diff --git a/eloquentjavascript/05_higher_order_functions/composability.js b/eloquentjavascript/05_higher_order_functions/composability.js
new file mode 100644
index 0000000..e69de29
diff --git a/eloquentjavascript/05_higher_order_functions/exercises.js b/eloquentjavascript/05_higher_order_functions/exercises.js
new file mode 100644
index 0000000..ba4b234
--- /dev/null
+++ b/eloquentjavascript/05_higher_order_functions/exercises.js
@@ -0,0 +1,17 @@
+let arrays = [[1,2,3], [4,5],[6,7]];
+let newArray = [];
+let newArray2 = arrays.flat();
+
+for (let key in arrays) newArray = newArray.concat(arrays[key]);
+// arrays.forEach((v) => {
+//     newArray.push(v);
+//     newArray.concat(v);
+// })
+// function reduceArrays(){
+//     for (array of arrays) {
+//         console.log(array,count)
+
+//     } 
+// }
+//reduceArrays();
+console.log(newArray2);