WIP: added flip-bool.js

src/flip-bool.js

@@ -0,0 +1,31 @@
+/* eslint prefer-spread:0 */
+export default flipBool
+
+/**
+ * Original Source:
+ * https://github.com/eggheadio-github/stack-overflow-copy-paste/issues/251
+
+ * This method will take a boolean value and reverse its value.
+ *
+ * @param {bool} boolArg - the bool that will be mutated
+ * @return {bool} boolArgv - the bool that was mutated
+ *
+ * Takes a bool value and checks to see if it's data type is boolean. If true,
+ * it will reverse the value of the passed boolean and return that value. If
+ * false, it returns a string with the value 'boolean expected'.
+ */
+
+function flipBool(boolArg) {
+
+  if (typeof (boolArg) === 'boolean') {
+
+    if (boolArg === true) {
+      boolArg = false
+    } else {
+      boolArg = true
+    }
+    return boolArg
+  } else {
+    return 'boolean expected'
+  }
+}