我在创建一个 Map，其中每个条目都保存字符串数组。怎样在一条语句中同时声明类型并完成初始化？
我（天真地）这样试了一下。
private _rowEntries:Map<string, Array<string>> = {"3": ["sampleA"]};结果是下面这个错误。
Module build failed: Error: /Users/arden/Work/controlpanel/src/app/core/rows.service.ts (12,7): Type '{ "3": string[]; }' is not assignable to type 'Map<string, string[]>'.I'm creating a Map whose entries each hold an array of strings. How can I declare its type and initialize it together in one statement?
My (naive) attempt was:
private _rowEntries:Map<string, Array<string>> = {"3": ["sampleA"]};which produces:
Module build failed: Error: /Users/arden/Work/controlpanel/src/app/core/rows.service.ts (12,7): Type '{ "3": string[]; }' is not assignable to type 'Map<string, string[]>'.根据 Mozilla 的 Map 文档 (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map#Relation_with_Array_objects)，可以这样初始化。
private _rowEntries:Map<string, Array<string>> =
new Map([
["3", ["sampleA"]],
["4", ["sampleB"]]
]);According to the Mozilla documentation for Map (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map#Relation_with_Array_objects), initialization can look like this:
private _rowEntries:Map<string, Array<string>> =
new Map([
["3", ["sampleA"]],
["4", ["sampleB"]]
]); entryTable: Map<string, string[]> = new Map();向 Map 插入条目时这样写。
entryTable.set("m", ["n", "p"]);从 Map 读取条目时这样写。
entryTable.get(entryKey);// "m" in above case或者直接初始化
entryTable: Map<string, string[]> = new Map([['m', ['n', 'p']]]); entryTable: Map<string, string[]> = new Map();For inserting entries in a Map:
entryTable.set("m", ["n", "p"]);For reading entries out of a Map:
entryTable.get(entryKey);// "m" in above caseAlternatively initialize it directly
entryTable: Map<string, string[]> = new Map([['m', ['n', 'p']]]);为什么 Typescript 接受我的函数定义，虽然它与接口签名不同，但当我实际调用同一个函数时却报告问题。
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