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About the test:

Solidity Coding Onlineテストは、Solidity Programming Languageの候補者の習熟度を評価するように設計されています。このテストでは、シナリオベースのMCQを使用して、データ型、制御構造、機能とイベントの取り扱い、契約展開、デバッグ、セキュリティの考慮事項の理解などの主要な堅牢性の概念に関する候補者の知識を評価します。このテストの目的は、堅実さを使用して効率的で安全なスマートコントラクトを作成する候補者の能力を評価することを目的としています。

Covered skills:

  • 堅牢性プログラミング言語
  • スマートコントラクト
  • 暗号通貨
  • トコノミクス
  • 堅牢性データ型
  • 契約展開
  • ブロックチェーン
  • イーサリアム
  • 分散型アプリケーション
  • ブロックチェーンセキュリティ
  • 堅牢性でのエラー処理
  • 堅牢性テスト

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9 reasons why
9 reasons why

Adaface 堅牢性テスト is the most accurate way to shortlist ブロックチェーン開発者s



Reason #1

Tests for on-the-job skills

The 堅牢性テスト helps recruiters and hiring managers identify qualified candidates from a pool of resumes, and helps in taking objective hiring decisions. It reduces the administrative overhead of interviewing too many candidates and saves time by filtering out unqualified candidates at the first step of the hiring process.

The test screens for the following skills that hiring managers look for in candidates:

  • 堅牢性プログラミング言語に熟練しています
  • ブロックチェーンテクノロジーとそのアプリケーションの知識
  • スマートコントラクトの理解と堅実さでの実装
  • Ethereumとそのエコシステムに精通しています
  • 暗号通貨の概念と堅実性への影響の理解
  • 分散型アプリケーションの開発に関する知識(DAPPS)
  • 堅牢性におけるトークネミクスとトークンの作成の理解
  • ブロックチェーンセキュリティのベストプラクティスの認識
  • Solidityデータ型を効果的に操作する能力
  • エラー処理の経験と堅牢性の例外管理
  • 契約展開プロセスの理解
  • 堅牢性テスト技術に熟練しています
Reason #2

No trick questions

no trick questions

Traditional assessment tools use trick questions and puzzles for the screening, which creates a lot of frustration among candidates about having to go through irrelevant screening assessments.

View sample questions

The main reason we started Adaface is that traditional pre-employment assessment platforms are not a fair way for companies to evaluate candidates. At Adaface, our mission is to help companies find great candidates by assessing on-the-job skills required for a role.

Why we started Adaface
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Reason #3

Non-googleable questions

We have a very high focus on the quality of questions that test for on-the-job skills. Every question is non-googleable and we have a very high bar for the level of subject matter experts we onboard to create these questions. We have crawlers to check if any of the questions are leaked online. If/ when a question gets leaked, we get an alert. We change the question for you & let you know.

How we design questions

これらは、10,000以上の質問のライブラリからのわずかなサンプルです。これに関する実際の質問 堅牢性テスト グーグルできません.

🧐 Question

Medium

Delegated Contract Execution
Delegatecall
Modifiers
Contract Security
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In the Solidity code provided, there are two contracts: MainContract and HelperContract. MainContract uses delegatecall to execute a function in HelperContract. Carefully analyze the code and determine the outcome of specific operations.
 image
After deploying both contracts and setting the HelperContract address in MainContract, what will be the result of calling setHelperVars(100) from an EOA (Externally Owned Account)?
A: Only HelperContract's state is modified.
B: Only MainContract's state is modified.
C: States of both MainContract and HelperContract are modified.
D: Transaction fails due to the onlyOwner modifier in MainContract.
E: MainContract's sender and value are modified, but num remains unchanged.
F: HelperContract's sender and value are modified, but num remains unchanged.

Medium

Functions and arguments
Fallback functions
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Review the following Solidity code:
 image
We want to add a fallback function to the contract. Pick the correct fallback function and correct statements:
 image
E: Fallback function is executed if contract receives plain Ether without any data
F: Fallback function is executed if caller calls a function that is not available
G: If multiple unnamed functions are defined for a contract, the cheapest function is used as fallback function

Easy

Private and Internal
Smart Contracts
Contract Inheritance
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Review the following Solidity code:
 image
Pick the correct statements:

A: private increment function defined in contract_e is accessible in derived contract d_c but not accessible outside the derived contracts.
B: private increment function defined in contract_e is accessible only inside contract_e and not accessible to derived contracts as well.
C: internal variable str defined in contract_e is accessible in derived contract d_b but not outside the derived contracts.
D: internal variable str defined in contract_e is accessible only inside contract_e and not accessible to derived contracts as well.

