Practice

1. Create a folder called practice
2. Create a file and name it whatever you like
3. Create a Test file and name it whatever you like but append _test.go to the end of the name

Exercise 1:

Write a function that computes the standard deviation using a closure and formats the number using 2 decimal places. Write a test function to test the newly created function.

Exercise Solution

Exercise 2:

Write a function that reads the service_plans.json file and formats the json into Golang types

type ServicePlans struct {
    TotalResults int         `json:"total_results"`
    TotalPages   int         `json:"total_pages"`
    PrevURL      interface{} `json:"prev_url"`
    NextURL      interface{} `json:"next_url"`
    Resources    []struct {
        Metadata struct {
            GUID      string    `json:"guid"`
            URL       string    `json:"url"`
            CreatedAt time.Time `json:"created_at"`
            UpdatedAt time.Time `json:"updated_at"`
        } `json:"metadata"`
        Entity struct {
            Name                string      `json:"name"`
            Free                bool        `json:"free"`
            Description         string      `json:"description"`
            ServiceGUID         string      `json:"service_guid"`
            Extra               interface{} `json:"extra"`
            UniqueID            string      `json:"unique_id"`
            Public              bool        `json:"public"`
            Active              bool        `json:"active"`
            Bindable            bool        `json:"bindable"`
            ServiceURL          string      `json:"service_url"`
            ServiceInstancesURL string      `json:"service_instances_url"`
        } `json:"entity"`
    } `json:"resources"`
}

Please use the following struct to help you along

Also write a test file to test this.

Steps to see solution

1. cd json_manipulation
2. Open json_manipulation.go and json_manipulation_test.go
3. Run go test

Exercise 3:

Write a recursive function that sums up the values of an integer along with a test.

Exercise Solution

Exercise 4:

Write a function using callbacks that filters a list of ints

Exercise Solution

Exercise 5:

Write a function in its own package that reverses a string and write a test for it.

Steps to see solution:

1. cd reverse
2. Open reverse.go and reverse_test.go
3. Run go test

Exercise 6:

Write a function that queries Github Api for users and finds the repos with the most stargazers

Steps to see solution:

1. cd flatten
2. Open flatten.go and flatten_test.go
3. Run go test

Go Playground Solution