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For issue #29436

Ian Lance Taylor 2018-12-27 14:17:54 -08:00
parent d7b1f5842d
commit c69144a8ce
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2
SliceTricks.md

@ -76,7 +76,7 @@ a = append(a[:i], append([]T{x}, a[i:]...)...)
**NOTE** The second ` append ` creates a new slice with its own underlying storage and copies elements in ` a[i:] ` to that slice, and these elements are then copied back to slice ` a ` (by the first ` append `). The creation of the new slice (and thus memory garbage) and the second copy can be avoided by using an alternative way: **NOTE** The second ` append ` creates a new slice with its own underlying storage and copies elements in ` a[i:] ` to that slice, and these elements are then copied back to slice ` a ` (by the first ` append `). The creation of the new slice (and thus memory garbage) and the second copy can be avoided by using an alternative way:
> **Insert** > **Insert**
```go ```go
s = append(s, 0) s = append(s, 0 /* use the zero value of the element type */)
copy(s[i+1:], s[i:]) copy(s[i+1:], s[i:])
s[i] = x s[i] = x
``` ```