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davidsharp/reorder.js

Created November 13, 2020 16:19
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move an item in an array up or down by an amount
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reorder.js
const reorder = (array, index, moveBy) => {
let temp = array.map((c,i)=>([c,i]))
temp[index][1]=temp[index][1]+moveBy+(moveBy>0?.5:-.5)
return temp.sort((a,b)=>a[1]-b[1]).map(c=>c[0])
}
@davidsharp

davidsharp commented Nov 13, 2020

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Works like reorder([1,2,3,4,5],2,-1) => [ 1, 3, 2, 4, 5 ]

Limits an items maximum movement to the the top or bottom (ie, no overflow/underflow) "for free"

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