JavaScript Using a Map instance to return an array of distinct objects by property name?

The Error message is a bit misleading. His problem is, that it can not ensure that e[property] is of type string as you've defined the Map.

Make the key in the Map of type any as with so much flexibility you can not determine the type of the value either.

Additionally I'd type the property parameter as keyof E so TS ensures that I can only paste in valid property names for the type.

function distinct<E>(entities:E[], property:keyof E):E[] {
    let map:Map<any, E> = new Map();
    entities.forEach((e:E)=>{
        map.set(e[property], e);
    });
    return Array.from(map.values());
}
Answer:1

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