Bump to v4.0.0.

toLength.js

@@ -0,0 +1,36 @@
+var baseClamp = require('./internal/baseClamp'),
+    toInteger = require('./toInteger');
+
+/** Used as references for the maximum length and index of an array. */
+var MAX_ARRAY_LENGTH = 4294967295;
+
+/**
+ * Converts `value` to an integer suitable for use as the length of an
+ * array-like object.
+ *
+ * **Note:** This method is based on [`ToLength`](http://ecma-international.org/ecma-262/6.0/#sec-tolength).
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to convert.
+ * @return {number} Returns the converted integer.
+ * @example
+ *
+ * _.toLength(3);
+ * // => 3
+ *
+ * _.toLength(Number.MIN_VALUE);
+ * // => 0
+ *
+ * _.toLength(Infinity);
+ * // => 4294967295
+ *
+ * _.toLength('3');
+ * // => 3
+ */
+function toLength(value) {
+  return value ? baseClamp(toInteger(value), 0, MAX_ARRAY_LENGTH) : 0;
+}
+
+module.exports = toLength;