typescript 如何从Typescript中的字符串索引数组中删除项目
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How to remove item from string index array in Typescript
提问by bb2
I have:
我有：
interface IMap {
[name: string]: string;
}
var map: IMap = {};
map["S"] = "s";
map["C"] = "c";
map["D"] = "d";
How can I fully remove item map["S"]? I don't want to end up with a null object so using delete map["S"] wouldn't work.
如何完全删除项目映射 ["S"]？我不想得到一个空对象，所以使用 delete map["S"] 是行不通的。
回答by basarat
How can I fully remove item map["S"]? I don't want to end up with a null object so using delete map["S"]
如何完全删除项目映射 ["S"]？我不想最终得到一个空对象，所以使用 delete map["S"]
deletedoes clear it completely:
delete完全清除它：
interface IMap {
[name: string]: string;
}
var map: IMap = {};
map["S"] = "s";
map["C"] = "c";
map["D"] = "d";
delete map["S"];
console.log(map);
console.log(map["S"],map["non-existent"]); // undefined,undefined
console.log(Object.keys(map)); // ["C","D"]