Medium

Smart Contract Interaction
Contract Interaction
Gas Usage
Error Handling
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You are reviewing a set of two interacting Solidity smart contracts, `ContractA` and `ContractB`. `ContractA` calls a function in `ContractB`, which in turn updates state variables in both contracts. Your task is to determine the correct behavior and gas usage implications based on the pseudo code provided:
 image
The contracts are deployed correctly, and `ContractB` is initialized with the address of `ContractA`. Consider what happens when `incrementBoth` function of `ContractB` is called.
A: Only `ContractB`'s count is incremented; `ContractA`'s count remains unchanged.
B: Both `ContractA` and `ContractB`'s counts are incremented, with higher gas costs due to inter-contract calls.
C: Transaction fails due to lack of error handling in `ContractB`.
D: Gas optimization is achieved due to internal transaction handling.
E: `ContractA`'s count is incremented twice due to recursive call.
F: `ContractA`'s count is not incremented due to `external` keyword restriction.

Medium

51% Attacks
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A 51% attack is perhaps the most discussed threat to any public Blockchain asset. A 51% attack happens when a certain miner or mining pool, that owns more than 50% of all the network’s hashing power, acts maliciously to disturb the network’s operation.
For example: Two Bitcoin Cash mining pools, carried out a 51% attack on the Bitcoin Cash blockchain in order to stop an unknown miner from taking coins that they weren’t supposed to have access to, while the network forked.
Which of the following CAN be done by a miner employing a 51% attack?

A: Double spend their coins
B: Reverse confirmed transactions
C: Steal funds from a certain address
D: Prevent transactions from being confirmed
E: Create false transactions that never happened

Easy

Evidence
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Breed Chasing, solo engineer is planning to create new cryptocurrency, NEWCRAIGLIST and build a blockchain that facilitates buying and selling second-hand items with NEWCRAIGLIST from each other. Breed expects the platform to be used for international transactions and devised the following process:

- Before a transaction is considered complete, the purchaser must put the funds in an escrow service
- The sender must enter the courier tracking number into that same escrow
Palmart, toy store giant in US is asked by lawmakers to provide evidence that proves the store’s toys are not produced through child labour. Palmart’s toys are transferred between 7 parties between creation and placement at the store. Palmart is considering using blockchain to solve this problem. Discretion in the reading and writing of transactions is highly important to the store chain to protect its proprietary interests. Review the following possible solutions and pick the best approach that solves Palmart’s problem:
Option A:
Use a public blockchain that supports assets.
Then create a new toy asset for each item created. 
When the toy is transferred to the next party, mandate that the associated blockchain asset to be transferred to the next party's blockchain account with required metadata.
Lawmakers can now view transactions and transfers at any time.

Option B: 
Use a permissioned blockchain.
Require that every party involved in the process to host a node on the Palmart's network. 
Create a new toy asset for each item created. 
When the toy is transferred to the next party in the process, have the previous party use a web portal to initialize a chain code Smart Contract to transfer control of the asset. 
When the next party receives the asset have them use a web portal to initialize a chain code Smart Contracts to acknowledge receipt of the asset. 
Provide read-only permissions to the lawmakers so they can receive the evidence they are looking for.

Medium

Blockchain Interoperability
Smart Contract Logic
Interoperability
Decentralized Applications
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Consider a blockchain ecosystem where a decentralized application (dApp) is designed to operate across two different blockchains: Blockchain A, which uses a unique smart contract language and execution environment, and Blockchain B, which supports Ethereum Virtual Machine (EVM) compatible smart contracts. The dApp includes a cross-chain functionality where certain actions triggered in Blockchain A's smart contract result in specific operations in a smart contract on Blockchain B. The interoperability is facilitated through a decentralized oracle that verifies and relays information between the two blockchains. Given this setup, which of the following statements most accurately reflects the challenges and considerations in implementing this dApp's cross-chain functionality?
A: Cross-chain functionality cannot be achieved due to the different smart contract languages and execution environments.
B: The decentralized oracle introduces a single point of failure, compromising the security of the dApp.
C: Synchronizing state between the two blockchains is seamless and does not introduce any additional latency.
D: The dApp can maintain consistency and atomicity in transactions across the blockchains, but it faces challenges in data validation and oracle reliability.
E: Smart contract execution on Blockchain B is entirely dependent on the state of the smart contract on Blockchain A.
F: The interoperability poses no significant challenges, as EVM compatibility ensures seamless cross-chain communication.

