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Example-Solidity-Sprint

Getting Started

To build, test, and deploy the example smart contract, we will use Hardhat, an Ethereum development environment. Make sure you have npm installed before executing the following commands.

First clone the repository and enter the directory.

$ git clone https://github.com/404-DAO/Example-Solidity-Sprint.git
$ cd "Example-Solidity-Sprint"

You have your choice of development frameworks for this sprint. The recommended tools are either Hardhat or Foundry.

Foundry

Foundry is a command-line tool independent of NPM, meaning you must install it individually on your machine. Instructions on how to do so can be found on their website getFoundry.sh

curl -L https://foundry.paradigm.xyz | bash

It contains tools you may find useful during this challenge including forge - A testing-framework for smart-contracts in Solidity cast - A suite of command-line tools for common things in solidity anvil - a chain-forking CLI-tool similar to ganache

We recommend forge and cast due to their fast runtime and excellent documentation. Once foundry is installed, no further configuration should be necesarry. Any code found in either contracts, test, or script will be compiled by using the forge build command.

Foundry has its own scripting and deployment library as well which you can read up on

Hardhat

Install the necessary dependencies

$ npm i

Compile the ExampleSoliditySprint2022 contract

$ npx hardhat compile

Run associated tests

$ npx hardhat test

Deploy to Goerli

$ npx hardhat run scripts/deploy.js --network Goerli

To deploy your contract or transaction you will need to place your private key in a .env file alongside your hardhat.config.js file under the variable GOERLI_PRIVATE_KEY=[key]

Preparation

IF YOU NEED GOERLI ETH, ASK IN THE DISCORD or visit this link

Play around with the contract using Etherscan or locally by running tests.

Try to complete f1. If you're testing locally using hardhat, start here.

Note: Each transaction sent to the network incurs gas cost, consider this when completing f1.

Educational Materials

About

No description, website, or topics provided.

Resources

Readme
MIT license
Activity
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, 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
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function addCopyButtons() {
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})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

Skip to content
BranchesTags
Repository files navigation
Example-Solidity-Sprint
Getting Started
To build, test, and deploy the example smart contract, we will use Hardhat, an Ethereum development environment. Make sure you have npm installed before executing the following commands.
First clone the repository and enter the directory.
$ git clone https://github.com/404-DAO/Example-Solidity-Sprint.git
$ cd "Example-Solidity-Sprint"

You have your choice of development frameworks for this sprint. The recommended tools are either Hardhat or Foundry.
Foundry
Foundry is a command-line tool independent of NPM, meaning you must install it individually on your machine. Instructions on how to do so can be found
on their website getFoundry.sh
curl -L https://foundry.paradigm.xyz | bash
It contains tools you may find useful during this challenge including
forge - A testing-framework for smart-contracts in Solidity
cast - A suite of command-line tools for common things in solidity
anvil - a chain-forking CLI-tool similar to ganache
We recommend forge and cast due to their fast runtime and excellent documentation. Once foundry is installed, no further configuration should be necesarry. Any code found in either contracts, test, or script will be compiled by using the forge build command.
Foundry has its own scripting and deployment library as well which you can read up on
Hardhat
Install the necessary dependencies
$ npm i

Compile the ExampleSoliditySprint2022 contract
$ npx hardhat compile

Run associated tests
$ npx hardhat test

Deploy to Goerli
$ npx hardhat run scripts/deploy.js --network Goerli

To deploy your contract or transaction you will need to place your private key in a .env file alongside your hardhat.config.js file under the variable GOERLI_PRIVATE_KEY=[key]
Preparation
IF YOU NEED GOERLI ETH, ASK IN THE DISCORD or visit this link
Play around with the contract using Etherscan or locally by running tests.
Try to complete f1. If you're testing locally using hardhat, start here.
Note: Each transaction sent to the network incurs gas cost, consider this when completing f1.
Educational Materials
About
No description, website, or topics provided.
Resources
Readme
MIT license
Activity
Custom properties
Stars
0 stars
Watchers
0 watching
Forks
5 forks
Report repository
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
(function() {
var style = document.createElement('style');
style.textContent = '
.markdown-body {
color-scheme: dark light;
}
.markdown-body pre { background: #161b22 !important; }
.markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }
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.markdown-body img { background: #0d1117; }
.markdown-body blockquote { border-left-color: #8b949e; }
.markdown-body hr { border-color: #30363d; }
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document.head.appendChild(style);
})();
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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BranchesTags
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Example-Solidity-Sprint
Getting Started
To build, test, and deploy the example smart contract, we will use Hardhat, an Ethereum development environment. Make sure you have npm installed before executing the following commands.
First clone the repository and enter the directory.
$ git clone https://github.com/404-DAO/Example-Solidity-Sprint.git
$ cd "Example-Solidity-Sprint"

