I have a lot of data stored in associative array.

array = {'key':'value'};

How to loop throught an array like this using an normal for loop and not a loop like here: /

I don't want to use for-in because of this problems: Mootools when using For(...in Array) problem

I have a lot of data stored in associative array.

array = {'key':'value'};

How to loop throught an array like this using an normal for loop and not a loop like here: http://jsfiddle/HzLhe/

I don't want to use for-in because of this problems: Mootools when using For(...in Array) problem

• javascript
• arrays
• for-loop

Share Improve this question Follow edited May 23, 2017 at 12:00 CommunityBot 111 silver badge asked Apr 4, 2013 at 11:04 JacobJacob 4,0312323 gold badges9191 silver badges151151 bronze badges 7

• Why don't you like for .. in loop? – VisioN Commented Apr 4, 2013 at 11:05
• why not using for..in loop ..? – Sudhir Bastakoti Commented Apr 4, 2013 at 11:05
• It is messing with Mototools! stackoverflow./questions/7034837/… – Jacob Commented Apr 4, 2013 at 11:06
• @Jacob that is because you have to use the .hasOwnProperty method to filter out the prototype chains properties – Jeff Shaver Commented Apr 4, 2013 at 11:09
• @Jacob You are using object and not array. These elements are different in JavaScript. for .. in loop is the best to iterate objects. – VisioN Commented Apr 4, 2013 at 11:09

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2 Answers 2

Sorted by: Reset to default 8

As others have pointed out, this isn't an array. This is a JavaScript object. To iterate over it, you will have to use the for...in loop. But to filter out the other properties, youw ill have to use hasOwnProperty.

Example:

var obj={'key1': 'value1','key2':'value2'};

for (var index in obj) {
    if (!obj.hasOwnProperty(index)) {
        continue;
    }
    console.log(index);
    console.log(obj[index]);
}

http://jsfiddle/jeffshaver/HzLhe/3/

JavaScript does not have the concept of associative arrays. Instead you simply have an object with enumerable properties, so use a for..in loop to iterate through them. As stated above you may also want to perform a check with hasOwnProperty to ensure that you're not performing operations on inherited properties.

for (var prop in obj){
    if (obj.hasOwnProperty(prop)){
        console.log(obj[prop]);
    }
}