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数组去重方法 #17

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myheartwillgoon opened this issue Oct 23, 2018 · 0 comments

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myheartwillgoon commented Oct 23, 2018 •

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ES2015 Set

Array.from(new Set(arr))

filter 索引对比

arr.filter((item, index) => arr.indexOf(item) === index)

对象属性

const map = Object.create(null)
arr.filter(item => map[item] ? false : (map[item] = 1))

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