JS code to remove duplicates from two arrays_javascript skills

The first type:

Copy code The code is as follows:

function unique (arr){
var obj = {},newArr = [];
for(var i = 0;i < arr.length;i ){
var value = arr[i];
if(!obj [value]){
obj[value] = 1;
newArr.push(value);
}
}
return newArr;
}

This method stores the value of the array into the object. Therefore, when the array contains object members, the operation fails (the object as the key of the object will be converted into a string).
Second method:

Copy code The code is as follows:

function unique (arr ){
for(var i = 0;i < arr.length;i ){
for(var j = i 1;j < arr.length;j ){
if(arr[ i] === arr[j]){
arr.splice(j,1);
j--}
}
}
return arr;
}

This method is supported even if the incoming array contains objects. Note the '===', but using nested loops, the performance will be worse than the first method.