JavaScript Why console.log((!+[]+[]+![]).length) gives 9? [duplicate] console log length of array,console.log length,console.log

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Answer:1

First we have to understand !+[]+[]+![]:

!+[] = !0 = true   
true+[] = "true"
![] = false
"true"+false = "truefalse"

so length of !+[]+[]+![] is length of "truefalse" so it's 9

Answer:2

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