baseFind.js

/**
 * The base implementation of `_.find`, `_.findLast`, `_.findKey`, and `_.findLastKey`,
 * without support for callback shorthands and `this` binding, which iterates
 * over `collection` using the provided `eachFunc`.
 *
 * @private
 * @param {Array|Object|string} collection The collection to search.
 * @param {Function} predicate The function invoked per iteration.
 * @param {Function} eachFunc The function to iterate over `collection`.
 * @param {boolean} [retKey] Specify returning the key of the found element
 *  instead of the element itself.
 * @returns {*} Returns the found element or its key, else `undefined`.
 */
function baseFind(collection, predicate, eachFunc, retKey) {
  var result;
  eachFunc(collection, function(value, key, collection) {
    if (predicate(value, key, collection)) {
      result = retKey ? key : value;
      return false;
    }
  });
  return result;
}

module.exports = baseFind;