Rust Smart Contracts on NEAR — Lesson 10 🦀

HashMap
What should we cover next? Drop it in the comments ✍️

Need fast key → value lookups? Use HashMap. In this lesson we model DeFi/NFT data, show safe updates, and when to switch to NEAR SDK’s persistent maps 💥

✏️ What you’ll learn:
🔴 Basics — HashMap<K, V>, new(), insert(), get(), contains_key()
🔴 Entry API — entry().or_insert() for clean increments/updates
🔴 Mutation + Option — remove(), retain(), unwrap_or, if let, ?
🔴 Safety — chunk work for gas, avoid unbounded loops; HashMap (in-call) vs UnorderedMap/LookupMap (persisted)

📺 Watch the lesson here
👨‍💻 Code examples

🔖 Stay tuned — more lessons on efficient and secure NEAR smart contract development are on the way.

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Don’t break walls — break barriers ☕️

NEAR Docs: short, clear, to the point. Start in minutes.
➡️ https://docs.near.org/

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Rust Smart Contracts on NEAR — The Last Lesson 🦀

Vectors

Need ordered, growable lists? Use Vec<T>. In this lesson we model real dApp data, walk through clean update patterns, and note when to switch to NEAR SDK’s persistent collections 💥

✏️ What you’ll learn:
🔴 Basics — Vec<T>, Vec::new(), vec![], push(), indexing, .len()
🔴 Advanced ops — pop(), remove(i), insert(i, v), retain(), position(), sum()
🔴 Safety & perf — preallocate with with_capacity(), avoid unbounded loops, chunk work for gas; Vec (in-call) vs near_sdk::collections::Vector (persisted)

📺 Watch the lesson here
👨‍💻 Code examples

🔖 Final episode here, not the end of the journey: a new playlist launches soon.

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Tell Us What Worked (and What Didn’t) 🦀

We’re collecting feedback to shape the next series: Beginner (NEAR SDK, accounts, tokens, testing, and more) 🗯

How to help
🟢 Fill the feedback form
🟢 Tell us what was clear, what wasn’t, and what topics you want next

📺 Check out the playlist here
⏳ Deadline: 6.09, 23:59 CET

🔖 To help us raise the bar, we’ll reward the three most valuable feedback contributors: 1st — 15 $NEAR, 2nd — 10 $NEAR, 3rd — 5 $NEAR

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✉️ NEAR Dev News #77 is out!

👩‍💻 THIS WEEK’S FOCUS: Bitte AI
Intent → plan → one confirm → tx. Drop a chat agent into your dApp and let users swap, stake, or vote without bridge spaghetti.

🖥 Also inside:
🔶 NEARN hits $1.26M earned — 18 open bounties live
🔶 $250 bounty — Cooked Generation NFT traits
🔶 RPC Access Keys docs refreshed
🔶 Rust lessons: Match & Enums + Arrays
🔶 Launch your own EVM chain in ~5 min
🔶 NEAR mainnet → 9 shards
🔶 NEAR Protocol Rewards Q3’25 cohort
🔶 Illia’s Attention #2

💥 From intents to infra, NEAR is where builders ship.

🔗 Read + subscribe: http://dev.near.org/newsletter
🔖 Available freelancing opportunities here

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When devs cook, DAOs eat well 🍽

NEAR Treasury — Payments UX upgrade:
🔷 Filters: Creation Date, Status, Recipient, Token, Created by, Approver, My Vote Status
🔷 Keyword search: ID, Title, Summary
🔷 Export: filtered results to CSV

Same experience is already live on Delegations. Less scrolling, faster reviews 🗯

🖥 Payments overview
➡️ Try NEAR Treasury now

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🌟 NEAR Town Hall: September Edition

Join us for the next NEAR Town Hall featuring:
• Illia Polosukhin
• More Markets
• Sproutly
• Omega Network
• Valhalla Security

📌 Get foundation updates, ecosystem intel, and live demos from the builders shaping NEAR.

🗓 September 4 | 3 PM UTC

➡️ Set Reminder on YouTube | RSVP on Luma

POV: Ryan Gosling watched our playlist and…

... filled out the feedback form. You in? 😎

Literally me. Literally now. Feedback form.

