如何将关联数组连接到字符串中

Question

I am trying to do this now and I wonder if there is a "the most used" method to join an associative array (it's values) into a string, delimited by a character.

For example, I have

var AssocArray = { id:0, status:false, text:'apple' };

The string resulted from joining the elements of this object will be

"0, false, 'apple'" or "0, 0, 'apple'"

if we join them with a "," character Any idea? Thanks!

Answer 1

Object.keys(AssocArray).map(function(x){return AssocArray[x];}).join(',');

PS: there is Object.values method somewhere, but it's not a standard. And there are also external libraries like hashish .

Answer 2

Just loop through the array. Any array in JavaScript has indices, even associative arrays:

    var AssocArray = { id:0, status:false, text:'apple' };
    var s = "";
    for (var i in AssocArray) {
       s += AssocArray[i] + ", ";
    }
    document.write(s.substring(0, s.length-2));

Will output: 0, false, apple

Answer 3

The implementation of functions like Object.map , Object.forEach and so on is still being discussed. For now, you can stick with something like this:

function objectJoin(obj, sep) {
    var arr = [], p, i = 0;
    for (p in obj)
        arr[i++] = obj[p];
    return arr.join(sep);
}

Edit : using a temporary array and joining it instead of string concatenation for performance improvement.

Edit 2 : it seems that arr.push(obj[p]); instead of incrementing a counter can actually be faster in most of recent browsers. See comments.