CHALLENGE
const sym1 = Symbol('description');
const sym2 = Symbol('description');
const obj = {
[sym1]: 'value1',
[sym2]: 'value2'
};
console.log(obj[sym1]);👍8🔥3❤1
🤣16👍9🤔4❤1
Think the GitHub contributions heat map. No dependencies, small, responsive, and theme-able. There’s a live demo or its GitHub repo.
William Troup
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👍11🔥5❤3
CHALLENGE
function trickyScope() {
var x = 10;
if (true) {
let x = 5;
console.log(x);
}
console.log(x);
}
trickyScope();🔥9❤4
🔥10🤔7👍5🤣5❤3
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👍6❤3🔥3
CHALLENGE
function trickyScope() {
var a = 10;
let b = 20;
const c = 30;
if (true) {
var a = 40;
let b = 50;
const c = 60;
console.log(a, b, c);
}
console.log(a, b, c);
}
trickyScope();👍18🤣8❤6🤔2
What is the output?
Anonymous Quiz
12%
40 50 60 10 50 60
29%
40 50 60 40 20 30
50%
40 50 60 10 20 30
9%
40 50 60 40 50 30
❤19👍11🔥6
CHALLENGE
function trickyFunction(num) {
let result = 0;
for (let i = 0; i < num; i++) {
result += i;
if (i % 2 === 0) {
result *= 2;
} else {
result -= 1;
}
}
return result;
}
console.log(trickyFunction(4));👍7❤2🔥1
🤔30👍16❤2🔥2
I know this sounds like a geographical piece, but this developer’s curiosity led to a fun blend of JavaScript and the always useful Overpass Turbo mapping tool.
Ivan Ludvig
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👍5❤4🔥1
CHALLENGE
function trickyScope() {
let x = 10;
if (true) {
let x = 20;
console.log(x); // A
}
console.log(x); // B
{
let x = 30;
console.log(x); // C
}
console.log(x); // D
}
trickyScope();🔥9👍4❤1
What is the output?
Anonymous Quiz
19%
10, 20, 30, 10
65%
20, 10, 30, 10
12%
20, 20, 30, 10
5%
10, 10, 30, 10
👍23🤔5❤3🔥3🤣2
framework comes a new way to build LLM-powered agents that perform various tasks, use knowledge bases, and hold memory. Think a meta-framework like Next.js but for AI agents. GitHub repo.
Mastra
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❤8👍2🔥2🤔2
CHALLENGE
function trickyQuestion() {
var a = 1;
var b = 2;
return (function() {
delete a;
delete b;
return a + b;
})();
}
console.log(trickyQuestion());🤔11👍5
🤔30🔥11❤5👍3🤣3
Node supports WeakMap and WeakRef for working with weak references and James is a big fan of the extra abstractions they unlock. A weak reference differs from a normal reference in that it doesn’t prevent a referenced object from being garbage collected – this might sound like it has limited value, but is quite useful in certain scenarios.
James Long
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❤7👍4🔥1
CHALLENGE
let a = 5; // binary: 0101
let b = 3; // binary: 0011
let c = a & b; // binary: 0001
let d = a | b; // binary: 0111
let e = a ^ b; // binary: 0110
console.log(c, d, e);
👍7
🤣23🤔13👍10❤3