Reports

Use type parameters to eliminate code duplication:

// GetJson decodes the resource at url to T and returns the result.
func GetJson[T any](url string) (T, error) {
    req, err := http.NewRequest("GET", url, nil)
    // commented out error handling

    resp, err := myClient.Do(req)
    // commented out error handling

    defer resp.Body.Close()

    var target T
    err = json.NewDecoder(resp.Body).Decode(target)
    // commented out error handling

    return target, err
}

// GetJsons decodes each resource at urls to a T and returns
// a slice of the results.
func GetJsons[T any](urls []string) ([]T, []error) {
    errors := make([]error, len(urls))
    targets := make([]T, len(urls))
    var wg sync.WaitGroup
    wg.Add(len(urls))
    for i, url := range urls {
        go func() {
            defer wg.Done()
            targets[i], errors[i] = GetJson[T](url)
        }()
    }
    wg.Wait()
    return targets, errors
}

Example use:

hashmaps, errors := GetJsons[Map](urls)

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