jonrandy
/ return_submit_ime.js
Created
July 3, 2026 03:55
How to handle 'enter' form submission WITHOUT breaking IME input (Korean, Japanese, Chinese etc.)
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| // put this in key event - key 229 is legacy (older browser send different 'key' for return while composing) | |
| if (e.isComposing || e.keyCode === 229) return; | |
| // safe to submit here if you want | |
| // https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/isComposing |
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| const all = async arr => { | |
| const results = [] | |
| for (p of arr) results.push(await p) | |
| return results | |
| } |
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| function makeFunction() { | |
| let myVar = 123 | |
| return function (s) { | |
| console.log(eval(s)) | |
| } | |
| } | |
| const func = makeFunction() |
jonrandy
/ hashmod.html
Created
April 8, 2025 06:45
HTML Hash Modules (self contained JS modules in an HTML file)
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| <!doctype html> | |
| <html lang="en"> | |
| <body> | |
| <script type="hash-module" id="sum"> | |
| export const sum = (a, b) => a + b; | |
| </script> | |
| <!-- All hash modules need to go before this script. --> | |
| <!-- This cant be a type="module", it must be executed immediately. --> | |
| <script> |
jonrandy
/ observePosition.js
Created
June 11, 2024 03:21
Observe Position Changes of an HTML Element
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| export function observePosition(element, callback) { | |
| const trackDiv = document.createElement("div") | |
| Object.assign(trackDiv.style, { | |
| position: "fixed", | |
| pointerEvents: "none", | |
| width: "2px", | |
| height: "2px", | |
| }) | |
| if (element.children.length) { | |
| element.insertBefore(trackDiv, element.firstChild) |
jonrandy
/ arrayNegativeIndexProxy.js
Created
May 31, 2024 11:22
Proxy an Array to allow negative indexes (like Array.at)
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| const arr = [1, 2, 3, 4] | |
| const handler = { | |
| get(target, prop, receiver) { | |
| // try to convert property to a number | |
| const n = +prop | |
| // if it's a number less than zero, return the correct item from the array | |
| if (!isNaN(n) && n<0) { | |
| return Reflect.get(target, target.length + n, receiver) | |
| // otherwise continue as normal with the property |
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| // pass in 2 letter country code | |
| const getFlagEmoji = countryCode=>String.fromCodePoint(...[...countryCode.toUpperCase()].map(x=>0x1f1a5+x.charCodeAt())) |
jonrandy
/ different_fibonacci.js
Last active
November 7, 2023 11:25
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| const fib = n => { | |
| const r5 = fib.r5 || (fib.r5=5**.5) | |
| return Math.floor((((1+r5)/2)**n - ((1-r5)/2)**n)/r5) | |
| } |
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| const isPalindrome = ([...s]) => ''+s == s.reverse() |
jonrandy
/ fast_fibonacci.js
Created
August 10, 2023 02:39
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| function fibonacci(n) { | |
| if (n < 0) throw RangeError("Negative arguments not implemented") | |
| return fib(n)[0] | |
| } | |
| function fib(n) { | |
| if (n) { | |
| const [a, b] = fib(~~(n / 2)), | |
| c = a * (b * 2n - a), | |
| d = a * a + b * b |
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