JS Array Remove duplicate data only one of the implementation code _javascript tips

Very little said, JS array to remove duplicate data from the code below:

var arr = [1,2,3,4,5,6,1,6,7,2];
var newArr = [];
for (var i =0;i<arr.length-1;i++) {
if (Newarr.indexof (arr[i)) = = 1) {
Newarr.push (arr[i]);
}
}

Here to share the high efficiency remove the JS array duplicates

The array type does not provide a way to repeat, if you want to kill the repeating elements of the array, you have to do it yourself:

function Unique (arr) {
var result = [], isrepeated;
for (var i = 0, len = arr.length i < len; i++) {
isrepeated = false;
for (var j = 0, Len = result.length J < Len; J + +) {
if (arr[i] = Result[j]) { 
isrepeated = true;
break;
}
}
if (!isrepeated) {
result.push (arr[i]);
}
return result;

The overall idea is to move the elements of the array to another array, the process of handling to check whether the element is duplicated, if there is a direct throw away. It can be seen from nested loops that this method is extremely inefficient. We can use a Hashtable structure to record existing elements so that the inner loops can be avoided. Exactly, implementing Hashtable in JavaScript is extremely simple, as follows:

function Unique (arr) {
var result = [], hash = {};
for (var i = 0, elem; (Elem = arr[i])!= null; i++) {
if (!hash[elem]) {
result.push (elem);
Hash[elem] = true;
}
}
return result;
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}

The above is a small set to introduce the JS array to remove duplicate data only one of the implementation code, hope to help everyone, if you have any questions please give me a message, small series will promptly reply to everyone. Here also thank you very much for the cloud Habitat Community website support!