run-length-encoding-exercise: added new exercise.

config.json

@@ -239,6 +239,14 @@
         "prerequisites": [],
         "difficulty": 6
       },
+      {
+        "slug": "run-length-encoding",
+        "name": "Run-Length Encoding",
+        "uuid": "3ce411fd-a8d5-4030-b8f8-7ba934227ce1",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 8
+      },
       {
         "slug": "knapsack",
         "name": "Knapsack",

exercises/practice/run-length-encoding/.docs/instructions.append.md

@@ -0,0 +1,5 @@
+## Reserved Memory
+
+The buffer for the input string uses bytes 64-319 of linear memory.
+
+The input string can be modified in place if desired.

exercises/practice/run-length-encoding/.docs/instructions.md

@@ -0,0 +1,20 @@
+# Instructions
+
+Implement run-length encoding and decoding.
+
+Run-length encoding (RLE) is a simple form of data compression, where runs (consecutive data elements) are replaced by just one data value and count.
+
+For example we can represent the original 53 characters with only 13.
+
+```text
+"WWWWWWWWWWWWBWWWWWWWWWWWWBBBWWWWWWWWWWWWWWWWWWWWWWWWB"  ->  "12WB12W3B24WB"
+```
+
+RLE allows the original data to be perfectly reconstructed from the compressed data, which makes it a lossless data compression.
+
+```text
+"AABCCCDEEEE"  ->  "2AB3CD4E"  ->  "AABCCCDEEEE"
+```
+
+For simplicity, you can assume that the unencoded string will only contain the letters A through Z (either lower or upper case) and whitespace.
+This way data to be encoded will never contain any numbers and numbers inside data to be decoded always represent the count for the following character.

exercises/practice/run-length-encoding/.eslintrc

@@ -0,0 +1,18 @@
+{
+  "root": true,
+  "extends": "@exercism/eslint-config-javascript",
+  "env": {
+    "jest": true
+  },
+  "overrides": [
+    {
+      "files": [
+        "*.spec.js"
+      ],
+      "excludedFiles": [
+        "custom.spec.js"
+      ],
+      "extends": "@exercism/eslint-config-javascript/maintainers"
+    }
+  ]
+}

exercises/practice/run-length-encoding/.meta/config.json

@@ -0,0 +1,22 @@
+{
+  "authors": [
+    "SimaDovakin"
+  ],
+  "contributors": [
+    "keiravillekode"
+  ],
+  "files": {
+    "solution": [
+      "run-length-encoding.wat"
+    ],
+    "test": [
+      "run-length-encoding.spec.js"
+    ],
+    "example": [
+      ".meta/proof.ci.wat"
+    ]
+  },
+  "blurb": "Implement run-length encoding and decoding.",
+  "source": "Wikipedia",
+  "source_url": "https://en.wikipedia.org/wiki/Run-length_encoding"
+}