const newList = [1, 2, 3, 4, 5]
const list = [4, 5, 6, 7, 8]
const endIndex = newList.findIndex(item => item === list[0]) // -> 3
const diff = newList.slice(0, endIndex === -1 ? undefined : endIndex)
console.log([...diff, ...list]) // -> [1, 2, 3, 4, 5, 6, 7, 8]-
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Twitter で新しくツイートを取得する時に重複なしにがっちゃんこする
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