What are bitmasks in Go?

Bitmasks pack multiple booleans into one integer using distinct bits, manipulated with bitwise operators like | for OR and & for AND checks.

How do I use iota for Go flags?

const ( Flag1 = 1 << iota Flag2 Flag3 ) — auto-shifts to 1,2,4.

Hot paths, compact serialization, C interop — anywhere one int beats multiple fields.

💻 Programming Languages

const ( Flag1 = 1 << iota Flag2 Flag3 ) — auto-shifts to 1,2,4.

Hot paths, compact serialization, C interop — anywhere one int beats multiple fields.

Eight booleans in your config struct? That's a YAML nightmare waiting to happen. Bitmasks fix it with one integer and bitwise magic.

theAIcatchup Apr 10, 2026 4 min read

Bitmasks replace bool bloat with one int and bitwise ops for ultra-efficient config checks. 𝕏
Use iota + 1<< for auto-generated powers-of-two flags, dodging typos. 𝕏
Ideal for hot paths, serialization, and Unix-style options; structs better for simple startup configs. 𝕏

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#Go bitmasks #Go config patterns #Go configuration #Go programming #bitmasks #bitwise flags #bitwise operators #iota tricks

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Originally reported by Dev.to