You have your choice of development frameworks for this sprint. The recommended tools are either Hardhat or Foundry.
Foundry
Foundry is a command-line tool independent of NPM, meaning you must install it individually on your machine. Instructions on how to do so can be found
on their website getFoundry.sh
curl -L https://foundry.paradigm.xyz | bash
It contains tools you may find useful during this challenge including
forge - A testing-framework for smart-contracts in Solidity
cast - A suite of command-line tools for common things in solidity
anvil - a chain-forking CLI-tool similar to ganache
We recommend forge and cast due to their fast runtime and excellent documentation. Once foundry is installed, no further configuration should be necesarry. Any code found in either contracts, test, or script will be compiled by using the forge build command.
Foundry has its own scripting and deployment library as well which you can read up on
Hardhat
Install the necessary dependencies
$ npm i

Compile the ExampleSoliditySprint2022 contract
$ npx hardhat compile

Run associated tests
$ npx hardhat test

Deploy to Goerli
$ npx hardhat run scripts/deploy.js --network Goerli

To deploy your contract or transaction you will need to place your private key in a .env file alongside your hardhat.config.js file under the variable GOERLI_PRIVATE_KEY=[key]
Preparation
IF YOU NEED GOERLI ETH, ASK IN THE DISCORD or visit this link
Play around with the contract using Etherscan or locally by running tests.
Try to complete f1. If you're testing locally using hardhat, start here.
Note: Each transaction sent to the network incurs gas cost, consider this when completing f1.
Educational Materials
About
No description, website, or topics provided.
Resources
Readme
MIT license
Activity
Custom properties
Stars
0 stars
Watchers
0 watching
Forks
5 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
if (q) {
terms = q.split(/\s+/).filter(function(t) { return t.length > 2; });
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if (terms.length === 0) return;
var style = document.createElement('style');
style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
document.head.appendChild(style);
function highlight(node) {
if (node.nodeType === 3) { // text node
var text = node.textContent;
var found = false;
terms.forEach(function(term) {
var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi');
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found = true;
var frag = document.createDocumentFragment();
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var span = document.createElement('span');
span.className = 'userscript-highlight';
span.textContent = part;
frag.appendChild(span);
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node.parentNode.replaceChild(frag, node);
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} else if (node.nodeType === 1 && node.childNodes) { // element
var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];
if (!skipTags.includes(node.tagName)) {
Array.from(node.childNodes).forEach(highlight);
}
}
}
highlight(document.body);
// Re-highlight on dynamic content
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1 || node.nodeType === 3) highlight(node);
});
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observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
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Example-Solidity-Sprint
Getting Started
To build, test, and deploy the example smart contract, we will use Hardhat, an Ethereum development environment. Make sure you have npm installed before executing the following commands.
First clone the repository and enter the directory.
$ git clone https://github.com/404-DAO/Example-Solidity-Sprint.git
$ cd "Example-Solidity-Sprint"

You have your choice of development frameworks for this sprint. The recommended tools are either Hardhat or Foundry.
Foundry
Foundry is a command-line tool independent of NPM, meaning you must install it individually on your machine. Instructions on how to do so can be found
on their website getFoundry.sh
curl -L https://foundry.paradigm.xyz | bash
It contains tools you may find useful during this challenge including
forge - A testing-framework for smart-contracts in Solidity
cast - A suite of command-line tools for common things in solidity
anvil - a chain-forking CLI-tool similar to ganache
We recommend forge and cast due to their fast runtime and excellent documentation. Once foundry is installed, no further configuration should be necesarry. Any code found in either contracts, test, or script will be compiled by using the forge build command.
Foundry has its own scripting and deployment library as well which you can read up on
Hardhat
Install the necessary dependencies
$ npm i

