Class ValueTracker<T>Abstract

An object to keep track of an item with a certain numeric value based on the given predicate.

Items with a non-finite numeric value (e.g. NEGATIVE_INFINITY,POSITIVE_INFINITY, NaN, null, undefined), determined by the given getValue function, are ignored.

See

• MinimumTracker
• MaximumTracker
• minBy
• maxBy

Example

export class MinimumTracker<T> extends ValueTracker<T> {
  constructor(getValue: (item: T) => number) {
    super(getValue, (current, candidate) => candidate < current);
  }
}

export function minBy<T>(
  iterable: Iterable<T>,
  selector: (item: T) => number
): [item: T, value: number] | [] {
  const min = new MinimumTracker<T>(selector);
  for (const item of iterable) {
    min.consider(item);
  }
  return min.result;
}