Dynamic ABI and nested layouts
Begin with “Head and tail encoding” and work toward “Nested ABI challenge set”. Each available lesson includes a visual explanation and a quick knowledge check.
Read in order or choose a topic below. Completion marks stay in this browser. All 20 lessons in this track are available.
- 01
Head and tail encoding
Keep fixed-width heads separate from variable-sized payloads.
5 MIN READ - 02
Understand relative offsets
An offset is useful only when you know its starting point.
5 MIN READ - 03
Encode one string
A single dynamic argument still has an offset word.
5 MIN READ - 04
Count UTF-8 bytes correctly
Visible characters and encoded bytes are different counts.
5 MIN READ - 05
Padding dynamic bytes
The payload is right-padded while its length remains exact.
5 MIN READ - 06
Encode two dynamic arguments
Later tails begin after the full earlier tail.
5 MIN READ - 07
Encode a uint256 array
Dynamic arrays begin their tail with an element count.
5 MIN READ - 08
Encode a string array
Element offsets use the array element tuple as their base.
5 MIN READ - 09
Fixed arrays of dynamic values
A fixed element count can still contain dynamic content.
5 MIN READ - 10
Dynamic arrays of static tuples
The array is dynamic even when every tuple element has fixed width.
5 MIN READ - 11
Tuples containing strings
One dynamic component makes the tuple dynamic.
5 MIN READ - 12
Nested tuple offset bases
Draw a separate origin for every nested dynamic tuple.
5 MIN READ - 13
Nested dynamic array walkthrough
Each dynamic array layer has a count and its own element region.
5 MIN READ - 14
Empty strings and empty arrays
Empty content still has a valid dynamic encoding.
5 MIN READ - 15
Malformed offsets and decoding failures
A word that looks like an offset can point outside the supplied data.
5 MIN READ - 16
Bounds checks in ABI decoders
Every length calculation must stay inside the available input.
5 MIN READ - 17
ABI coder version behavior
Compiler generation and decoder checks are separate from the basic layout.
5 MIN READ - 18
Cross-language encoding consistency
Typed values should produce the same standard bytes in different implementations.
5 MIN READ - 19
Build a dynamic encoding trace
Annotate byte positions before trying to memorize a long hex string.
5 MIN READ - 20
Nested ABI challenge set
Resolve a nested layout and justify every offset base.
5 MIN READ