JS数组去重，删除对象属性

1.数组去重
var arr = ['apple','strawberry','banana','pear','apple','orange','orange','strawberry'];
 var r = arr.filter(function(element,index,self){
    return self.indexOf(element) === index;
  });
 console.log(r);      

2.删除对象属性

var arr={

    a:1,

    b:2

  };

  delete arr.b;

  console.log(arr)