Medium

Strategic Tokenomics
Tokenomics
Cryptocurrency Economics
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A new cryptocurrency, CryptoX, has a fixed total supply of 100 million tokens. Its initial release of 40 million tokens is distributed as follows: 10 million for development, 15 million for a decentralized autonomous organization (DAO) treasury, and 15 million for staking rewards. The remaining 60 million tokens are locked, with a scheduled release decreasing by 10% each year. CryptoX also has a deflationary mechanism where 0.1% of each transaction is burned.

During a market downturn, CryptoX's price drops by 30% in a month. Market analysis attributes this drop primarily to increased token selling by short-term holders, influenced by a broader market downturn in cryptocurrencies. CryptoX's community is considering responses to stabilize the price and reassure long-term investors. Two strategies are proposed:

1) Increase the transaction burn rate to 0.2%, hoping to reduce the circulating supply faster and create a deflationary pressure.
2) Maintain the current tokenomics, believing that the downturn is part of normal market fluctuations and that the existing mechanisms are robust enough for long-term stability.

Given the market analysis and the nature of the downturn, which strategy is more likely to effectively stabilize CryptoX’s price while maintaining long-term value?
A: Increase the transaction burn rate to 0.2%.
B: Maintain the current tokenomics without any changes.
C: Temporarily suspend the transaction burn mechanism.
D: Increase the release rate of the locked tokens.
E: Implement a dynamic burn rate that adjusts with market conditions.
F: Introduce a temporary buyback and burn program.
🧐 Question🔧 Skill

Medium

Delegated Contract Execution
Delegatecall
Modifiers
Contract Security

3 mins

Solidity
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Medium

Functions and arguments
Fallback functions

3 mins

Solidity
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Easy

Private and Internal
Smart Contracts
Contract Inheritance

2 mins

Solidity
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Medium

Smart Contract Interaction
Contract Interaction
Gas Usage
Error Handling

2 mins

Solidity
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Medium

51% Attacks

3 mins

Blockchain
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Easy

Evidence

3 mins

Blockchain
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Medium

Blockchain Interoperability
Smart Contract Logic
Interoperability
Decentralized Applications

3 mins

Blockchain
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Medium

Strategic Tokenomics
Tokenomics
Cryptocurrency Economics

2 mins

Blockchain
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🧐 Question🔧 Skill💪 Difficulty⌛ Time
Delegated Contract Execution
Delegatecall
Modifiers
Contract Security
Solidity
Medium3 mins
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Functions and arguments
Fallback functions
Solidity
Medium3 mins
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Private and Internal
Smart Contracts
Contract Inheritance
Solidity
Easy2 mins
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Smart Contract Interaction
Contract Interaction
Gas Usage
Error Handling
Solidity
Medium2 mins
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51% Attacks
Blockchain
Medium3 mins
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Evidence
Blockchain
Easy3 mins
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Blockchain Interoperability
Smart Contract Logic
Interoperability
Decentralized Applications
Blockchain
Medium3 mins
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Strategic Tokenomics
Tokenomics
Cryptocurrency Economics
Blockchain
Medium2 mins
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Reason #4

1200+ customers in 75 countries

customers in 75 countries
Brandon

Adaface を使用することで、最初の選考プロセスを 75% 以上最適化することができ、採用担当マネージャーと人材獲得チームの両方にとって貴重な時間を解放することができました。


Brandon Lee, 人々の責任者, Love, Bonito

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Reason #5

Designed for elimination, not selection

The most important thing while implementing the pre-employment 堅牢性テスト in your hiring process is that it is an elimination tool, not a selection tool. In other words: you want to use the test to eliminate the candidates who do poorly on the test, not to select the candidates who come out at the top. While they are super valuable, pre-employment tests do not paint the entire picture of a candidate’s abilities, knowledge, and motivations. Multiple easy questions are more predictive of a candidate's ability than fewer hard questions. Harder questions are often "trick" based questions, which do not provide any meaningful signal about the candidate's skillset.

