All files / array/operator findIndexBack.ts

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import {Predicate} from 'fnxt/fnxt-types';
 
export const findIndexBack = <T>(fn: Predicate<T>) => (array: T[]): number => {
  if (array.length === 0) {
    throw Error('Array empty');
  }
  for (let i = array.length-1; i >= 0; i--) {
    const element = array[i];
    if (fn(element)) {
      return i;
    }
  }
  throw Error('Not found')
 
};