--- /dev/null
+/**
+ * The base implementation of `_.findIndex` and `_.findLastIndex` without
+ * support for iteratee shorthands.
+ *
+ * @private
+ * @param {Array} array The array to search.
+ * @param {Function} predicate The function invoked per iteration.
+ * @param {boolean} [fromRight] Specify iterating from right to left.
+ * @returns {number} Returns the index of the matched value, else `-1`.
+ */
+function baseFindIndex(array, predicate, fromRight) {
+ var length = array.length,
+ index = fromRight ? length : -1;
+
+ while ((fromRight ? index-- : ++index < length)) {
+ if (predicate(array[index], index, array)) {
+ return index;
+ }
+ }
+ return -1;
+}
+
+module.exports = baseFindIndex;