Initial data commit

Task/Parsing-RPN-calculator-algorithm/JavaScript/parsing-rpn-calculator-algorithm.js

@@ -0,0 +1,26 @@
+const e = '3 4 2 * 1 5 - 2 3 ^ ^ / +';
+const s = [], tokens = e.split(' ');
+for (const t of tokens) {
+  const n = Number(t);
+  if (!isNaN(n)) {
+    s.push(n);
+  } else {
+    if (s.length < 2) {
+      throw new Error(`${t}: ${s}: insufficient operands.`);
+    }
+    const o2 = s.pop(), o1 = s.pop();
+    switch (t) {
+      case '+': s.push(o1 + o2); break;
+      case '-': s.push(o1 - o2); break;
+      case '*': s.push(o1 * o2); break;
+      case '/': s.push(o1 / o2); break;
+      case '^': s.push(Math.pow(o1, o2)); break;
+      default: throw new Error(`Unrecognized operator: [${t}]`);
+    }
+  }
+  console.log(`${t}: ${s}`);
+}
+
+if (s.length > 1) {
+  throw new Error(`${s}: insufficient operators.`);
+}