NODE!

1 files changed, 58 insertions, 0 deletions

diff --git a/challenge-134/dave-jacoby/node/ch-1.js b/challenge-134/dave-jacoby/node/ch-1.js
new file mode 100644
index 0000000000..47bb3a0cb9
--- /dev/null
+++ b/challenge-134/dave-jacoby/node/ch-1.js
@@ -0,0 +1,58 @@
+"use strict;";
+
+let output = [];
+pandigital(["1"]);
+for (i in output) {
+  console.log(["", output[i]].join("\t"));
+}
+
+function pandigital(state) {
+  let digits = {};
+  let numbers = [];
+  // we have the first five, we're done
+  if (output.length > 4) {
+    return;
+  }
+  // there was some duplicate issues, so we use
+  // indexOf to see if that value is in the array
+  // already
+  if (state.length == 10) {
+    let pandigit = state.join("");
+    if (output.indexOf(pandigit) === -1) {
+      output.push(pandigit);
+      return;
+    }
+  }
+  // I think I would normally prefer if
+  // for ( i in array ) would give me the value
+  // within the array not the index, but there
+  // are enough times that I want just that, so
+  // I don't need that change
+  for (let i in state) {
+    let n = state[i];
+    digits[n] = 1;
+  }
+  // the long way around getting a range
+  let range = Array(10)
+    .fill()
+    .map((n, i) => i);
+  // yes, I could've probably written a filter,
+  // but this is understandable
+  for (let i in range) {
+    if (digits[i] === undefined) {
+      numbers.push(i);
+    }
+  }
+  // the duplicates issue was related to
+  // losing track of the parens, so that
+  // this loop was inside the range loop
+  // above, but it works and I've featured
+  // the cool indexOf method, so I'll let
+  // the belt-and-suspenders solution stand.
+  for (let i in numbers) {
+    let n = numbers[i];
+    let newstate = [...state];
+    newstate.push(n);
+    pandigital(newstate);
+  }
+}