Compile the ExampleSoliditySprint2022 contract
$ npx hardhat compile

Run associated tests
$ npx hardhat test

Deploy to Goerli
$ npx hardhat run scripts/deploy.js --network Goerli

To deploy your contract or transaction you will need to place your private key in a .env file alongside your hardhat.config.js file under the variable GOERLI_PRIVATE_KEY=[key]
Preparation
IF YOU NEED GOERLI ETH, ASK IN THE DISCORD or visit this link
Play around with the contract using Etherscan or locally by running tests.
Try to complete f1. If you're testing locally using hardhat, start here.
Note: Each transaction sent to the network incurs gas cost, consider this when completing f1.
Educational Materials
About
No description, website, or topics provided.
Resources
Readme
MIT license
Activity
Custom properties
Stars
0 stars
Watchers
0 watching
Forks
5 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
BranchesTags
Repository files navigation
Example-Solidity-Sprint
Getting Started
To build, test, and deploy the example smart contract, we will use Hardhat, an Ethereum development environment. Make sure you have npm installed before executing the following commands.
First clone the repository and enter the directory.
$ git clone https://github.com/404-DAO/Example-Solidity-Sprint.git
$ cd "Example-Solidity-Sprint"

You have your choice of development frameworks for this sprint. The recommended tools are either Hardhat or Foundry.
Foundry
Foundry is a command-line tool independent of NPM, meaning you must install it individually on your machine. Instructions on how to do so can be found
on their website getFoundry.sh
curl -L https://foundry.paradigm.xyz | bash
It contains tools you may find useful during this challenge including
forge - A testing-framework for smart-contracts in Solidity
cast - A suite of command-line tools for common things in solidity
anvil - a chain-forking CLI-tool similar to ganache
We recommend forge and cast due to their fast runtime and excellent documentation. Once foundry is installed, no further configuration should be necesarry. Any code found in either contracts, test, or script will be compiled by using the forge build command.
Foundry has its own scripting and deployment library as well which you can read up on
Hardhat
Install the necessary dependencies
$ npm i

Compile the ExampleSoliditySprint2022 contract
$ npx hardhat compile

Run associated tests
$ npx hardhat test

Deploy to Goerli
$ npx hardhat run scripts/deploy.js --network Goerli

To deploy your contract or transaction you will need to place your private key in a .env file alongside your hardhat.config.js file under the variable GOERLI_PRIVATE_KEY=[key]
Preparation
IF YOU NEED GOERLI ETH, ASK IN THE DISCORD or visit this link
Play around with the contract using Etherscan or locally by running tests.
Try to complete f1. If you're testing locally using hardhat, start here.
Note: Each transaction sent to the network incurs gas cost, consider this when completing f1.
Educational Materials
About
No description, website, or topics provided.
Resources
Readme
MIT license
Activity
Custom properties
Stars
0 stars
Watchers
0 watching
Forks
5 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
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}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Example-Solidity-Sprint
Getting Started
To build, test, and deploy the example smart contract, we will use Hardhat, an Ethereum development environment. Make sure you have npm installed before executing the following commands.
First clone the repository and enter the directory.
$ git clone https://github.com/404-DAO/Example-Solidity-Sprint.git
$ cd "Example-Solidity-Sprint"

You have your choice of development frameworks for this sprint. The recommended tools are either Hardhat or Foundry.
Foundry
Foundry is a command-line tool independent of NPM, meaning you must install it individually on your machine. Instructions on how to do so can be found
on their website getFoundry.sh
curl -L https://foundry.paradigm.xyz | bash
It contains tools you may find useful during this challenge including
forge - A testing-framework for smart-contracts in Solidity
cast - A suite of command-line tools for common things in solidity
anvil - a chain-forking CLI-tool similar to ganache
We recommend forge and cast due to their fast runtime and excellent documentation. Once foundry is installed, no further configuration should be necesarry. Any code found in either contracts, test, or script will be compiled by using the forge build command.
Foundry has its own scripting and deployment library as well which you can read up on
Hardhat
Install the necessary dependencies
$ npm i