Science behind Adaface tests
Reason #6

1 click candidate invites

Email invites: You can send candidates an email invite to the 堅牢性テスト from your dashboard by entering their email address.

Public link: You can create a public link for each test that you can share with candidates.

API or integrations: You can invite candidates directly from your ATS by using our pre-built integrations with popular ATS systems or building a custom integration with your in-house ATS.

invite candidates
Reason #7

Detailed scorecards & benchmarks

Reason #7

Detailed scorecards & benchmarks

Along with scorecards that report the performance of the candidate in detail, you also receive a comparative analysis against the company average and industry standards.

View sample scorecard
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Reason #8

High completion rate

Adaface tests are conversational, low-stress, and take just 25-40 mins to complete.

This is why Adaface has the highest test-completion rate (86%), which is more than 2x better than traditional assessments.

test completion rate
Reason #9

Advanced Proctoring


Learn more

About the 堅牢性テスト

Why you should use 堅牢性テスト?

The 堅牢性テスト makes use of scenario-based questions to test for on-the-job skills as opposed to theoretical knowledge, ensuring that candidates who do well on this screening test have the relavant skills. The questions are designed to covered following on-the-job aspects:

  • 堅牢性プログラミング言語能力
  • ブロックチェーンテクノロジーの理解
  • スマートコントラクトの知識
  • Ethereum Platformの経験
  • 暗号通貨の概念の理解
  • 分散型アプリケーションに精通している(DAPPS)
  • トコノミクスの理解
  • ブロックチェーンのセキュリティ原則の知識
  • 堅牢性データ型とその使用
  • 堅牢性で例外を処理する能力

Once the test is sent to a candidate, the candidate receives a link in email to take the test. For each candidate, you will receive a detailed report with skills breakdown and benchmarks to shortlist the top candidates from your pool.

What topics are covered in the 堅牢性テスト?

  • Solidity Programming Language

    Solidityは、Ethereumブロックチェーンでスマートコントラクトを作成するために特別に設計されたプログラミング言語です。開発者は、契約のルールと動作を定義することにより、複雑な分散アプリケーションを作成できます。 、それを透明で改ざんします。暗号通貨、スマートコントラクト、およびその他の分散型アプリケーションの基礎となるテクノロジーを提供します。彼らは自動的にそれらの中に定義されている規則と条件を実施し、仲介者を必要とせずに信頼できない分散型取引を可能にします。スマートコントラクト。分散型アプリケーションを作成し、ブロックチェーンで複雑な計算を実行するための安全で信頼性の高いインフラストラクチャを提供します。

  • 暗号通貨

    暗号通貨とは、暗号化を使用するデジタル通貨または仮想通貨を指します。それらは分散化され、中央当局とは独立して運営され、安全で匿名のトランザクションを可能にします。

  • Full list of covered topics

    The actual topics of the questions in the final test will depend on your job description and requirements. However, here's a list of topics you can expect the questions for 堅牢性テスト to be based on.

    堅牢性構文
    堅牢性のデータ型
    変数と定数
    関数と修飾子
    制御構造(if-else、ループ)
    堅牢性の継承とインターフェイス
    イベントとイベント処理
    構造体とマッピング
    堅牢性でのエラー処理
    ソリディティでの例外管理
    契約展開プロセス
    Ethereum Virtual Machine(EVM)
    堅牢性におけるガス最適化
    スマートコントラクトセキュリティの問題
    堅牢性単位テストフレームワーク
    トークンの作成と管理
    ERC-20およびERC-721標準
    外部契約との対話
    分散型アプリケーションアーキテクチャ
    EthereumインタラクションのためのWeb3.jsライブラリ
    堅牢性デバッグテクニック
    ブロックチェーンコンセンサスメカニズム
    堅牢性の暗号化ハッシュ関数
    プロキシ契約とアップグレード性
    堅牢性におけるロールベースのアクセス制御
    時間とタイムスタンプの処理
    堅牢性におけるオラクルの統合
    堅牢性コードの最適化
    スマートコントラクトの不変のデータ構造
    堅牢性の大規模な並列化
    ガス料金とコストの最適化を理解する
    堅牢性のエラー処理パターン
    契約アップグレード可能性戦略
    再発攻撃と予防
    フォールバック機能と自己破壊
    整数のオーバーフローとアンダーフローの防止
    アドレスタイプとその使用
    ライブラリのインポートと使用
    堅牢性コードのフォーマット規則
    堅牢性の暗号化と復号化
    スマートコントラクトの原子性
    外部ストレージ契約を拡張します
    アクセス制御とアクセス許可
    ChainLinkを使用したOracle統合
    堅牢性のガス使用量を最適化します
    契約インタラクションにイベントを使用します
    Solidity Development Tools and Ides
    トークン分布メカニズム
    堅牢性の設計パターン
    不変の契約と不変性
    パブリックおよびプライベートネットワークに契約を展開します
    ERC-20の承認と手当の処理
    堅実さのベストプラクティスとコード標準
    堅牢性での復帰の取り扱い
    エラー伝播と外部呼び出しの処理
    契約工場パターン
    堅実さでのメルクルの木を理解する
    DOS攻撃が堅牢性で攻撃を防ぐ
    ガス価格の見積もりと最適化
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What roles can I use the 堅牢性テスト for?

