Sorry, there’s no generic library function to do this. Go doesn’t have a straight forward way of writing a function that can operate on any slice. Your function works, although it would be a little better if you wrote it using range. If you happen to have a byte slice, there is bytes.IndexByte.
Well I used reflect.ValueOf and then if it is a slice you can call Len() and Index() on the value to get the len of the slice and element at an index. I don’t think you will be able to use the range operate to do this. package main import “fmt” import “reflect” func main() … Read more
Starting with Go 1.18 which adds generics support, there’s a golang.org/x/exp/slices package which contains a generic “find” function named slices.IndexFunc(): func IndexFunc[E any](s []E, f func(E) bool) int IndexFunc returns the first index i satisfying f(s[i]), or -1 if none do. Using that: idx := slices.IndexFunc(myconfig, func(c Config) bool { return c.Key == “key1” }) … Read more
Granted that the behavior is inconsistent, but I think it’s easy to imagine cases where this is convenient. Anyway, to get a DataFrame every time, just pass a list to loc. There are other ways, but in my opinion this is the cleanest. In [2]: type(df.loc[[3]]) Out[2]: pandas.core.frame.DataFrame In [3]: type(df.loc[[1]]) Out[3]: pandas.core.frame.DataFrame
Solution Yes, you can: l = L[1::2] And this is all. The result will contain the elements placed on the following positions (0-based, so first element is at position 0, second at 1 etc.): 1, 3, 5 so the result (actual numbers) will be: 2, 4, 6 Explanation The [1::2] at the end is just … Read more
As an addition to jimt’s post: You may also use append rather than explicitly assigning the values to their indices: m := make(map[int]string) m[1] = “a” m[2] = “b” m[3] = “c” m[4] = “d” v := make([]string, 0, len(m)) for _, value := range m { v = append(v, value) } Note that the … Read more
The __getitem__() method will receive a slice object when the object is sliced. Simply look at the start, stop, and step members of the slice object in order to get the components for the slice. >>> class C(object): … def __getitem__(self, val): … print val … >>> c = C() >>> c[3] 3 >>> c[3:4] … Read more
Simple declaration var s []int does not allocate memory and s points to nil, while s := make([]int, 0) allocates memory and s points to memory to a slice with 0 elements. Usually, the first one is more idiomatic if you don’t know the exact size of your use case.
Yes, Ruby has very similar array-slicing syntax to Python. Here is the ri documentation for the array index method: ————————————————————— Array#[] array[index] -> obj or nil array[start, length] -> an_array or nil array[range] -> an_array or nil array.slice(index) -> obj or nil array.slice(start, length) -> an_array or nil array.slice(range) -> an_array or nil ———————————————————————— Element … Read more
Setting the slice to nil is the best way to clear a slice. nil slices in go are perfectly well behaved and setting the slice to nil will release the underlying memory to the garbage collector. See playground package main import ( “fmt” ) func dump(letters []string) { fmt.Println(“letters = “, letters) fmt.Println(cap(letters)) fmt.Println(len(letters)) for … Read more