Compile the ExampleSoliditySprint2022 contract
$ npx hardhat compile

Run associated tests
$ npx hardhat test

Deploy to Goerli
$ npx hardhat run scripts/deploy.js --network Goerli

To deploy your contract or transaction you will need to place your private key in a .env file alongside your hardhat.config.js file under the variable GOERLI_PRIVATE_KEY=[key]
Preparation
IF YOU NEED GOERLI ETH, ASK IN THE DISCORD or visit this link
Play around with the contract using Etherscan or locally by running tests.
Try to complete f1. If you're testing locally using hardhat, start here.
Note: Each transaction sent to the network incurs gas cost, consider this when completing f1.
Educational Materials
About
No description, website, or topics provided.
Resources
Readme
MIT license
Activity
Custom properties
Stars
0 stars
Watchers
0 watching
Forks
5 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Example-Solidity-Sprint
Getting Started
To build, test, and deploy the example smart contract, we will use Hardhat, an Ethereum development environment. Make sure you have npm installed before executing the following commands.
First clone the repository and enter the directory.
$ git clone https://github.com/404-DAO/Example-Solidity-Sprint.git
$ cd "Example-Solidity-Sprint"

You have your choice of development frameworks for this sprint. The recommended tools are either Hardhat or Foundry.
Foundry
Foundry is a command-line tool independent of NPM, meaning you must install it individually on your machine. Instructions on how to do so can be found
on their website getFoundry.sh
curl -L https://foundry.paradigm.xyz | bash
It contains tools you may find useful during this challenge including
forge - A testing-framework for smart-contracts in Solidity
cast - A suite of command-line tools for common things in solidity
anvil - a chain-forking CLI-tool similar to ganache
We recommend forge and cast due to their fast runtime and excellent documentation. Once foundry is installed, no further configuration should be necesarry. Any code found in either contracts, test, or script will be compiled by using the forge build command.
Foundry has its own scripting and deployment library as well which you can read up on
Hardhat
Install the necessary dependencies
$ npm i

Compile the ExampleSoliditySprint2022 contract
$ npx hardhat compile

Run associated tests
$ npx hardhat test

Deploy to Goerli
$ npx hardhat run scripts/deploy.js --network Goerli

To deploy your contract or transaction you will need to place your private key in a .env file alongside your hardhat.config.js file under the variable GOERLI_PRIVATE_KEY=[key]
Preparation
IF YOU NEED GOERLI ETH, ASK IN THE DISCORD or visit this link
Play around with the contract using Etherscan or locally by running tests.
Try to complete f1. If you're testing locally using hardhat, start here.
Note: Each transaction sent to the network incurs gas cost, consider this when completing f1.
Educational Materials
About
No description, website, or topics provided.
Resources
Readme
MIT license
Activity
Custom properties
Stars
0 stars
Watchers
0 watching
Forks
5 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
// Toggle with Alt+Shift+D
document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

Skip to content
BranchesTags
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Example-Solidity-Sprint
Getting Started
To build, test, and deploy the example smart contract, we will use Hardhat, an Ethereum development environment. Make sure you have npm installed before executing the following commands.
First clone the repository and enter the directory.
$ git clone https://github.com/404-DAO/Example-Solidity-Sprint.git
$ cd "Example-Solidity-Sprint"

You have your choice of development frameworks for this sprint. The recommended tools are either Hardhat or Foundry.
Foundry
Foundry is a command-line tool independent of NPM, meaning you must install it individually on your machine. Instructions on how to do so can be found
on their website getFoundry.sh
curl -L https://foundry.paradigm.xyz | bash
It contains tools you may find useful during this challenge including
forge - A testing-framework for smart-contracts in Solidity
cast - A suite of command-line tools for common things in solidity
anvil - a chain-forking CLI-tool similar to ganache
We recommend forge and cast due to their fast runtime and excellent documentation. Once foundry is installed, no further configuration should be necesarry. Any code found in either contracts, test, or script will be compiled by using the forge build command.
Foundry has its own scripting and deployment library as well which you can read up on
Hardhat
Install the necessary dependencies
$ npm i

Compile the ExampleSoliditySprint2022 contract
$ npx hardhat compile

Run associated tests
$ npx hardhat test

Deploy to Goerli
$ npx hardhat run scripts/deploy.js --network Goerli

To deploy your contract or transaction you will need to place your private key in a .env file alongside your hardhat.config.js file under the variable GOERLI_PRIVATE_KEY=[key]
Preparation
IF YOU NEED GOERLI ETH, ASK IN THE DISCORD or visit this link
Play around with the contract using Etherscan or locally by running tests.
Try to complete f1. If you're testing locally using hardhat, start here.
Note: Each transaction sent to the network incurs gas cost, consider this when completing f1.
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