es6 filter() 数组过滤方法总结（转载）

1.创建一个数组，判断数组中是否存在某个值

var newarr = [

  { num: 1, val: 'ceshi', flag: 'aa' },

  { num: 2, val: 'ceshi2', flag: 'aa2'  }

]

console.log(newarr.filter(item => item.num===2 ))

2.也可以通过上面方法过滤掉num为2的留下num为1的

var newarr = [

  { num: 1, val: 'ceshi', flag: 'aa' },

  { num: 2, val: 'ceshi2', flag: 'aa2'  }

]

console.log(newarr.filter(item => item.num!=2 ))

3.去掉空数组空字符串、undefined、null

var arr = ['1','2',undefined, '3.jpg',undefined]

var newArr = arr.filter(item => item)

console.log(newArr)

var arr = ['1','2',null, '3.jpg',null]

var newArr = arr.filter(item => item)

console.log(newArr)

>//空字符串里面不能包含空格

var arr = ['1','2','', '3.jpg','']

var newArr = arr.filter(item => item)

console.log(newArr)

4.去掉数组中不符合项

var arr = [20,30,50, 96,50]

var newArr = arr.filter(item => item>40)

console.log(newArr)

5.过滤不符合项

var arr = ['10','12','23','44','42']

var newArr = arr.filter(item => item.indexOf('2')<0)

console.log(newArr)

6.数组去重

var arr = [1, 2, 2, 3, 4, 5, 5, 6, 7, 7,8,8,0,8,6,3,4,56,2];

var arr2 = arr.filter((x, index,self)=>self.indexOf(x)===index)

console.log(arr2); //[1, 2, 3, 4, 5, 6, 7, 8, 0, 56]

7.数组去重es6

var arr=[1,2,1,'1',null,null,undefined,undefined,NaN,NaN]

let res=Array.from(new Set(arr));//{1,2,"1",null,undefined,NaN}

//or

let newarr=[...new Set(arr)]

8.数组对象去重es6

let person = [

     {id: 0, name: "小明"},

     {id: 1, name: "小张"},

     {id: 2, name: "小李"},

     {id: 3, name: "小孙"},

     {id: 1, name: "小周"},

     {id: 2, name: "小陈"},

];

let obj = {};

let peon = person.reduce((cur,next) => {

    obj[next.id] ? "" : obj[next.id] = true && cur.push(next);

    return cur;

},[]) //设置cur默认类型为数组，并且初始值为空的数组

console.log(peon);

// (4) [{…}, {…}, {…}, {…}]0: {id: 0, name: "小明"}1: {id: 1, name: "小张"}2: {id: 2, name: "小李"}3: {id: 3, name: "小孙"}length: 4__proto__: Array(0)

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es6 filter() 数组过滤方法总结（转载）

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