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[クイズ]javascriptと仲良くなるための一歩　第３７話「配列の要素アクセス」

JavaScript

Posted at 2017-08-23

問題

var arr = [0,1,2,3,4,5,6,7,8,9,10,11]
var str = "1"
arr[str]   //=> ?
arr[str+1] //=> ?

答え

文字列でも数値になるようにしてくれる

var arr = [0,1,2,3,4,5,6,7,8,9,10,11]
var str = "1"
arr[str]   //=> 1
arr[str+1] //=> 11

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