From 379f4e105048f403472e8b41db1dbf2cf0c452a4 Mon Sep 17 00:00:00 2001
From: divlo <contact@divlo.fr>
Date: Sun, 15 Nov 2020 11:40:06 +0100
Subject: [PATCH] feat(solution): javascript-non-repeating

---
 .../javascript-non-repeating/README.md        |  5 +++
 .../javascript-non-repeating/solution.js      | 37 +++++++++++++++++++
 2 files changed, 42 insertions(+)
 create mode 100644 challenges/first-non-repeating-character/solutions/javascript-non-repeating/README.md
 create mode 100644 challenges/first-non-repeating-character/solutions/javascript-non-repeating/solution.js

diff --git a/challenges/first-non-repeating-character/solutions/javascript-non-repeating/README.md b/challenges/first-non-repeating-character/solutions/javascript-non-repeating/README.md
new file mode 100644
index 0000000..8aa1e7c
--- /dev/null
+++ b/challenges/first-non-repeating-character/solutions/javascript-non-repeating/README.md
@@ -0,0 +1,5 @@
+# javascript-non-repeating - first-non-repeating-character
+
+Programming language : JavaScript
+
+Created by [@Divlo](https://github.com/Divlo) on 15 November 2020.
diff --git a/challenges/first-non-repeating-character/solutions/javascript-non-repeating/solution.js b/challenges/first-non-repeating-character/solutions/javascript-non-repeating/solution.js
new file mode 100644
index 0000000..5695c54
--- /dev/null
+++ b/challenges/first-non-repeating-character/solutions/javascript-non-repeating/solution.js
@@ -0,0 +1,37 @@
+/**
+ * @param {string} string
+ */
+function solution (string) {
+  const lettersCount = {}
+  for (let index = 0; index < string.length; index++) {
+    const character = string[index]
+    if (lettersCount[character] == null) {
+      lettersCount[character] = {
+        total: 1,
+        firstIndex: index,
+        value: character
+      }
+    } else {
+      lettersCount[character].total += 1
+    }
+  }
+
+  let result = null
+  for (const character in lettersCount) {
+    const characterObject = lettersCount[character]
+    if (characterObject.total === 1) {
+      if (result == null) {
+        result = characterObject
+      } else if (characterObject.firstIndex < result.firstIndex) {
+        result = characterObject
+      }
+    }
+  }
+
+  if (result == null) {
+    return ''
+  }
+  return result.value
+}
+
+module.exports = solution