A fantastic community maintained resource that presents a category-based way to find packages and libraries. For example, you can check out HTTP frameworks, browser testing, query builders, and more. You can compare libraries in various ways, see their download count, or edit/submit listings yourself.
Maxim Orlov
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CHALLENGE
const weakMap = new WeakMap();
const obj1 = {};
const obj2 = {};
weakMap.set(obj1, 'value1');
weakMap.set(obj2, 'value2');
const arr = [obj1, obj2];
const result = arr.map(obj => weakMap.get(obj)).join(', ');
console.log(result);
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What is the output?
Anonymous Quiz
12%
Error
17%
"value1, undefined"
20%
"undefined, undefined"
50%
"value1, value2"
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CHALLENGE
function* idGenerator() {
let id = 1;
while (true) {
yield id++;
}
}
const gen = idGenerator();
const weakMap = new WeakMap();
const objs = [{}, {}, {}];
objs.forEach(obj => weakMap.set(obj, gen.next().value));
const result = objs.map(obj => weakMap.get(obj)).filter(id => id % 2 === 0);
console.log(result);
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A simple abstraction for Node.js worker_threads, allowing you to create and share a Map (hash table) between worker threads and the main process.
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CHALLENGE
const weakMap = new WeakMap();
const obj = {};
(function() {
const obj1 = { name: 'inner' };
weakMap.set(obj1, 'inner value');
})();
const result = weakMap.get(obj);
console.log(result);
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If you missed the Google I/O Angular session, you missed not only the latest updates on Angular but also the Generative Art Gallery demo which I had so much fun building. The demo has all of my favorite technologies, including AI, Angular and WebXR. It also was a very pleasant developer experience. Let me tell you why!
Ayลegรผl Yรถnet
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โค5๐3๐ฅ2
CHALLENGE
const weakMap = new WeakMap();
const obj = {};
const gen = (function* () {
yield 'value1';
yield 'value2';
})();
weakMap.set(obj, gen.next().value);
console.log(weakMap.get(obj));
console.log(gen.next().value);
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What is the output?
Anonymous Quiz
17%
Error
27%
"valie1", undefined
46%
"value1", "value2"
10%
"value2", "value2"
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I've always wanted to create a video series to share my experiences and work style as a remote software engineer. I finally started this journey and am excited to make more videos like this...
nairi
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CHALLENGE
const weakMap = new WeakMap();
const gen = (function* () {
yield { key: 'value1' };
yield { key: 'value2' };
})();
const obj1 = gen.next().value;
const obj2 = gen.next().value;
weakMap.set(obj1, 'stored value1');
weakMap.set(obj2, 'stored value2');
const result = [...gen].map(obj => weakMap.get(obj));
console.log(result);
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What is the output?
Anonymous Quiz
17%
[undefined, undefined]
17%
[]
58%
["stored value1", "stored value2"]
9%
[null, null]
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We often feature ECMAScript proposals that are in their later stages, but how about a brand new one you could get involved with? This one proposes an interesting additional bit of language syntax (`?=`) that returns a
[error, value] tuple from an assignment.Arthur Fiorette
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CHALLENGE
const weakMap = new WeakMap();
const array = [{}, {}];
array.forEach(obj => weakMap.set(obj, obj));
const result = array.map(obj => weakMap.get(obj) === obj);
console.log(result);
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Sponsored by Bryntum ๐ฎโโ๏ธ
World Class Web Components
โ CHALLENGE
World Class Web Components
const weakMap = new WeakMap();
const obj = {};
(function() {
const internalObj = {};
weakMap.set(internalObj, 'hidden');
obj.ref = internalObj;
})();
delete obj.ref;
const result = weakMap.has(obj.ref);
console.log(result);
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