Data Location.md

55 - Data Location

Reference Types & Data Location: Every reference type has an additional annotation — the data location where it is stored. There are three data locations: memory, storage and calldata. 

1. memory: whose lifetime is limited to an external function call

2. storage: whose lifetime is limited to the lifetime of a contract and the location where the state variables are stored

3. calldata: which is a non-modifiable, non-persistent area where function arguments are stored and behaves mostly like memory. It is required for parameters of external functions but can also be used for other variables.

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Slide Screenshot

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Slide Deck

• Reference Types -> Data Location Annotation
• memory, storage, calldata
  • memory: function
  • storage: contract
  • calldata: non-modifiable, non-persistent, external fn parameters
• Impact -> Scope
• Security: Persistence

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References

• Youtube Reference

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Tags

Calldata, Memory, Storage