DarrenSem

// REPL.js AKA eval.js -- REPL.js AKA eval.js -- Bookmarklet to append to current webpage a text input field + global-scope [EVAL] button - ALSO evaluates console.[log|error|warn|info|assert]

// javascript:void function(){var a=document,b=(b,c)=>Object.assign(a.createElement(b||"button"),c),c=b("pre"),d=b("div",{contentEditable:!0}),e="innerText",f=b(0,{[e]:"EVAL",onclick:(a,b,c,f=new Date().toLocaleTimeString(),g=location,h,i=/\bconsole\s*\.(log|error|warn|info|assert)\s*\(([^)])/g)=>{try{a=d[e],b=(g._=[],(i.test(a)?"let _=location,_log=(...a)=>{_._.push(a.join(\" \"));"+"\nlet m=(String(a[0]).match(/^<([aefgilnorw_ts]{3,6})>$/)||[])[1]||\"log\";console[m](...(a.slice(m==\"assert\"?1:0)))"+"\n};\n":"")+a).replace(i,`_log('<$1>', $2`),c=(0,eval)(b)+"",g._&&(c=g._.concat([c]).join("\n"))}catch(a){c=a.stack||a.message,c+="\n"+b}d[e]+=/[\n\r]/.test(c)?`\n\n/\* ${f}:\n${c.replace(/\*\//g,"* /")}\n*\/`:`\n// ${f}: ${c}`,d.focus()}});[f,c].forEach(({style:a},b)=>{a.border=b?"solid":"ridge",a.background=b?"#0aa":"#

DarrenSem

// camelToKebab.js (string, toSnakeNotKebab) -- also will recognize automatically when to call REVERSE function



// 207 characters	var camelToKebab=(a,b,c=/[_-]/.test(a))=>a&&a.link?a.replace(/\s/g,"").replace(/[A-Z_-]/g,c?" ":a=>" "+a).replace(/^\s+|\s+$/g,"").toLowerCase().replace(/ ([a-z]*)/g,c?a=>a.charAt(1).toUpperCase()+a.slice(2):b?"_$1":"-$1"):a

// /*	// (to run JSCRIPT-compatible version, comment out arrow function) 
var camelToKebab = (string, toSnakeNotKebab,
	_reverse = /[_-]/.test(string)
) => (

DarrenSem

// type.js AKA clazz constructor ctor.js (more granular than built-in typeof which returns "object" for most things)

// T=a=>({}).toString.call(a).slice(8,-1);	// use case: if you have no need for JScript support
// T=function(a){return(null==a?a+"":{}.toString.call(a).slice(8,-1))}; 	// use case: non-JScript returns the same as JScript -- "null"/"undefined" instead of "Null"/"Undefined"
// T=function(a){return(/*@cc_on @if(@_jscript) null==a?a+"": @end@*/{}.toString.call(a).slice(8,-1))};	// use case: only JScript returns "null"/"undefined", while non-JScript returns "Null"/"Undefined"

var type = function(v) {
	return (
		/*@cc_on @if(@_jscript) v == null ? String(v) : @end@*/
		{}.toString.call(v).slice(8,-1)	// smaller than Object.prototype.toString.call(v).slice(8,-1)

DarrenSem

// stringify.js (handles virtually all types unlike the normal JSON.stringify -- intended for inspecting/displaying object values, NOT for serializing/exporting)

/*
this function's result is far more flexible, human-friendly, and USEFUL than JSON.stringify, because...

( Infinity ) => 'Infinity' and ( NaN ) => 'NaN' , instead of 'null'
( undefined ) => 'undefined' and ( Date ) => 'function Date() { [native code] }' , instead of undefined
( new TypeError("xyz") ) => 'TypeError: xyz' , instead of '{}'
( /z/img ) => '/z/gim' , instead of '{}' ( JSCRIPT => '/z/igm' )
( [ , ] ) => '[undefined]' , instead of '[null]'

DarrenSem

// JSONstringify.js - from-scratch implementation of JSON.stringify as a coding exercise ( and for JScript WSH using CSCRIPT.EXE /nologo MyJScript.js )

// 525 chars	_=function(a){var b,c=null,d=typeof a,e=/^(undefined|function|bigint|symbol)$/i,f=0,g=[],h=function(a,b){return a==b?a+"":{}.toString.call(a).slice(8,-1)};if(!e.test(d)){if("string"===d)return"\""+a+"\"";if(!a||"object"!==d||"Number"===h(a))return("Number"===h(a)?isFinite(a)?+a:c:a)+"";if("Date"===h(a)&&!isNaN(a))return _(a.toISOString());if("Array"===h(a)){for(b=a.length;f<b;f++)g.push(_(e.test(h(a[f]))?c:a[f]));return"["+g+"]"}for(f in a)a.hasOwnProperty(f)&&!e.test(h(a[f]))&&g.push(_(f)+":"+_(a[f]));return"{"+g+"}"}}
var JSONstringify = function(obj) {
	var NULL = null;
	var type = typeof obj;
	var skip = /^(undefined|function|bigint|symbol)$/i
	var L;
	var key = 0;
	var elements = [];

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

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

// contentsInNewWindow.js - F5-REFRESHABLE! - with TITLE! - (contents = '' or [], title, type = 'octet-stream', array-joining-delim = '\n\n')

// const contentsInNewWindow=(c=[],T,t="octet-stream",d="\n\n")=>{const w=open(URL.createObjectURL(new Blob([[c].flat(1/0).join(d)],{type:"text"===t?t+"/plain;charset=utf-8":t})),"_blank");return w&&!w.closed&&(w.onload=()=>w.document.title=T),w};
const contentsInNewWindow = (contents = [], title, type = ["text", "octet-stream"][1], delim = "\n\n") => {
	const win = open(
		URL.createObjectURL(
			new Blob([
				[contents].flat(1/0).join(delim)
			], {
				// auto-UTF8 if type === 'text', to easily ensure visible emojis etc.