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Learn Go 10x faster with AI

Slices, errors, interfaces and goroutines explained plainly. Paste your code or error and Kuest helps you understand what Go expects.

4.87on iOS13,917,000+students already study with Kuest

topics
10
Created at
Google, open-sourced 2009
Type
Compiled, statically typed
Used for
Web servers, cloud tools, CLIs

See how Kuest teaches it

It asks before it tells, so you do the thinking and it sticks.

You: Why does func (c Counter) Inc() { c.n++ } not change my counter?
Kuest: Look at the receiver: (c Counter). When you call counter.Inc(), does the method get your counter or a copy?
You: Since it's not a pointer, I guess it gets a copy.
Kuest: Right, a value receiver is a copy. So what does c.n++ change?
You: Just the copy's n, which is thrown away when Inc returns.
Kuest: Exactly. How would you change the method so it updates the original?
You: Use a pointer receiver: func (c *Counter) Inc() { c.n++ }. Then it changes the real counter.

Value receivers get a copy; use a pointer receiver when a method needs to modify the struct.

Students who lock in with Kuest

students
13,917,000+
App Store rating
4.87
countries
100+
  • From a C to an A in chem

    “I stopped copying answers and started actually getting it. My chem grade went from a C to an A in one semester.”

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  • 3 hours → 40 minutes

    “My notes turn into a quiz in seconds. What used to take me all night now takes one episode of a show.”

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  • Finally ready for the SAT

    “The plan told me exactly what to do each day. I walked in calm for the first time ever.”

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  • It never lets me skip a step

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    Freshman, Ohio
  • Better than my tutor

    “It's there at midnight, it's patient, and it costs less than one session with my old tutor.”

    College freshman, Florida
  • My streak is at 94 days

    “The quests are ten minutes. I do them on the bus. Somehow I'm now the one explaining bio to my friends.”

    Junior, Illinois
  • Spanish finally clicked

    “Talking out loud with the tutor fixed my pronunciation faster than a whole year of class.”

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  • Parent here: no more 9pm meltdowns

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    Parent, Washington

The method

How to study Go with Kuest

Go is a small language, so you can learn most of it quickly, and the real skill is writing it the Go way. Write small programs often, handle every error explicitly, and trace slices and goroutines by hand until their behavior stops surprising you.

  1. Learn the building blocksTutor chat

    Ask about slices, structs or interfaces and answer Kuest's check questions before moving on.

  2. Bring your errorsSnap a photo

    Paste your code and the compiler error or panic, or snap your screen, and Kuest helps you read it.

  3. See slices and goroutinesTeaching board

    Use the teaching board to picture a slice's underlying array and how goroutines pass values over channels.

  4. Predict the behaviorQuizzes

    Answer quizzes on what append does to len and cap, or which goroutine prints first.

  5. Keep idioms freshFlashcards

    Review Go idioms like if err != nil, defer and the comma-ok pattern as spaced flashcards.

  6. Strengthen weak areasGap finder

    Let Kuest find what you keep missing, like pointer receivers or channels, and practice those.

What you'll cover

Tap a topic to learn it now.

  1. 01Packages, main and go runStructure a program with package main, imports and func main
  2. 02Variables and typesDeclare values with var and :=, and know zero values and basic types
  3. 03Control flowUse if, switch and the single for loop in all its forms
  4. 04Functions and multiple returnsReturn several values, including a value and an error
  5. 05Arrays, slices and mapsUse slices with append, len and cap, and store key-value data in maps
  6. 06Structs and methodsGroup data in structs and attach methods with value or pointer receivers
  7. 07InterfacesDefine behavior with interfaces that types satisfy implicitly
  8. 08Error handlingCheck if err != nil, wrap errors and return them clearly
  9. 09Goroutines and channelsRun work concurrently and coordinate it with channels and sync.WaitGroup
  10. 10Modules and testingManage dependencies with go mod and write tests with the testing package

Try asking

Tap a question and Kuest starts teaching it, step by step.

Helps you prepare for

  • Backend and systems courses
  • Project and internship work

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  • Booked days in advance
  • One subject per session
  • Stops when the hour ends

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$10a month, billed yearly

  • Every subject and exam on this site
  • Any hour, as long as you need
  • Quizzes, flashcards, podcasts and mock exams

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