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JavaScriptのオブジェクトのkeyにnullが使える話

JavaScript

Posted at 2013-12-10

var hash = {};
hash.null = "123";       // プロパティ名として有効
console.log(hash.null);  // "123"
console.log(hash[null]); // "123"

var nullValue = null;         //変数の値がnullでもOK
console.log(nullValue);       //null
console.log(hash[nullValue]); //"123"

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