mirror of
https://github.com/leporello-js/leporello-js
synced 2026-01-13 13:04:30 -08:00
39 lines
800 B
JavaScript
39 lines
800 B
JavaScript
const fib = n => {
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if(n == 0) {
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return 0
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}
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if(n == 1) {
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return 1
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}
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return fib(n - 1) + fib(n - 2)
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}
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/* external */
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import {h, render} from 'https://unpkg.com/preact?module';
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/* external */
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import {Stateful} from './stateful.js'
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const Counter = Stateful({
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getInitialState: () => ({index: 0}),
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handlers: {
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prev: ({index}) => ({index: index - 1}),
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next: ({index}) => ({index: index + 1}),
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},
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render: (props, state, handlers) =>
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h('div', null,
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h('h1', null,
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'nth Fibonacci number is ',
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fib(state.index),
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' for n = ',
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state.index
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),
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h('button', {onClick: handlers.prev}, 'Previous'), ' ',
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h('button', {onClick: handlers.next}, 'Next'), ' ',
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)
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})
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render(h(Counter), globalThis.document.body)
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