Below is an object that I am working with:
export namespace Data {
export type AsObject = {
a: string,
b: string,
c: string,
d: number,
}
}
I am looking to identify the most frequent occurrence of the string Data.AsObject.a within Data.AsObject[]. If anyone has a TypeScript code snippet that can accomplish this, I would greatly appreciate it. Thank you!
In the scenario where the array is empty or there is a tie for the greatest occurrence, an error will be triggered as I have implemented conditions to handle these cases:
If you wish to alter this behavior, adjustments will need to be made accordingly.
This implementation also allows you to find the highest occurrence of any other property: simply change the specified key as the second argument.
namespace Data {
export type AsObject = {
a: string;
b: string;
c: string;
d: number;
};
}
// If there's a tie, only one is returned
function greatestOccurrence <K extends keyof Data.AsObject>(
arr: Data.AsObject[],
key: K,
): Data.AsObject[K] {
type T = Data.AsObject[K];
const map = new Map<T, number>();
for (const o of arr) {
const item = o[key];
map.set(item, (map.get(item) ?? 0) + 1);
}
const result = [...map].sort(([, a], [, b]) => b - a)[0]?.[0];
if (typeof result === 'undefined') throw new Error('Array is empty');
return result;
}
///// Use like this:
// Example with incomplete props:
const items = [
{a: 'hello'},
{a: 'hello'},
{a: 'hola'},
{a: 'willkommen'},
{a: 'bonjour'},
{a: 'hola'},
{a: 'hola'},
] as Data.AsObject[];
const result = greatestOccurrence(items, 'a');
console.log(result); // "hola"
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