TypeScript Map initialization with string array entries

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[]>'.

The conversation continues 2

Follow the reasoning

jo_ren29 Sept Permalink
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"]]
      ]);
```

bram3310 hours ago

  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 case

Alternatively initialize it directly

  entryTable: Map<string, string[]> = new Map([['m', ['n', 'p']]]);

TypeScript Map initialization with string array entries

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