CHALLENGE ❓
const map = new Map();
map.set("key", undefined);
console.log(map.has("key"), map.get("key"));
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What is the output?
Anonymous Quiz
21%
false, undefined
18%
true, null
7%
false, null
54%
true, undefined
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Given plain text containing things like links, hashtags, IP addresses, and email addresses, this will generate the correct code to display it on the Web.
Hypercontext
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CHALLENGE ❓
class MyClass {
constructor() {
this.a = 10;
}
}
MyClass.prototype.b = 20;
const obj = new MyClass();
delete obj.b;
console.log(obj.b);
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🤔17👍7❤2
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CHALLENGE
const symbol1 = Symbol('desc1');
const symbol2 = Symbol('desc2');
const myObject = {};
myObject[symbol1] = 'Value1';
myObject[symbol2] = 'Value2';
let output = '';
for (let key in myObject) {
output += myObject[key] + ' ';
}
output += Object.getOwnPropertySymbols(myObject).length;
console.log(output);👍8❤4
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CHALLENGE
const numbers = [2, 4, 6, 8];
const sum = numbers.reduce((acc, num) => acc + num, 0);
console.log(sum);
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CHALLENGE
var obj = {
a: 10,
b: 20,
c: 'hello'
};
with (obj) {
var sum = a + b;
var greeting = c + ' world';
}
console.log(sum, greeting);👍15🔥2🤩2
What is the output?
Anonymous Quiz
81%
30 'hello world'
6%
30 'hello'
5%
'hello world' 30
9%
undefined 'hello world'
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It’s a modest milestone, but Node v22.12.0 (LTS) has been released and marks Node’s first LTS release with non-flagged support for loading native ES modules with require(). It’s still experimental, though, and you’re encouraged to send in feedback and bug reports.
Sarah Gooding
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CHALLENGE
let a = 5; // binary: 0101
let b = 3; // binary: 0011
let result = a & b;
console.log(result);
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libvips is a popular, highly efficient image processing library written in C. You can use it via Sharp in Node.js, but this offers a more isomorphic route for use in Node, Deno, and modern browsers by way of WebAssembly. (There's a nifty online demo here.)
Kleis Auke Wolthuizen
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CHALLENGE
const defaultSettings = {
theme: 'light',
notifications: true,
location: 'USA'
};
const userSettings = {
theme: 'dark',
location: 'Canada'
};
const finalSettings = {
...defaultSettings,
...userSettings
};
console.log(finalSettings);👍17❤3
Under development for several years, Boa has a few missions: be a Rust ECMAScript implementation, be easy to embed in Rust projects, and be a fast, safe JS engine overall. v0.20 sees a bump up to 89.92% compliance in the Test262 suite, improves Temporal support, adds Atomics.pause, and more. This is no toy engine.
Boa Developers
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