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CHALLENGE

function processUserData(data) {
try {
if (!data) {
throw new Error('No data provided');
}

if (!data.name) {
throw new TypeError('Name is required');
}

return { success: true, user: data.name };
} catch (err) {
if (err instanceof TypeError) {
return { success: false, reason: 'validation-failed' };
}
return { success: false, reason: 'unknown-error' };
}
}

console.log(processUserData({}));
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CHALLENGE

const cache = new WeakMap();

function expensiveOperation(obj) {
if (cache.has(obj)) {
console.log('Cache hit!');
return cache.get(obj);
}

console.log('Computing result...');
const result = obj.value * 2;
cache.set(obj, result);
return result;
}

const user = { value: 42 };
expensiveOperation(user);
expensiveOperation(user);
expensiveOperation({ value: 42 });
✌️ jsonrepair: Repair Invalid JSON Documents

This has lots of possible use cases, including dealing with weird JSON coming back from LLMs or non-compliant JSON spat out by poorly built software. You can use it from Node, as a CLI tool, or try a basic version online.

Jos de Jong
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CHALLENGE

async function fetchData() {
return 'Data loaded';
}

async function processData() {
console.log('Starting...');
try {
const result = fetchData();
console.log(result);
console.log(await result);
return 'Processing complete';
} catch (error) {
return 'Error occurred';
} finally {
console.log('Cleanup');
}
}

processData().then(result => console.log(result));
🀩 Bruno: An IDE for Exploring and Testing HTTP APIs

An open source (though a commercial version is available) Node and Electron-based desktop app for crafting and testing HTTP requests, complex and simple. Think of it as a lightweight alternative to something like Postman.

Anoop M D, Anusree P S and Contributors
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2025/07/11 18:14:34
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