woops. revert last edit.

SliceTricks.md

@@ -29,6 +29,12 @@ a = append(a[:i], a[i+1:]...)
 a = a[:i+copy(a[i:], a[i+1:])]
 ```
 
+> **Delete without preserving order**
+```go
+a[i] = a[len(a)-1]
+a = a[:len(a)-1]
+```
+
 **NOTE** If the type of the element is a _pointer_ or a struct with pointer fields, which need to be garbage collected, the above implementations of ` Cut ` and ` Delete ` have a potential _memory leak_ problem: some elements with values are still referenced by slice ` a ` and thus can not be collected. The following code can fix this problem:
 > **Cut**
 ```go