fast way to insert element at index 0
Dennis Ritchie via Digitalmars-d-learn
digitalmars-d-learn at puremagic.com
Mon Jun 22 22:33:47 PDT 2015
On Tuesday, 23 June 2015 at 05:16:23 UTC, Assembly wrote:
> What's a fast way to insert an element at index 0 of array? now
> that the code is working I want to clean this:
>
> void push(T val)
> {
> T[] t = new T[buffer.length + 1];
> t[0] = val;
> t[1 .. $] = buffer;
> buffer = t;
> }
>
> I did this because I didn't find any suble built-in data
> structure that let me insert an item into a specific index at
> first search. Slist does have insertFron(), exactly what I'm
> looking for it's a linked list.
I think you want to do something like this:
void main() {
import std.algorithm;
auto a = [1, 2, 3];
int val = 5;
a = val ~ a; // vector.pushFront();
assert(equal(a[], [5, 1, 2, 3]));
}
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