# 数组处理的另类需求

# 比较两个数组相等

先排序，再利用toString方法，比较。例如：

var a = [1,2,3];
var b = [1,2,3];
alert(a.sort().toString() == b.sort().toString());

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# 数组去重、获取重复数据以及获取非重复数据

返回顶部

# 数组去重

let arr = [11, 23, 26, 23, 11, 9];
const deduplication = arr => [...new Set(arr)];

console.log(deduplication(arr));  // [ 11, 23, 26, 9 ]

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# 保留数组中非重复数据

let arr = [11, 23, 26, 23, 11, 9];
const filterNonUnique = arr => arr.filter(i => arr.indexOf(i) === arr.lastIndexOf(i));

console.log(filterNonUnique(arr));  // [ 26, 9 ]

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# 保留数组中重复元素

let arr = [11, 23, 26, 23, 11, 9];
const filterUnique = arr => arr.filter(i => arr.indexOf(i) !== arr.lastIndexOf(i));

console.log(filterUnique(arr)); // [ 11, 23, 23, 11 ]

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