Yashotantra Academy logo
← Vyper theorytheory 0/50 · 0%
level 1
Curious · 0 XP
streak
0d
perfect
0
badges
0

100 XP to Apprentice

Functions · medium

28. Internal helper functions

Factoring shared logic without inheritance.

1 min read3 questionsup to 50 XPtopic 28/50

Read in another language

AI translates the explanation and quiz text while preserving code and answer scoring.

Since Vyper has no inheritance, code reuse within a contract happens through `@internal` helper functions rather than base contracts. This keeps every contract self-contained and readable without following a chain of `is` relationships.

@internal
def _safe_transfer(token: address, to: address, amount: uint256):
    success: bool = ERC20(token).transfer(to, amount)
    assert success, "transfer failed"

@external
def payout(token: address, to: address, amount: uint256):
    self._safe_transfer(token, to, amount)

Internal functions can call other internal functions, take any type Vyper supports, and are inlined-away at the bytecode level with no runtime dispatch overhead compared to an external call.

How to study this topic

  1. 1. Read the explanation once end to end, skipping the code.
  2. 2. Re-read the code snippets and say out loud what each line does.
  3. 3. Answer the quiz without scrolling back — that is the real check.
  4. 4. Read every explanation, even for the answers you got right.

Scoring

  • · Up to 30 XP from quiz accuracy.
  • · +15 XP for a perfect first attempt.
  • · +5 XP while a 3-day streak is running.
  • · 75% or higher marks the topic complete.

Check your understanding

  1. 1. How does Vyper achieve code reuse without inheritance?

  2. 2. Can internal functions call other internal functions?

  3. 3. Why does Vyper avoid inheritance?

Badges

First light
Pass your first topic
Sharp shooter
3 perfect first-try quizzes
On a roll
Study 3 days in a row
Week warrior
Study 7 days in a row
Grinder
Earn 500 XP
Deep diver
Earn 1500 XP