements)

https://darrensem.github.io/process.js-for-HackerRank/

Minimal polyfill (324 characters minified) for client-side JS to add missing NodeJS functions for completing HackerRank.com challenges -- process.stdin/stdout/env.OUTPUT_PATH and require("fs").createWriteStream

(So I can complete HackerRank.com challenges on my cell using my custom REPL bookmarklet.)

DarrenSem

// hostnameRoot.js -- returns URL/location.hostname with certain prefixes removed: m. mob. mobi. mobile. www. www[0-9]. ww[0-9].

const hostnameRoot = hostname => String(hostname ?? "")
.toLowerCase()
.replace(
  /^(m(ob(i(le)?)?)?|ww(w?\d|w))\.(.+?\..+)/,
  "$6"
);

console.log([

DarrenSem

// ytSubs.js (SEE DISCLAIMER) - via @DarrenSem https://gist.github.com/DarrenSem (22Mar2024)

// YouTube subtitles - English (auto-generated) CC (closed captions)
// Usage: node ytSubs.js videoIdOrUrl
// or Web browser BOOKMARKLET (contents open in a new window)


// ES6 bookmarklet = 4045 chars
javascript:void function(){"use strict";var a=String.fromCharCode;const b="",c=async a=>{try{if(globalThis.fetch){const b=await fetch(a),c=await b.text();return c}return new Promise((b,c)=>{const d=require(/^https/.test(a)?"https":"http").get(a,d=>{if(200>d.statusCode||299<d.statusCode)return c(Error(`${d.statusCode} ${d.statusMessage} ${a}`));const e=[];d.on("data",a=>e.push(a)),d.on("end",()=>b(e.join("")))});d.on("error",a=>c(a))})}catch(a){throw a}},d=a=>{try{a=(a||"")+"";const b=a.match(/"captionTracks":.*"isTranslatable"\:.*?}]/),c=JSON.parse(`{${(b||[""])[0]}}`).captionTracks||[],d=c.map(a=>{const b=a.name;return[g(b.simpleText||b.runs&&b.runs[0].text),a.baseUrl+"&fmt=json3"]});return d}catch(a){}},e=(a,b,c,d)=

DarrenSem

// MongoDB - function getDocumentArray( fnEachDocument, ...documents ) - returns cloned Array of passed documents (after running function on each)

// Purpose: returns cloned Array of passed documents (after running function on each)
// Usage: const docArray = getDocumentArray( fnEachDocument, ...documents ); await coll.insertMany(docArray);
// see the docs for https://www.mongodb.com/docs/manual/reference/method/db.collection.insertMany
// esp. "_id Field" https://www.mongodb.com/docs/manual/reference/method/db.collection.insertMany/#_id-field
// ^ because DURING THE .insert[Many|One]() call, "_id" field is ADDED to the original document! (if missing)

const getDocumentArray = ( fnEachDocument, ...documents ) => (
  fnEachDocument ||= ( document => document ),

DarrenSem

// FizzBuzz expanded - wordmod.js - because why not

// https://gist.github.com/DarrenSem/3a63b31542487bb1fd38e08976d8d215

let wordmod = ( limit = 100, words = { 3: "Fizz", 5: "Buzz" }, sep = "\n" ) => {
  let results = [];

  for (let i = 1; i <= limit; i ++) {
    let result = "";
    for ( let [divisor, word] of Object.entries(words) ) {

DarrenSem

// range(arraySize, optionalMapFunction, optionalEachFunction).js

// https://gist.github.com/DarrenSem/bc0403bcdad09912eb298e6d3b4824fe

const range = ( arraySize, fnMapIndex, fnEachIndexFirst, _indexes ) => (
  _indexes = Array.from( Array(arraySize | 0).keys() ), // because [...Array(arraySize | 0).keys()] triggers TypeScript/VSC error: Type 'IterableIterator' is not an array type or a string type.
  fnEachIndexFirst && _indexes.forEach( index => fnEachIndexFirst(index) ),
  fnMapIndex && ( _indexes = _indexes.map( index => fnMapIndex(index) ) ),
  _indexes
);