Merge pull request #2005 from jacoby/master

Node!

1 files changed, 66 insertions, 0 deletions

diff --git a/challenge-071/dave-jacoby/node/ch-1.js b/challenge-071/dave-jacoby/node/ch-1.js
new file mode 100755
index 0000000000..d162c39917
--- /dev/null
+++ b/challenge-071/dave-jacoby/node/ch-1.js
@@ -0,0 +1,66 @@
+"use strict;";
+
+// get N
+
+// argv[0] = node
+// argv[1] = this program
+let n = process.argv[2];
+n = parseInt(n);
+
+process.on("exit", function (code) {
+  if (code != 0) {
+    return console.log(`About to exit with code ${code}`);
+  }
+});
+
+if (!Number.isInteger(n)) {
+  n = 7;
+}
+
+// control number range;
+if (n < 1 || n > 50) {
+  process.exit(22);
+}
+
+// do the work
+let values = create_array(n);
+let peaks = find_peaks(values);
+
+// remove the beginning and ending 0
+values.pop();
+values.shift();
+
+console.log('VALUES');
+console.dir(values);
+console.log('');
+console.log('PEAKS');
+console.dir(peaks);
+
+// find peak values in the array
+function find_peaks(values) {
+  let output = [];
+  for (let i = 0; i < values.length; i++) {
+    if (i > 0 && i < values.length - 1) {
+      if (values[i] > values[i - 1] && values[i] > values[i + 1]) {
+        output.push(values[i]);
+      }
+    }
+  }
+  return output;
+}
+
+// create array
+function create_array(max) {
+  let values = [];
+  while (values.length < max) {
+    let value = 1 + Math.floor(50 * Math.random());
+    if (!values.includes(value)) {
+      values.push(value);
+    }
+  }
+
+  // adding zero to beginning to end removes odd cases
+  values.unshift(0);
+  values.push(0);
+  return values;
+}