add new problem Thinkful-Logic

Author: anasmak04

README.md

@@ -31,4 +31,5 @@
 | Problem - 27 | [Binary Search implementation with JS](https://github.com/MehedilslamRipon/Problem-solving-with-JavaScript/blob/master/problem-27.js) |
 | Problem - 28 | [Make a unique random string generator - uuid alternative lite](https://github.com/MehedilslamRipon/Problem-solving-with-JavaScript/blob/master/problem-28.js) |
 | Problem - 29 | [Given a set of numbers, return the additive inverse of each. Each positive becomes negatives, and the negatives become positives](https://github.com/anasmak04/Problem-solving-with-JavaScript/blob/master/problem-29.js) |
-<!-- | Problem - 30 | | -->
+| Problem - 31 | [Thinkful-Logic](https://github.com/anasmak04/Problem-solving-with-JavaScript/blob/master/problem-30.js) |
+<!-- | Problem - 31 | | -->

problem-30.js

@@ -0,0 +1,10 @@
+// You're writing code to control your town's traffic lights. You need a function to handle each change from green, to yellow, to red, and then to green again.
+
+// Complete the function that takes a string as an argument representing the current state of the light and returns a string representing the state the light should change to.
+
+// For example, when the input is green, output should be yellow
+
+
+function updateLight(current) {
+ return current == 'green' ? 'yellow' : current == 'yellow' ? 'red' : 'green'
+}