// 配列の初期化
var arry = {};
// 配列にプロパティを追加
arry["prop1"] = { "name": "val1", "age": 30 };
arry["prop2"] = { "name": "val3", "age": 25 };
// プロパティの削除
delete arry.prop1;
// もしくは
delete arry['prop1'];
MDN - delete
https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Operators/delete
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