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@tomhicks
tomhicks / spoingyHeaders.ts
Created June 20, 2019 12:48
Bouncy header helper functions
import {Animated} from "react-native"
export function getSpoingyTransform(
scrollY: Animated.Value,
headerHeight: number,
) {
return [
{
translateY: scrollY.interpolate({
inputRange: [-headerHeight, 0, 1],
import * as React from "react"
import {captureScroll, getSpoingyTransform} from "spoingyHelpers"
import {Animated} from "react-native"
const headerHeight = 300
export default () => {
// use an instance variable if using component classes
const scrollY = React.useRef(new Animated.Value(0)).current
@tomhicks
tomhicks / plink-plonk.js
Last active July 22, 2024 09:51
Listen to your web pages
@tomhicks
tomhicks / sweep-swoop.js
Last active December 10, 2021 10:02
Listen to your web pages
const audioCtx = new window.AudioContext();
const oscillator = audioCtx.createOscillator();
oscillator.connect(audioCtx.destination);
oscillator.type = "sine";
let numItems = 0
oscillator.frequency.setValueAtTime(
1,
audioCtx.currentTime
@tomhicks
tomhicks / node-svm.cc
Created February 20, 2020 17:50
Node 12 node-svm fix
#include "node-svm.h"
#include "training-worker.h"
#include "prediction-worker.h"
#include "probability-prediction-worker.h"
using v8::FunctionTemplate;
using v8::Object;
using v8::String;
using v8::Array;
@tomhicks
tomhicks / InternalLink.tsx
Created July 24, 2020 11:09
Strongly-typed NextJS internal links
@tomhicks
tomhicks / useTaskQueue.ts
Created January 11, 2021 11:41
React Hook for queueing and processing async tasks sequentially
function useTaskQueue(params: {
shouldProcess: boolean
}): {
tasks: ReadonlyArray<Task>
isProcessing: boolean
addTask: (task: Task) => void
} {
const [queue, setQueue] = React.useState<{
isProcessing: boolean
tasks: Array<Task>
@tomhicks
tomhicks / useScreenShare.ts
Created March 17, 2021 11:20
How splitting useEffect calls simplifies code, and reduces bugs
// ATTEMPT 1 - everything in one useEffect
React.useEffect(() => {
if (screenVideoTrack) {
createScreenShareOffer()
} else {
// 🐞 called before share, on mount
revokeScreenShareOffer()
}
// 🐞 called even if screen was never shared
@tomhicks
tomhicks / promiseSequencer.ts
Last active July 5, 2022 08:50
Lets you continually push to a "stream" of promises, to be notified of their resolution/rejection, with the guarantee that the resolved values will be emitted in order, skipping any that come back out of order.
type PromiseSequencer<T> = {
/**
* Add a promise to the end of the queue. When this promise resolves, you
* may be notified via onLatest, assuming that no later promise has resolved
* in the meantime.
*/
push(promise: Promise<T>): void;
/**
* Remove all promises from the queue. Any promises in the queue can still
@tomhicks
tomhicks / ChakraColorModeComponents.tsx
Created August 7, 2022 10:35
SSR colorMode in Next.js with ChakraUI
import {ChakraProvider, useColorMode} from "@chakra-ui/react"
import {Html} from "next/document"
import React from "react"
type ColorMode = "light" | "dark"
export function ChakraThemedHtmlComponent(props: {
colorMode: ColorMode
children: React.ReactNode
}) {
return (