Go zip

why zip.md

func Zip[T any](a, b []T) ([][2]T, error) {
    if len(a) != len(b) {
        return nil, fmt.Errorf("zip: lengths differ")
    }
    r := make([][2]T, len(a))
    for i, e := range a {
        r[i] = [2]T{e, b[i]}
    }
    return r, nil
}

Why zip?

1. Indexes and values

Keys and values before building a map

Imagine:

keys: ["id1", "id2", "id3"]

values: [100, 200, 300]

You can zip them first, then decide how to store them (like a map[string]int):

[{id1 100}, {id2 200}, {id3 300}]

2. Merging sensor or log data

1. One system gives you timestamps.
2. Another gives you readings.

You zip them to make a dataset of {time, reading} pairs. Without pairing, your time-series data becomes meaningless.

3. Sending related data together

When sending large datasets across the internet: If you just dump a flat list of numbers, the receiver won't know how they connect.

If you zip them (e.g., [latitude, longitude] pairs), the meaning is preserved.