Add Maximum Subarray in Javascript

archive/j/javascript/maximum-subarray.js

@@ -0,0 +1,48 @@
+function printUsage() {
+  console.log(
+    'Usage: Please provide a list of integers in the format: "1, 2, 3, 4, 5"',
+  );
+}
+
+function maxSubarraySum(arr) {
+  let maxSoFar = -Infinity;
+  let maxEndingHere = 0;
+
+  for (let num of arr) {
+    maxEndingHere += num;
+
+    if (maxSoFar < maxEndingHere) {
+      maxSoFar = maxEndingHere;
+    }
+
+    if (maxEndingHere < 0) {
+      maxEndingHere = 0;
+    }
+  }
+
+  return maxSoFar;
+}
+
+function main() {
+  const args = process.argv.slice(2);
+
+  if (args.length < 1 || args[0] === "") {
+    printUsage();
+    process.exit(1);
+  }
+  const input = args[0];
+  const arr = input.split(",").map((token) => parseInt(token.trim(), 10));
+
+  if (arr.length === 1) {
+    console.log(arr[0]);
+    return;
+  } else if (arr.length === 0) {
+    printUsage();
+    process.exit(1);
+  }
+  const result = maxSubarraySum(arr);
+
+  console.log(result);
+}
+
+main();