// by Arnauld - https://codegolf.stackexchange.com/users/58563/arnauldf=(n,a=b=1,p)=>n?''.padEnd(p)+a+`+${b}=${b+=a}
`+f(n-1,b-a,(a+"").length-~p):''
console.log(f(20))
Great golfed solution to this question at codegolf stackexchange by user Arnauld
const stepBetweenA = (min, max, steps) =>
Array(steps).fill(0).reduce((prev, curr, i) => {
prev.push(min + ((max - min) / (steps - 1)) * i)
return prev}, [])
const stepBetweenB = (min, max, steps) => {
steps -= 1
const diff = (max - min) / steps
const result = [min]
for (let i = 0; i < steps; i++) {
result.push(min += diff)
} return result}console.log('a', stepBetweenA(10, 110, 4))
console.log('b', stepBetweenB(10, 110, 4))
const ITER = 10000
console.time('a')
for (let i = 0; i < ITER; i++) {
stepBetweenA(10, 110, 4)
}console.timeEnd('a')
console.time('b')
for (let i = 0; i < ITER; i++) {
stepBetweenB(10, 110, 4)
}console.timeEnd('b')
Two messy implementations for stepping between two numbers… I am not sure it’s possible to make console.time work well with the snippet zone quick editor – so if you want to see the times… open your console.
function hamming(a, b) {
const leng = a.length
let dist = 0
// strings need to be same lengthif (leng != b.length) return -1;
a = a.toLowerCase()
b = b.toLowerCase()
for (let i = 0; i < leng; i++)
if (a[i] !== b[i]) dist++
return dist}console.log(hamming('zevan', 'kevin'))
console.log(hamming('joe', 'joe'))
console.log(hamming('john', 'jake'))
The hamming distance between two strings…
let anchorslet idxlet leng = 10
let size = 200
let px = 0
let py = 0
function seed() {
idx = 0
anchors = (Date.now() + '').split``
.reverse()
.map(v => parseFloat(v) / 10)
.splice(0, leng)
}let last = 0
let zoom = 1
function rand() {
if (idx > size * size) seed()
px += zoompy += ~~(px / size)
if (px >= size) px = 0
if (py >= size) py = 0
const point = {
x: anchors[idx % leng],
y: anchors[(idx + 1) % leng]
} idx++let dists = []
for (let i = 0; i < anchors.length; i += 2) {
let dx = px - anchors[i] * size
let dy = py - anchors[i + 1] * size
dists.push(Math.sqrt(dx * dx + dy * dy))
}dists.sort()
last += (dists[0] / size - last) / 4
return last}seed()
let d = document
let b = d.body
with (b.appendChild(
Object.assign(d.createElement`canvas`, { width: 400, height: 400 })
).getContext`2d`) {
fillStyle = 'black'
fillRect(0, 0, 400, 400)
for (let i = 0; i < 200; i++) {
for (let j = 0; j < 200; j++) {
const c = rand() * 255
fillStyle = `rgb(${c}, ${c}, ${c})`
fillRect(j * 2, i * 2, 1, 2)
} }}Another one for genuary “Create your own pseudo-random number generator and visually check the results.”
const canvas = document.body.appendChild(
document.createElement('canvas')
);
const c = canvas.getContext('2d');
function resize() {
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
draw();
}function draw() {
c.clearRect(0, 0, canvas.width, canvas.height);
Math.min(window.innerWidth, window.innerHeight) * 0.0015;
const iter = 300,
halfWidth = window.innerWidth / 2,
halfHeight = window.innerHeight / 2;
let rad = 50, rad2 = 50, theta = 0, x, y;
let x2, y2;
for (let i = 0; i < 100; i++) {
c.fillStyle = 'blue';
x = halfWidth + rad * Math.cos(theta);
y = halfHeight + rad * Math.sin(theta);
c.fillRect(x, y, 5, 5);
c.fillStyle = 'red';
rad2 = 80 + rad * Math.cos(theta * 3);
x2 = halfWidth + rad2 * Math.cos(theta);
y2 = halfHeight + rad2 * Math.sin(theta);
c.fillRect(x2, y2, 5, 5);
c.fillStyle = 'green';
c.fillRect((x2 + x) / 2, (y2 + y) / 2, 5, 5);
theta += .1;
}}resize();
window.addEventListener('resize', resize);