From 8e93bfbff682af7a3de99ed078bbe5e1af765f79 Mon Sep 17 00:00:00 2001
From: Divlo <contact@divlo.fr>
Date: Tue, 29 Sep 2020 13:04:50 +0000
Subject: [PATCH] feat: add reverse-polish-notation javascript solution

---
 .gitignore                                    |  3 +-
 .../solutions/javascript-solution/README.md   |  5 +++
 .../solutions/javascript-solution/solution.js | 31 +++++++++++++++++++
 3 files changed, 38 insertions(+), 1 deletion(-)
 create mode 100644 challenges/reverse-polish-notation/solutions/javascript-solution/README.md
 create mode 100644 challenges/reverse-polish-notation/solutions/javascript-solution/solution.js

diff --git a/.gitignore b/.gitignore
index 55371e5..13fe3b2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 node_modules
-.vscode
\ No newline at end of file
+.vscode
+.theia
\ No newline at end of file
diff --git a/challenges/reverse-polish-notation/solutions/javascript-solution/README.md b/challenges/reverse-polish-notation/solutions/javascript-solution/README.md
new file mode 100644
index 0000000..5a1da1d
--- /dev/null
+++ b/challenges/reverse-polish-notation/solutions/javascript-solution/README.md
@@ -0,0 +1,5 @@
+# javascript-solution - reverse-polish-notation
+
+Programming language : JavaScript
+
+Created by [@Divlo](https://github.com/Divlo) on 29 September 2020.
diff --git a/challenges/reverse-polish-notation/solutions/javascript-solution/solution.js b/challenges/reverse-polish-notation/solutions/javascript-solution/solution.js
new file mode 100644
index 0000000..4e62170
--- /dev/null
+++ b/challenges/reverse-polish-notation/solutions/javascript-solution/solution.js
@@ -0,0 +1,31 @@
+const operations = {
+  '+': (n1, n2) => n1 + n2,
+  '-': (n1, n2) => n1 - n2,
+  '*': (n1, n2) => n1 * n2,
+  '/': (n1, n2) => n1 / n2
+}
+
+function solution(value) {
+  if (value.length === 0) {
+    return 0
+  }
+
+  const stack = []
+  const values = value.split(' ')
+  values.forEach((value) => {
+    const number = Number(value)
+    if (!isNaN(number)) {
+      stack.push(number)
+    } else if (operations.hasOwnProperty(value)) {
+      const number1 = stack.pop()
+      const number2 = stack.pop()
+      const operation = operations[value]
+      const result = operation(number2, number1)
+      stack.push(result)
+    }
+  })
+
+  return stack.pop()
+}
+
+module.exports = solution