diff --git a/collapse.js b/collapse.js
new file mode 100644
index 0000000..5d51f9d
--- /dev/null
+++ b/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;
+}
\ No newline at end of file
diff --git a/slice.js b/slice.js
new file mode 100644
index 0000000..5e32cab
--- /dev/null
+++ b/slice.js
@@ -0,0 +1,15 @@
+Array.prototype.ownSlice = function ownSlice (str, end) {
+    const arr = this;
+    const result = [];
+
+    if (Array.isArray(arr)) {
+        const loopContinue = end > arr.length ? arr.length : end;
+        for (let i = str; i < loopContinue; i++) {
+            result.push(arr[i]);
+        }
+    }
+    return result;
+}
+
+const arr = [1,2,3,4,5];
+console.log(arr.ownSlice(2,4))
\ No newline at end of file