A popular Processing-inspired creative coding library that makes it easy to create interactive, visual experiences (examples). v2.0 improves its font support, adds more ways to draw and manipulate text, adds a way to write shaders in JavaScript, and much more. p5.js 2.0: You Are Here has more details on the release and where the project is headed next.
p5.js Team
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CHALLENGE
function* counter() {
let i = 0;
while (true) {
const direction = yield i;
if (direction === 'up') i += 2;
else if (direction === 'down') i -= 1;
else i += 1;
}
}
const count = counter();
console.log(count.next().value);
console.log(count.next('up').value);
console.log(count.next('down').value);
console.log(count.next().value);A split-flap display is a electro-mechanical display commonly associated with live timetable displays and it makes for a neat effect on the Web too. Jhey breaks down how to replicate it, or you can hit up this live demo.
Jhey Tompkins
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CHALLENGE
function* genSequence() {
const result = yield 'first';
console.log(result);
yield* [1, 2];
return 'done';
}
const gen = genSequence();
let next = gen.next('ignored');
console.log(next.value);
next = gen.next('second');
next = gen.next();
console.log(next.value);
next = gen.next();
console.log(next);A surprisingly featureful control for letting users pick fonts from a range of system fonts, Google fonts, and custom fonts of your choice. You can play with a code demo here or go to the GitHub repo.
Zygomatic
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CHALLENGE
function Animal(name) {
this.name = name;
}
Animal.prototype.getName = function() {
return this.name;
};
function Dog(name, breed) {
Animal.call(this, name);
this.breed = breed;
}
Dog.prototype = Object.create(Animal.prototype);
Dog.prototype.constructor = Dog;
Dog.prototype.getName = function() {
return `Dog called ${Animal.prototype.getName.call(this)}`;
};
const myDog = new Dog('Rex', 'German Shepherd');
console.log(myDog.getName());Koa first appeared over a decade ago as a ‘next-generation’ Web framework that shared some of the lineage (and team) of Express.js, but leaning on more modern JavaScript features and ideas of the time. While Express has been making a comeback recently, Koa has progressed too and offers a compelling alternative. v3.0 release notes.
Koa contributors
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CHALLENGE
const obj = {
value: 42,
getValue() {
return this.value;
},
getValueArrow: () => this.value,
nested: {
value: 100,
getValue() {
return this.value;
}
}
};
const extractedMethod = obj.getValue;
const boundMethod = obj.getValue.bind(obj);
console.log(obj.getValue() + ',' + obj.getValueArrow() + ',' +
obj.nested.getValue() + ',' + extractedMethod() + ',' +
boundMethod());What is the output?
Anonymous Quiz
34%
42,42,100,42,42
29%
42,undefined,100,42,42
16%
undefined,undefined,100,undefined,42
21%
42,undefined,100,undefined,42
I've been dabbling with a little C# recently and enjoyed this TypeScript is Like C# guide oriented largely around showing TypeScript/JavaScript/com.JavaScript vs C# examples of doing the same things.
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CHALLENGE
const target = { a: 1, b: 2 };
const handler = {
get(obj, prop) {
return prop === 'sum' ? obj.a + obj.b : Reflect.get(obj, prop);
},
set(obj, prop, value) {
if (prop === 'a' && value < 0) {
return false;
}
return Reflect.set(obj, prop, value);
}
};
const proxy = new Proxy(target, handler);
proxy.a = -5;
proxy.b = 10;
console.log(`${proxy.a}, ${proxy.b}, ${proxy.sum}`);What is the output?
Anonymous Quiz
31%
-5, 10, 5
37%
undefined, 10, NaN
19%
-5, 10, NaN
14%
1, 10, 11
Last year the popular GSAP (a.k.a. GreenSock) animation library was acquired by Webflow and as of this new version the entire GSAP toolkit is freely available (including formerly paid addons like MorphSVG and SplitText) even for commercial use. If you're unfamiliar with GSAP and want to see some of what it can do, they have a showcase, lots of code demos, and amazing docs.
Cassie Evans and Jack Doyle
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CHALLENGE
const obj = {
value: 10,
getValue() {
return this.value;
},
getArrowValue: () => {
return this.value;
},
getMixedValue() {
const regular = function() { return this.value; };
const arrow = () => this.value;
return [regular(), arrow()];
}
};
console.log(obj.getMixedValue());What is the output?
Anonymous Quiz
20%
[undefined, undefined]
32%
[10, undefined]
27%
[undefined, 10]
21%
[10, 10]
Google Apps Script is a JavaScript-based platform for dynamically automating tasks in all sorts of Google apps. Here’s how to use it to bring Google Analytics data into a Google Sheet.
Kayce Basques
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CHALLENGE
const obj = {
value: 42,
getValue() {
return this.value;
},
getArrowValue: () => {
return this.value;
},
getDelayedValue() {
setTimeout(function() {
console.log(this.value);
}, 0);
},
getFixedDelayedValue() {
setTimeout(() => {
console.log(this.value);
}, 0);
}
};
obj.getDelayedValue();