RogerBW solutions for challenge no. 258

2 files changed, 82 insertions, 0 deletions

diff --git a/challenge-258/roger-bell-west/javascript/ch-1.js b/challenge-258/roger-bell-west/javascript/ch-1.js
new file mode 100755
index 0000000000..fb9668f84d
--- /dev/null
+++ b/challenge-258/roger-bell-west/javascript/ch-1.js
@@ -0,0 +1,38 @@
+#! /usr/bin/node
+
+"use strict"
+
+function countevendigitsnumber(a) {
+    let t = 0;
+    for (let p of a) {
+        let even = false;
+        let pt = p;
+        while (pt >= 10) {
+            pt = Math.floor(pt / 10);
+            even = !even;
+        }
+        if (even) {
+            t += 1;
+        }
+    }
+    return t;
+}
+
+if (countevendigitsnumber([10, 1, 111, 24, 1000]) == 3) {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write(" ");
+if (countevendigitsnumber([111, 1, 11111]) == 0) {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write(" ");
+if (countevendigitsnumber([2, 8, 1024, 256]) == 1) {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write("\n");
diff --git a/challenge-258/roger-bell-west/javascript/ch-2.js b/challenge-258/roger-bell-west/javascript/ch-2.js
new file mode 100755
index 0000000000..a065cb06f6
--- /dev/null
+++ b/challenge-258/roger-bell-west/javascript/ch-2.js
@@ -0,0 +1,44 @@
+#! /usr/bin/node
+
+"use strict"
+
+function popcount64(x0) {
+    const M1  = 0x5555555555555555n;
+    const M2  = 0x3333333333333333n;
+    const M4  = 0x0f0f0f0f0f0f0f0fn;
+    const H01 = 0x0101010101010101n;
+    let x = BigInt(x0);
+    x -= (x >> 1n) & M1;
+    x = (x & M2) + ((x >> 2n) & M2);
+    x = (x + (x >> 4n)) & M4;
+    return Number((x * H01) >> 56n);
+}
+
+function sumofvalues(a, k) {
+    let s = 0;
+    a.forEach((v, i) => {
+        if (popcount64(i) == k) {
+            s += v;
+        }
+    });
+    return s;
+}
+
+if (sumofvalues([2, 5, 9, 11, 3], 1) == 17) {
+    process.stdout.write("Pass");
+} else {
+    process.stdout.write("FAIL");
+}
+process.stdout.write(" ");
+if (sumofvalues([2, 5, 9, 11, 3], 2) == 11) {
+    process.stdout.write("Pass");
+} else {
+    process.stdout.write("FAIL");
+}
+process.stdout.write(" ");
+if (sumofvalues([2, 5, 9, 11, 3], 0) == 2) {
+    process.stdout.write("Pass");
+} else {
+    process.stdout.write("FAIL");
+}
+process.stdout.write("\n");