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NEAR x Aptos x Shelby 🫰

Chain abstraction, leveled up: one-click swaps to Aptos via NEAR Intents (BTC/ETH/XRP ➡️ APT/USDT) + decentralized hot storage for AI & real-time apps with Shelby 🤝

🔗 Read more on the blog

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🚨 We are looking for the best who will take 30 $NEAR

You got it right, the deadline has been extended until 8.09 23:59 CET, which means you still have time to watch (if you haven't done so before), fill out the form and get your reward.

The entire playlist will take you an hour, this is a good opportunity to refresh your knowledge of Rust Smart Contracts 🦀

🔗 Playlist
🔗 Feedback form

Your quality feedback = better lessons. Thanks ahead of time ❤️

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Simple DAO Frontend — shipped 👨‍💻

We’re open-sourcing a lightweight DAO frontend for NEAR. It focuses on the basics — creating proposals and voting — and is easy to deploy on GitHub Pages. Ideal for hackathons and quick PoCs.

🔗 GitHub
We’d love feedback and contributions! ❤️

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Found and rewarded 🤑

The feedback was so good we added two more winners 🗯

🏆 Winners:
⚪️ @svntax_dev (15 NEAR)
⚪️ @dr3y_x (10 NEAR)
⚪️ @foxreymann (5 NEAR)
⚪️ @crocps2 (2.5 NEAR)
⚪️ @musashi_hp (2.5 NEAR)

Thanks to all participants! Your notes are already in our update plan ❤️

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New RFP from the NEAR Infrastructure Committee ✨

TEE-secured Price Oracle
⏳ Deadline: 24 days left

The goal: build and maintain a Price Oracle on NEAR powered by TEEs rather than crypto-economic security.

Beyond serving as critical infra for the ecosystem, this oracle will also be a real-world product leveraging the Shade Agent Framework 👍

✍️ Full TEE-secured Oracle RFP

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Token launches should feel like Verstappen 🏎

TU TU TU DU and claimed ✔️

That’s why we’re funding a Fungible Tokens Claiming Service that can hit 100 tx/s, survive heavy load, and be ready for any launch.

Stack: Rust or TypeScript
Deliverables: API + benchmarks + docs
Reward: 1,000 $NEAR

⏳ 32 days left — claim it before someone else does!
🔗 Details & Submission

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Kotlin builders, this one’s for you 😁

We’re looking for someone to ship an automated Kotlin RPC client for NEAR — a missing piece for mobile development 📱

🏆 Bounty: 6,000 USDC
⏳ Deadline: 27 days left
🔗 Details & Submission

Expect codegen, packages, automation, and docs — open-sourced for the community 📖

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Break the NEAR Intents, get paid 🪙

Targets: theft/loss, unauthorized/manipulated tx, price/fee/balance bugs, execution-flow or crypto flaws in the NEAR Intents Verifier 🗯

⚪️ Rewards up to $500k
⚪️ Test on private testnet only
⚪️ Report via HackenProof within 24h of discovery
⚪️ Payouts may be in $NEAR (1y vest)

🔗 Docs: Intents + cargo
🔗 Details & Submission

Good hunting 👨‍💻

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Swift builders, this one’s for you 😁

We’re funding the automation of a type-safe Swift RPC client for NEAR — a missing piece for native iOS development 📱

🏆 Bounty: 6,000 USDC
⏳ Deadline: 25 days left
🔗 Details & Submission

Expect codegen, Swift packages, CI/CD automation, and docs — fully open-sourced for the community 📖

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✉️ NEAR Dev News #78 is out!

📌 THIS WEEK’S FOCUS: Memecoin Season
Markets run on attention — and right now, memes run the show 🪙🐸

🖥 Also inside:
🔴 NEARN hits $1.28M earned — 21 open bounties live
🔴 25 $NEAR bounty — make a TikTok about NEAR
🔴 NEAR Treasury — faster payments UX
🔴 Rust lessons: HashMap & Vector wrap up Intro track
🔴 HOT Connect + NEAR Intents
🔴 Call for NEP reviewers
🔴 DeFAI — Fraction AI launches agent prediction markets
🔴 TRON x NEAR — one-confirm checkout via Intents

💥 Attention is the fuel. NEAR is the engine.

🔗 Read + subscribe: http://dev.near.org/newsletter
🔖 Available freelancing opportunities here

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Your next 20 minutes, well spent ☕️

Ship a NEAR + Next.js dApp with MetaMask & NEAR Wallet — step by step. Try it 👇

📺 dApp in 20 minutes
👨‍💻 Code examples

Stuck anywhere? Ask in chat — builders help builders 🤝

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