Bump to v4.0.0.

subtract.js

@@ -0,0 +1,26 @@
+/**
+ * Subtract two numbers.
+ *
+ * @static
+ * @memberOf _
+ * @category Math
+ * @param {number} minuend The first number in a subtraction.
+ * @param {number} subtrahend The second number in a subtraction.
+ * @returns {number} Returns the difference.
+ * @example
+ *
+ * _.subtract(6, 4);
+ * // => 2
+ */
+function subtract(minuend, subtrahend) {
+  var result;
+  if (minuend !== undefined) {
+    result = minuend;
+  }
+  if (subtrahend !== undefined) {
+    result = result === undefined ? subtrahend : (result - subtrahend);
+  }
+  return result;
+}
+
+export default subtract;