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| // Naive definition | |
| const Some = (v) => ({ | |
| val: v, | |
| map (f) { | |
| return Some(f(this.val)) | |
| }, | |
| chain (f) { | |
| return f(this.val) | |
| } |
73nko
/ useReducerWithLogger.js
Created
April 11, 2019 06:50
A Hook to implement a logger in console after each reducer action is dispatched
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| function enchanceDispatchWithLogger(dispatch) { | |
| return function (action) { | |
| console.groupCollapsed('Action Type:', action.type); | |
| return dispatch(action); | |
| } | |
| } | |
| function useReducerWithLogger(...args) { | |
| let prevState = useRef(initialState); | |
| const [state, dispatch] = useReducer(...args); |
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| const pipe = (...fns) => x => fns.reduce((v, f) => f(v), x); | |
| const fn1 = s => s.toLowerCase(); | |
| const fn2 = s => s.split('').reverse().join(''); | |
| const fn3 = s => s + '!' | |
| const newFunc = pipe(fn1, fn2, fn3); | |
| const result = newFunc('Time'); // emit! |
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| class IterableBackwards { | |
| constructor(xs) { | |
| this._xs = xs; | |
| this._i = xs.length; | |
| } | |
| [Symbol.iterator]() { return this; } | |
| next() { | |
| return (this._i <= 0) |
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| function* fib() { | |
| let a = 1, b = 0; | |
| for (; ;) { | |
| [a, b] = [b, a + b]; | |
| yield b; | |
| } | |
| } | |
| const f = fib(); | |
| for (let i = 0; i < 6; i++) |
73nko
/ hola-mundo
Created
May 29, 2019 13:50
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| [][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]][([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]](([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+ |
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| const isAnagram = (str1, str2) => { | |
| if (str1.length !== str2.length) return false; | |
| const map = new Map(); | |
| for (let char of str1) { | |
| const count = map.has(char) ? map.get(char) + 1 : 1; | |
| map.set(char, count); | |
| }; |
73nko
/ curved-text
Created
August 13, 2019 06:39
Saved from https://css-tricks.com/moving-text-on-a-curved-path/
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| const textPath = document.querySelector("#text-path"); | |
| const h = document.documentElement, | |
| b = document.body, | |
| st = 'scrollTop', | |
| sh = 'scrollHeight'; | |
| document.addEventListener("scroll", e => { | |
| let percent = (h[st]||b[st]) / ((h[sh]||b[sh]) - h.clientHeight) * 100; | |
| textPath.setAttribute("startOffset", (-percent * 40) + 1200) |
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| * { background-color: rgba(255,0,0,.2); } | |
| * * { background-color: rgba(0,255,0,.2); } | |
| * * * { background-color: rgba(0,0,255,.2); } | |
| * * * * { background-color: rgba(255,0,255,.2); } | |
| * * * * * { background-color: rgba(0,255,255,.2); } | |
| * * * * * * { background-color: rgba(255,255,0,.2); } | |
| * * * * * * * { background-color: rgba(255,0,0,.2); } | |
| * * * * * * * * { background-color: rgba(0,255,0,.2); } | |
| * * * * * * * * * { background-color: rgba(0,0,255,.2); } |
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| import { useEffect, useRef, useState } from "react"; | |
| export default ({ root = null, rootMargin, threshold = 0 }) => { | |
| const [entry, updateEntry] = useState({}); | |
| const [node, setNode] = useState(null); | |
| const observer = useRef( | |
| new window.IntersectionObserver(([entry]) => updateEntry(entry), { | |
| root, | |
| rootMargin, |