tasks a-s

Task/Run-length-encoding/JavaScript/run-length-encoding-1.js

@@ -0,0 +1,15 @@
+function encode(input) {
+    var encoding = [];
+    var prev, count, i;
+    for (count = 1, prev = input[0], i = 1; i < input.length; i++) {
+        if (input[i] != prev) {
+            encoding.push([count, prev]);
+            count = 1;
+            prev = input[i];
+        }
+        else
+            count ++;
+    }
+    encoding.push([count, prev]);
+    return encoding;
+}

Task/Run-length-encoding/JavaScript/run-length-encoding-2.js

@@ -0,0 +1,5 @@
+function encode_re(input) {
+    var encoding = [];
+    input.match(/(.)\1*/g).forEach(function(substr){ encoding.push([substr.length, substr[0]]) });
+    return encoding;
+}

Task/Run-length-encoding/JavaScript/run-length-encoding-3.js

@@ -0,0 +1,5 @@
+function decode(encoded) {
+    var output = "";
+    encoded.forEach(function(pair){ output += new Array(1+pair[0]).join(pair[1]) })
+    return output;
+}