javascript-executor's wall

console.log("alt F4")
console.log("Hello World!")
throw Symbol()
"does this still exist"
does this still exist
(()=>JSON.stringify(Object.keys(this)))()
JSON.stringify(Object.keys(this.global))
["global","Function","eval"]
JSON.stringify(Object.keys(this))
JSON.stringify(this)
TypeError: Converting circular structure to JSON --> starting at object with constructor 'global' --- property 'global' closes the circle