JavaScript methods for removing array duplicates based on objects _javascript tips

The examples in this article describe the way JavaScript removes array duplicates based on objects. Share to everyone for your reference, specific as follows:

In JavaScript, removing an array of duplicates is a very common function and is often asked in interviews. Many people in the face of this problem, the general is to use a multi-level for loop to step by step comparison, and then delete, so not only the amount of code, And the performance is also very bad. In JavaScript objects, one feature is that the key never repeats, and if it repeats, it overwrites the front.

Three steps:

To convert an array to a JS object
2# the value of the array into the key in the JS object
3# restores an object to a group

var toobject = function (arr) {
    var obj = new Object ();//Private Object
    var j = arr.length;
    for (Var i=0 i < J; +i+) {
        Obj[arr[i]] = true;
    }
    return obj;
}
var keys = function (obj) {
    var arr = [];
    for (var attr in obj) {
        if (Obj.hasownperpoty (attr)) {
            arr.push (attr);
        }
    }
    return arr;
}
var uniq = function (arr) {//Remove duplicates return
    keys (Toobject (Newarr));
}

In use, the array passed to the Uniq function can be, this method uses JavaScript object features, very efficient and concise, but also the bottom of the Yahoo Yui implementation.

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I hope this article will help you with JavaScript programming.