add: getting-the-distinct-transactions

Author: supercodestart

README.md

@@ -3,4 +3,5 @@
 - [Filling all the missed angle brackets](filling-all-the-missed-angle-brackets)
 - [Finding all the anagrams](finding-all-the-anagrams)
 - [Finding the maximum depth of a binary tree](finding-the-maximum-depth-of-a-binary-tree)
+- [Getting the distinct transactions](getting-the-distinct-transactions)
 - [Replacing with the cipher letters](replacing-with-the-cipher-letters)

getting-the-distinct-transactions/README.md

@@ -0,0 +1,45 @@
+# Getting the distinct transactions
+
+Fix the below code for only the distinct transactions
+
+```javascript
+const solution = (transactions, taxRate) => {
+  let numCalls = 0;
+
+  const calculateCostAfterTax = (cost, taxRate) => {
+    numCalls = numCalls + 1;
+    return cost * taxRate;
+  };
+
+  const computeTotal = (taxRate) => {
+    return (cost) => {
+      return calculateCostAfterTax(cost, taxRate);
+    };
+  };
+
+  transactions.map(computeTotal(taxRate));
+
+  return numCalls;
+};
+```
+
+e.g.:
+
+Input
+
+```console
+transactions = [3, 4, 3, 7, 4, 9]
+taxRate = 2.5
+```
+
+Output
+
+```console
+4
+```
+
+## Execute
+
+```bash
+node solution.js
+```

getting-the-distinct-transactions/solution.js

@@ -0,0 +1,26 @@
+const solution = (transactions, taxRate) => {
+  let numCalls = 0;
+
+  const calculateCostAfterTax = (cost, taxRate) => {
+    numCalls = numCalls + 1;
+    return cost * taxRate;
+  };
+
+  const computeTotal = (taxRate) => {
+    return (cost) => {
+      return calculateCostAfterTax(cost, taxRate);
+    };
+  };
+
+  const distinctTransactions = new Set(transactions);
+
+  Array.from(distinctTransactions).map(
+    computeTotal(taxRate),
+  );
+
+  return numCalls;
+};
+
+(() => {
+  console.log(solution([3, 4, 3, 7, 4, 9], 2.5));
+})();