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27 lines
648 B
TypeScript
27 lines
648 B
TypeScript
// Loaded from https://deno.land/x/once/index.js
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/// <reference types="./index.d.ts" />
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/**
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* Create a function that calls and cache a function once
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* @template Return
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* @param {() => Return} fn Function to be invoked once
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* @returns {() => Return} Function that returns result of first-time execution of `fn`
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*
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* @example
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* import once from 'https://ksxgithub.github.io/deno-once/index.js'
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* const ran = once(Math.random)
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* console.log(ran() === ran()) // => true
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*/
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export function once (fn) {
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let main = () => {
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const value = fn()
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main = () => value
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return value
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}
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return () => main()
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}
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export default once
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