add RPN solver

snippets/RPNSolver.md

@@ -0,0 +1,24 @@
+### RPNSolver
+
+Solves the given reverse polish notation
+```js
+const RPNSolver = RPN => {
+  const isNumeric = str => !isNaN(parseFloat(str)) && isFinite(str);
+  const isOperator = str => ['*','-','+','/','**'].includes(str)
+  let stack = [];
+  let solve  = RPN.replace(/\^/g,'**').split(/\s+/g);
+  solve.forEach(symbol => {
+    isNumeric(symbol) ? stack.push(symbol) :
+          isOperator(symbol) ?
+          (a = stack.pop(),
+          b = stack.pop(),
+          stack.push(eval(a + symbol + b))) : Console.log('Wrong RPN')
+  }
+)
+return stack.pop()
+}
+```
+
+```js
+
+```