Yield farming concepts in Blockchain / Solidity - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a function that returns the annual percentage yield (APY) given a simple interest rate.

Blockchain / Solidity

function calculateAPY(rate) {
  return (1 + [1]) ** 1 - 1;
}

Drag options to blanks, or click blank then click option'

Arate

Brate * 100

Crate / 100

Drate + 1

Attempts:

3 left

💡 Hint

Common Mistakes

Using the rate directly without dividing by 100 causes wrong APY calculation.

The interest rate must be converted from a percentage to a decimal by dividing by 100 before calculating APY.

2fill in blank

medium

Complete the code to calculate the total rewards earned by multiplying staked tokens by the reward rate.

Blockchain / Solidity

function calculateRewards(stakedTokens, rewardRate) {
  return stakedTokens [1] rewardRate;
}

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A/

B+

C-

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using addition or subtraction instead of multiplication.

Rewards are calculated by multiplying the amount staked by the reward rate.

3fill in blank

hard

Fix the error in the code that calculates compounded yield over multiple periods.

Blockchain / Solidity

function compoundedYield(principal, rate, periods) {
  return principal * (1 + [1]) ** periods;
}

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Arate / 100

Brate * 100

Crate + 1

Drate - 1

Attempts:

3 left

💡 Hint

Common Mistakes

Using the rate directly without conversion causes incorrect yield.

The rate must be converted from a percentage to a decimal by dividing by 100 before compounding.

4fill in blank

hard

Fill both blanks to create a filtered object that maps token names to their staked amounts if the amount is greater than zero.

Blockchain / Solidity

const stakedTokens = Object.fromEntries(Object.entries(tokens).filter(([[1], [2]]) => [2] > 0 ));

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Atoken

Bamount

Ctokens

Dtoken.toUpperCase()

Attempts:

3 left

💡 Hint

Common Mistakes

Using the whole tokens object as key or value.

The object maps each token name to its staked amount, filtering only positive amounts.

5fill in blank

hard

Fill all three blanks to create a function that returns a filtered object of tokens with APY greater than a threshold.

Blockchain / Solidity

function filterHighAPY(tokens, threshold) {
  return Object.fromEntries(Object.entries(tokens).filter(([[1], [2]]) => [3] > threshold));
}

Drag options to blanks, or click blank then click option'

Atoken

Bapy

Camount

Drate

Attempts:

3 left

💡 Hint

Common Mistakes

Using amount or rate instead of apy for filtering.

The function filters tokens by checking if their APY is greater than the threshold.