In general, the answer is itertools.islice, but you should note that islice doesn’t, and can’t, actually skip values. It just grabs and throws away start values before it starts yield-ing values. So it’s usually best to avoid islice if possible when you need to skip a lot of values and/or the values being skipped are … Read more
The value for a variadic argument can be specified either by enumerating the elements, or using an existing slice, specified by its name followed by …. You want to mix the 2 possible ways which is not permitted by the Go Language Specification (Passing arguments to … parameters). If the first form is used (enumerating … Read more
A slice is really just a fancy way to manage an underlying array. It automatically tracks size, and re-allocates new space as needed. As you append to a slice, the runtime doubles its capacity every time it exceeds its current capacity. It has to copy all of the elements to do that. If you know … Read more
Equivalent method in Scala (with a slightly different syntax) exists for all kinds of sequences: scala> “Hello world” slice(0,4) res0: String = Hell scala> (1 to 10) slice(3,5) res1: scala.collection.immutable.Range = Range(4, 5) The biggest difference compared to slicing in Python is that start and end indices are mandatory in Scala.
In Go no value is safe for concurrent read/write, slices (which are slice headers) are no exception. Yes, your code has data races. Run with the -race option to verify. Example: type myClass struct { AttributeName string } sourceSlice := make([]myClass, 100) destSlice := make([]myClass, 0) var wg sync.WaitGroup for _, myObject := range sourceSlice … Read more
All your variables have a slice type. Slices have a backing array. In Go you can’t access uninitialized variables. If you don’t explicitly provide a value when you create a new variable, they will be initialized with the zero value of the variable’s type. This means when you create a slice with make([]int, 0, 5), … Read more
I think the docs are perhaps a little misleading on this, but the optional arguments of slicing if omitted are the same as using None: >>> a = “hello” >>> a[::-1] ‘olleh’ >>> a[None:None:-1] ‘olleh’ You can see that these 2 above slices are identical from the CPython bytecode: >>> import dis >>> dis.dis(‘a[::-1]’) # … Read more
There is more to arrays than just the fixed length: they are comparable, and they are values (not reference or pointer types). There are countless advantages of arrays over slices in certain situations, all of which together more than justify the existence of arrays (along with slices). Let’s see them. (I’m not even counting arrays … Read more
You can read more about slices here. But I think this passage answers your question: Slicing does not copy the slice’s data. It creates a new slice value that points to the original array. This makes slice operations as efficient as manipulating array indices. Therefore, modifying the elements (not the slice itself) of a re-slice … Read more