Presentation Title

Five Go Gotchas I Learned the Hard Way Jordan H. Ferenz

Copyright @ 2018 Aqua Security Software Ltd. All Rights Reserved.

Jordan H. Ferenz ◼ An autodidact techie ◼ A Hacker ◼ Writing code 15Y+ ◼ Enthusiast Photographer ◼ Software developer at Aqua Security

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Aqua Security: Company Snapshot TEAM

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80 passionate, experienced innovators coming from:

BACKED BY Microsoft Ventures | Lightspeed | Shlomo Kramer | TLV Partners

 Boston  San Francisco

 Tel Aviv 3

Gotcha #1: JSON Memory Leak ◼ JavaScript Object Notation ◼ Lightweight data-interchange format ◼ Easy to read and write – even in GO!

◼ You’re using the JSON package wrong

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Gotcha #1: JSON Memory Leak

Let’s code...

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Gotcha #2: Static Functions ◼ Is Go Object-Oriented? Yes and no ◼ Object-Oriented programming style ◼ Methods are more generic than in

C++ or Java ◼ Function of uninitiated structure?

Static function

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Gotcha #2: Static Functions

Let’s code...

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Gotcha #3: Buffered Channels != Queues ◼ Communicating Sequential Processes ◼ Channels – First class values ◼ Channels – Unbuffered or buffered ◼ Buffered channels block too

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Gotcha #3: Channels != Queues

Let’s code...

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Gotcha #4: Don’t Panic! ◼ Errors – The idiomatic way of dealing

with abnormal conditions ◼ Panic – Program cannot continue

execution ◼ Recover – Regain control from a

panic goroutine ◼ Recover only from within goroutine

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Gotcha #4: Don’t Panic!

Let’s code...

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Gotcha #5: Type Magic – Type Overloading ◼ Go is a strictly typed language ◼ Variables can only carry values of the

type they were declared to be ◼ Composite types ("unnamed types"):

Building blocks for new types ◼ Declare types by binding an identifier to

an existing underlying type

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Gotcha #5: Type Magic – Type Overloading

Let’s code...

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Gotcha #5: Type Magic – Type Casting ◼ Go is a strictly typed language ◼ Values can be cast into other types ◼ Casting does not always work ◼ Casting fails silently

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Gotcha #5: Type Magic – Type Casting

Let’s code...

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◼ The world’s only container Wiki: www.aquasec.com/wiki

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Thank You

Go gopher drawings provided by https://github.com/egonelbre/gophers, under CC0. The Go gopher was designed by Renee French. The Gopher character design is licensed under the Creative Commons 3.0 Attributions license.