Go (Programming Language) MCQs (Chapterwise Multiple Choice Questions)

What is an idiomatic way to customize the representation of a custom struct in a formatted string?

There is no customizing the string representation of a type.

Build it in pieces each time by calling individual fields.

Implement a method String() string

Create a wrapper function that accepts your type and outputs a string.

Answer & Explanation

Correct Answer: Implement a method String() string

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Which encodings can you put in a string?

Any, it accepts arbitary bytes

Any Unicode format

UTF-8 or ASCII

UTF-8

Answer & Explanation

Correct Answer: UTF-8

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What is a channel?

A global variable

A medium for sending values between goroutines

A dynamic array of values

A lightweight thread for concurrent programming

Answer & Explanation

Correct Answer: A medium for sending values between goroutines

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If you iterate over a map in a for range loop, in which order will the key:value pairs be accessed?

In pseudo-random order that cannot be predicted

In reverse order of how they were added, last in first out

Sorted by key in ascending order

In the order they were added, first in first out

Answer & Explanation

Correct Answer: In pseudo-random order that cannot be predicted

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What is the common way to have several executables in your project?

Have a cmd directory and a directory per executable inside it.

Comment out main.

Use build tags.

Have a pkg directory and a directory per executable inside it.

Answer & Explanation

Correct Answer: Have a cmd directory and a directory per executable inside it.

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How is the behavior of t.Fatal different inside a t.Run?

There is no difference.

T.Fatal does not crash the test harness, preserving output messages.

T.Fatal stops execution of the subtest and continues with other test cases.

T.Fatal stops all tests and contains extra information about the failed subtest.

Answer & Explanation

Correct Answer: T.Fatal stops execution of the subtest and continues with other test cases.

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What does the len() function return if passed a UTF-8 encoded string?

The number of characters

The number of bytes

It does not accept string types.

The number of code points

Answer & Explanation

Correct Answer: The number of bytes

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How do you tell go test to print out the tests it is running?

Go test

Go test -x

Go test --verbose

Go test -v

Answer & Explanation

Correct Answer: Go test -v

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What is the difference between the time package’s Time.Sub() and Time.Add() methods?

Time.Add() is for performing addition while Time.Sub() is for nesting timestamps.

Time.Add() always returns a later time while time.Sub always returns an earlier time.

They are opposites. Time.Add(x) is the equivalent of Time.Sub(-x).

Time.Add() accepts a Duration parameter and returns a Time while Time.Sub() accepts a Time parameter and returns a Duration.

Answer & Explanation

Correct Answer: Time.Add() accepts a Duration parameter and returns a Time while Time.Sub() accepts a Time parameter and returns a Duration.

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What should the idiomatic name be for an interface with a single method and the signature Save() error?

Saveable

SaveInterface

ISave

Saver

Answer & Explanation

Correct Answer: Saver

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