To run script
node index.js
Created
October 21, 2021 16:14
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Nylas Secret Santa
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| const getRandomIndex = (start,end) => { | |
| return Math.trunc(Math.random() * (end-start) + start); | |
| } | |
| const giftExchange = (arr)=>{ | |
| let length = arr.length; | |
| if (length <= 2) { | |
| throw new Error("Insufficient friends"); | |
| } | |
| let map = new Map(); | |
| while ([...map.entries()].length < length) { | |
| let gifter = arr.shift(); | |
| let index = getRandomIndex(0,arr.length-1); | |
| if ([...map.values()].includes(arr[index]) || map.get(arr[index]) === gifter){ | |
| arr.push(gifter); | |
| continue; | |
| } | |
| map.set(gifter,arr[index]); | |
| arr.push(gifter); | |
| } | |
| let output= ""; | |
| for (const [gifter,receiver] of map.entries()){ | |
| output+= `${gifter} gives a gift to ${receiver}\n`; | |
| } | |
| return output; | |
| } | |
| const run = () => { | |
| console.log(giftExchange(["Susan","Beth","Abe","Ardi", "Quan"])); | |
| console.log(giftExchange(["Susan","Beth","Abe","Ardi", "Quan","Nick","Tom","Hamsa","Helen"])); | |
| console.log(giftExchange(["Susan","Beth"])); | |
| } | |
| run() |
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