Weekly Challenge Blast from the Past

2 files changed, 60 insertions, 0 deletions

diff --git a/challenge-008/zapwai/javascript/ch-1.js b/challenge-008/zapwai/javascript/ch-1.js
new file mode 100644
index 0000000000..44351de732
--- /dev/null
+++ b/challenge-008/zapwai/javascript/ch-1.js
@@ -0,0 +1,30 @@
+function is_perfect(num) {
+    let divs = list_divisors(num);
+    let sum = 0;
+    divs.forEach(item => {
+	sum += item;
+    });
+    return (num == sum);
+}
+
+function list_divisors(num) {
+    let divs = [1];
+    for (let i = 2; i <= num/2; i++) {
+	if (num % i == 0)
+	    divs.push(i);
+    }
+    return divs;
+}
+
+let perfect_numbers = [];
+
+for (let p = 2; p <= 15; p++) {
+    let num = Math.pow(2, p-1) * (Math.pow(2,p) - 1);
+    if (is_perfect(num))
+	perfect_numbers.push(num);
+    if (perfect_numbers.length == 5)
+	break;
+}
+
+console.log(perfect_numbers);
+
diff --git a/challenge-008/zapwai/javascript/ch-2.js b/challenge-008/zapwai/javascript/ch-2.js
new file mode 100644
index 0000000000..e2f7dfaa46
--- /dev/null
+++ b/challenge-008/zapwai/javascript/ch-2.js
@@ -0,0 +1,30 @@
+function center(words) {
+    let lens = [];
+    for (let word of words)
+	lens.push(word.length);
+    let m = max(lens);
+    let ind = 0;
+    for (let l of lens) {
+	let sp = (m - l) / 2;
+	let s = "";
+	for (let i = 0; i < sp; i++)
+	    s += "&nbsp";
+	s += words[ind] + "<br>";
+	ind++;
+	document.write(s);
+    }
+}
+
+
+function max (nums) {
+    let max = 0;
+    for (let n of nums) {
+	if (max < n)
+	    max = n;
+    }
+    return max;
+}
+
+let words = ["This", "is", "a test of the", "center function"];
+center(words);
+console.log(max([3, 5, 7, 1, 15]));