Initialize a Map containing arrays in TypeScript

Per Mozilla's Map documentation, you can initialize as follows:

private _gridOptions:Map<string, Array<string>> = 
    new Map([
        ["1", ["test"]],
        ["2", ["test2"]]
    ]);

variableName: Map<string, string[]> = new Map();

To push elements into Map:

variableName.set("a", ["b", "c"]);

To get/retrieve elements from map:

variableName.get(key);// "a" in above case

Or directly use

variableName: Map<string, string[]> = new Map("a", ["b", "c"]);

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