operator findIndex.ts

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100% Branches 4/4

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