Free GoLang Standard Library Questions and Answers — Questions and Answers

Question 1: Which of the following strings package functions are used to manipulate strings in Go?

strings.Contains (Correct answer)
strings.ToUpper (Correct answer)
strings.Replace (Correct answer)
strings.Sort

Correct answer: strings.Contains

The `strings` package in Go provides a rich set of functions for string manipulation. `strings.Contains` checks if a substring is present, `strings.ToUpper` converts a string to uppercase, and `strings.Replace` replaces occurrences of a substring. `strings.Sort` is not a function in the `strings` package; sorting is typically done using the `sort` package on slices of strings.

Question 2: Which package is primarily used for file handling in Go?

io
os (Correct answer)
bufio (Correct answer)
file

Correct answer: os

The `os` package in Go provides a platform-independent interface to operating system functionality, including file and directory operations. While `io` provides basic interfaces for I/O primitives and `bufio` offers buffered I/O, `os` is the primary package for direct file handling like opening, creating, and removing files.

Question 3: Which functions from the encoding/json package are commonly used for JSON encoding and decoding in Go?

json.Marshal (Correct answer)
json.Unmarshal (Correct answer)
json.Encode
json.Parse

Correct answer: json.Marshal

The `encoding/json` package in Go provides functions for encoding and decoding JSON data. `json.Marshal` is used to encode a Go value into its JSON representation (a byte slice), and `json.Unmarshal` is used to decode JSON data into a Go value. These are the primary functions for converting between Go structs and JSON data.

Question 4: Which functions are used from the net/http package to set up an HTTP server in Go?

http.ListenAndServe (Correct answer)
http.HandleFunc (Correct answer)
http.Serve
http.RequestHandler

Correct answer: http.ListenAndServe

To set up an HTTP server in Go, `http.ListenAndServe` is commonly used to start the server and listen for incoming requests on a specified address and port. `http.HandleFunc` registers a function to handle requests for a given URL path. Together, these functions form the basic building blocks for a Go HTTP server.

Question 5: Which functions are used from the sort package to sort slices in Go?

sort.Ints (Correct answer)
sort.Strings (Correct answer)
sort.Float64s (Correct answer)
sort.SortStrings

Correct answer: sort.Ints

The `sort` package in Go provides functions for sorting slices of various types. `sort.Ints` sorts a slice of integers, `sort.Strings` sorts a slice of strings, and `sort.Float64s` sorts a slice of float64s. These specialized functions offer convenient ways to sort common primitive slice types.

Free GoLang Standard Library Questions and Answers

Which of the following strings package functions are used to manipulate strings in Go?