collapse array

Author: prolazy

collapse.js

@@ -0,0 +1,14 @@
+function collapse(n) {
+    const arr = this;
+    const result = [];
+
+    for (let i = 0; i < arr.length; i++) {
+        if (Array.isArray(arr[i])) {
+            result.push(...arr[i]);
+        } else {
+            result.push(arr[i]);
+        }
+    }
+
+    return result;
+}