Why does ++[[]][+[]]+[+[]] return the string "10"?

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[paulownia]

+[] === 0 と [1] === "1" がポイントか…

[mattn]

"10"って文字列じゃない？

[tmatsuu]

うほっ、なんやこれ。ほんまに10や。

[ilysf]

Javascriptの基本的な性質を積み重ねると答えが出る。ある意味良問。