Map function for the Map Class

MapMap.tsx

// generic map function for the Map class for typescript
function MapMap<TKey, TValue, TReturn>(map: Map<TKey, TValue>, mapper: (key: TKey, value: TValue) => TReturn): TReturn[] {
    var t = [] as TReturn[];
    map.forEach((val, key) => t.push(mapper(key, val)));
    return t;
}


// USAGE EXAMPLE
interface SimpleSelectProps extends BaseFieldProps<string> {
    options: Map<string, string>;
}

export class SimpleSelect extends React.Component<SimpleSelectProps> {
    render() {
        var { options } = this.props;
        return (
            <select className="form-control" value={this.props.value} onChange={this.onchange}>
                {MapMap(options, (key, value) => <option value="key">{value}</option>)}
            </select>
        );
    }

    onchange = (ev: React.ChangeEvent<HTMLSelectElement>) => {
        this.props.onChange(ev.target.value);
    }
}