Bump to v4.0.0.

internal/baseIteratee.js

@@ -0,0 +1,30 @@
+var baseMatches = require('./baseMatches'),
+    baseMatchesProperty = require('./baseMatchesProperty'),
+    identity = require('../identity'),
+    isArray = require('../isArray'),
+    property = require('../property');
+
+/**
+ * The base implementation of `_.iteratee`.
+ *
+ * @private
+ * @param {*} [value=_.identity] The value to convert to an iteratee.
+ * @returns {Function} Returns the iteratee.
+ */
+function baseIteratee(value) {
+  var type = typeof value;
+  if (type == 'function') {
+    return value;
+  }
+  if (value == null) {
+    return identity;
+  }
+  if (type == 'object') {
+    return isArray(value)
+      ? baseMatchesProperty(value[0], value[1])
+      : baseMatches(value);
+  }
+  return property(value);
+}
+
+module.exports = baseIteratee;