binary draft

6-binary/01-arraybuffer-and-views/01-concat/_js.view/solution.js

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+function concat(arrays) {
+  // sum of individual array lengths
+  let totalLength = arrays.reduce((acc, value) => acc + value.length, 0);
+
+  if (!arrays.length) return null;
+
+  let result = new Uint8Array(totalLength);
+
+  // for each array - copy it over result
+  // next array is copied right after the previous one
+  let length = 0;
+  for(let array of arrays) {
+    result.set(array, length);
+    length += array.length;
+  }
+
+  return result;
+}