concat

includes

reduce

let

const

var

do...while

join

indexOf

shift

pop

push

sort

reverse

length

while

for...of

for...in

for

class

return

function

async function

delete

throw

typeof

continue

parseInt()

parseFloat()

isNaN()

undefined

NaN

Infinity

instanceof

Logical NOT (!)

break

isFinite()

forEach

length

startsWith

endsWith

includes

charAt

substring

localeCompare

concat

trim

try...catch

toUpperCase

toLowerCase

switch

if…else

filter