  • ブロックチェーン開発者
  • スマートコントラクト開発者
  • ブロックチェーンエンジニア
  • 暗号通貨開発者
  • DAPP開発者
  • ブロックチェーンコンサルタント

How is the 堅牢性テスト customized for senior candidates?

For intermediate/ experienced candidates, we customize the assessment questions to include advanced topics and increase the difficulty level of the questions. This might include adding questions on topics like

  • 契約展開の経験
  • 堅牢性テストフレームワークの習熟度
  • 高度な堅牢性プログラミング手法
  • ブロックチェーンコンセンサスメカニズムの専門知識
  • 分散財務の理解(defi)
  • ブロックチェーンの相互運用性の知識
  • 堅牢性でガスの使用を最適化する能力
  • スマートコントラクトのセキュリティ監査の経験
  • スケーラブルなダップを構築する習熟度
  • 堅牢性コードの最適化の専門知識
Singapore government logo

採用担当者は、パネル面接中に尋ねる専門的な質問を通じて、どの候補者がより良いスコアを持っているかを判断し、スコアが低い候補者と区別できると感じました。彼らです 非常に満足 Adaface のスクリーニングで最終候補者に選ばれた候補者の質を重視します。


85%
スクリーニング時間の短縮

堅牢性テスト よくある質問

複数のスキルを1つのカスタム評価に組み合わせることはできますか?

そのとおり。カスタム評価は、職務内容に基づいて設定され、指定したすべての必須スキルに関する質問が含まれます。

アンチチートまたは監督の機能はありますか?

次のアンチチート機能があります。

  • グーグル不可能な質問
  • IP監督
  • Webの提案
  • ウェブカメラの監督
  • 盗作の検出
  • 安全なブラウザ

[プロクチャリング機能](https://www.adaface.com/proctoring)の詳細をご覧ください。

テストスコアを解釈するにはどうすればよいですか?

留意すべき主なことは、評価が選択ツールではなく排除ツールであることです。スキル評価が最適化され、技術的にその役割の資格がない候補者を排除するのに役立ちます。これは、役割の最良の候補者を見つけるのに役立つために最適化されていません。したがって、評価を使用する理想的な方法は、しきい値スコア(通常は55%、ベンチマークを支援します)を決定し、インタビューの次のラウンドのしきい値を超えてスコアを上回るすべての候補者を招待することです。

このテストを使用できますか?

各ADAFACE評価は、職務記述書/理想的な候補者のペルソナにカスタマイズされます(当社の主題の専門家は、10000以上の質問のライブラリからあなたの評価に適切な質問を選択します)。この評価は、あらゆる経験レベルでカスタマイズできます。

すべての候補者は同じ質問を受け取りますか?

私は候補者です。練習テストを試すことはできますか?

いいえ。残念ながら、現時点では練習テストをサポートしていません。ただし、[サンプルの質問](https://www.adaface.com/questions)を使用するには、練習できます。

このテストを使用するコストはいくらですか?

無料トライアルを受けることはできますか?

私はちょうど有料プランに移りました。カスタム評価をリクエストするにはどうすればよいですか?

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Join 1200+ companies in 75+ countries.
今日、最も候補者のフレンドリーなスキル評価ツールをお試しください。
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