--- /dev/null
+var baseCallback = require('./baseCallback'),
+ baseFindIndex = require('./baseFindIndex');
+
+/**
+ * Creates a `_.findIndex` or `_.findLastIndex` function.
+ *
+ * @private
+ * @param {boolean} [fromRight] Specify iterating from right to left.
+ * @returns {Function} Returns the new find function.
+ */
+function createFindIndex(fromRight) {
+ return function(array, predicate, thisArg) {
+ if (!(array && array.length)) {
+ return -1;
+ }
+ predicate = baseCallback(predicate, thisArg, 3);
+ return baseFindIndex(array, predicate, fromRight);
+ };
+}
+
+module.exports = createFindIndex;