Friday, May 31, 2019
javascript - Why console.log((!+[]+[]+![]).length) gives 9?
Answer
Answer
By what logic js works (!+[]+[]+![]).length returns 9? How is that possible?
As I know js has dynamic types cast but very hard to understand whats going on here
console.log((!+[]+[]+![]).length);Answer
First we have to understand !+[]+[]+![]:
!+[] = !0 = true
true+[] = "true"
![] = false
"true"+false = "truefalse"
so length of !+[]+[]+![] is length of "truefalse" so it's 9
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