umka-lang

umka-lang copied to clipboard

This is needed often when I maintain a sorted array and need to keep the ordering correct.

@skejeton As a workaround, you can now use append():

type T = int

fn insert(a: []T, i: int, v: T): []T {
        return append(append(slice(a, 0, i), v), slice(a, i))
}

fn main() {
        a := []int{1, 3, 4, 5}
        b := insert(a, 1, 2)        
        printf(repr(a) + repr(b) + '\n')        // { 1 3 4 5 } { 1 2 3 4 5 }        
}

Go also encourages this idiom.

hmm seems quite more cumbersome (for a scripting language at least)

although it's not such a big deal because i need it only in handful of places

Another implementation with just one append():

fn insert(a: []T, i: int, v: T): []T {
        if i == len(a) {
                return append(a, v)
        }
        b := append(slice(a, 0, i + 1), slice(a, i))
        b[i] = v
        return b
}

Borrowed from here: https://stackoverflow.com/questions/46128016/insert-a-value-in-a-slice-at-a-given-index

Thank you. Just in time as I was going to need it :P