Having recently delved into the world of TypeScript and Angular with a strong background in Java and Kotlin, I encountered a puzzling issue while working on a class.
export interface GeoData {
allregions: Map<string, string>;
}
This class was designed to parse the following JSON data:
{"allregions":{"whatever":"WHT","a region":"ARE","something":"SMT"}
The JSON data was successfully retrieved from a file using HttpClient.get() and upon inspection through debugging, the content appeared as expected. For instance, this code worked:
console.log(data.allregions["whatever"])
It correctly displayed WHT.
However, when attempting to iterate over the 'allregions' map using a forEach loop like this:
data.allregions.forEach((value: string, key: string) => {
console.log(key, value);
});
An error message stating that "
data.allregions.forEach is not a functionsize or entries.length resulted in unexpected output or errors.
This unexpected behavior led me to wonder: what exactly is happening here?