($=+!+[]/[]+[],$[_=-~-~-~-~-~-~-[]]+$[--_]+$[--_]+$[_+_-!+[]])

most cursed engine detection: isV8=![...'.'.repeat(1e5)].find(_=>(v=Math.random()*(1/Number.EPSILON),v!=Math.floor(v)))

factorial=l=>eval([...Array(l)].map((_,i)=>l-i).join`*`)

fliptext=s=>[...s].reverse().map(s=>l[l.indexOf(s)^1]||s).join``;l="Ɩ1ᄅ2Ɛ3ㄣ4ϛ5ㄥ769∀ABꓭƆCDꓷƎEℲFפGſJʞK˥LWMԀPQῸRꓤ┴T∩UΛVMW⅄Yaɐbqcɔdpeǝfɟgƃhɥiᴉjɾkʞlןmɯnupdqbrɹtʇunvʌwʍyʎ¿?¡!',.˙"

eval(d="`eval(d=`+(e=''.link()[8])+d+e+`)`")

(q=u=>(i=`(q=${q},q())`,i+' // '+[...i].reverse().join``),q()) // ))(q,)``nioj.)(esrever.]i...[+' // '+i,`))(q,}q{$=q(`=i(>=u=q( palindromic quine

Array.from({ length: !``|2 }, (o, ø) => +([]+((-~[]<<-~-~-~-~-~-~-~[])-+-~-~-~-~-~[]))[ø])

[...Array(30)].map((_,i) => '‾|_'[(Math.sin(++i)*2|0)+1]).join``.link``.slice(0xB)

[...0xAAAAAAAAAAAA.toString(2)].map(n=>(String.fromCharCode(0x27cb+n*2))).join``.link``.slice(0xA + !!'snake')

fizzbuzz=n=>['FizzBuzz',,,'Fizz',,'Buzz'][n**4%15/2]||n

[,,,...$]=[]+(_=>toString);$[([]+{})[_=-~-~-~[]]+$[__=+!![]]+$[_=_+_-__]+$[__+_]]([]+[])

1234..toString(36)

'cgzh6phq7?68hqlcqv5?6ansibbi5?6aosfyy69?6anssf4l5?6a9isbb0h?7utpul5dt?7pit6ukqp?68hqlcqv5?cgzh6phq7'.split`?`.map(d=>[...parseInt(d,36).toString(2)].map(d=>' #'[d]).join``).join`\n`

(x=>(a=x+unescape('%60'))+a)`(x=>(a=x+unescape('%60'))+a)`

'1, or two, three, or four'.split(/(?:, ?)?\s+or\s+|, ?|or ?/)

String.fromCharCode(...[...Array(128)].map((_,i)=>9605+Math.sin(i/(5-(i/32)))*4|0))