From 4ca04a2ee593bc7e18dc4e5546ee38a008366cbd Mon Sep 17 00:00:00 2001
From: Matias Kaplan <mkap@stanford.edu>
Date: Wed, 18 May 2022 17:45:06 -0700
Subject: [PATCH] Adding in a Reverse Function

To complement the current set of functions I've added in a reverse sequence function
---
 src/getReverseSequenceString.js      | 16 ++++++++++++++++
 src/getReverseSequenceString.test.js | 11 +++++++++++
 2 files changed, 27 insertions(+)
 create mode 100644 src/getReverseSequenceString.js
 create mode 100644 src/getReverseSequenceString.test.js

diff --git a/src/getReverseSequenceString.js b/src/getReverseSequenceString.js
new file mode 100644
index 0000000..6cca91b
--- /dev/null
+++ b/src/getReverseSequenceString.js
@@ -0,0 +1,16 @@
+const DNAComplementMap = require("./DNAComplementMap");
+// const ac = require('ve-api-check');
+// ac.throw([ac.string,ac.bool],arguments);
+module.exports = function getReverseSequenceString(sequence) {
+  // ac.throw([ac.string],arguments);
+  let reverseSequenceString = "";
+  for (let i = sequence.length - 1; i >= 0; i--) {
+    let revChar = sequence[i];
+    if (!revChar) {
+      revChar = sequence[i];
+      // throw new Error('trying to get the reverse of an invalid base');
+    }
+    reverseSequenceString += revChar;
+  }
+  return reverseSequenceString;
+};
diff --git a/src/getReverseSequenceString.test.js b/src/getReverseSequenceString.test.js
new file mode 100644
index 0000000..50b3359
--- /dev/null
+++ b/src/getReverseSequenceString.test.js
@@ -0,0 +1,11 @@
+const chai = require("chai");
+chai.should();
+const chaiSubset = require("chai-subset");
+chai.use(chaiSubset);
+const getReverseSequenceString = require("./getReverseSequenceString");
+describe("getReverseSequenceAndAnnotations", function() {
+  it("handles a range option correctly and reverse complements a subset of the sequence across the origin ", function() {
+    const newSeq = getReverseSequenceString("uuuucccttt");
+    newSeq.should.eq("tttcccuuuu");
+  });
+});