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dr. mia von steinkirch, phd 2023-02-17 18:22:21 -08:00 • committed by GitHub
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## calldata
<br>
### tl; dr
<br>
* calldata is the encoded parameter(s) sent on functions by smart contracts to the evm (for example, through `abi.econde()`,`abi.econcdeWithSelector() for a particular interfaced function, or `abi.encodePacked()` for efficient dynamic variables).
* `selector()` generates the 4-bytes representing the method in the interface: this is how the evm knows which function is being interacted.
* each piece of calldata is 32 bytes long (64 chars), where 20 hex == 32-bytes
* types:
- static variables: the encoded representation of `uint`, `address`, `bool`, `bytes`, `tuples`
- dynamics variables: non-fixed-size types: `bytes`, `string`, dynamic and fixed arrays `<T>[]`
<br>
---
### resources