join array enclosing each value with quotes javascript

How can join an array into a string and at the same time enclosing each value into this

'1/2/12','15/5/12'

for (var i in array) {
    dateArray.push(array[i].date);
}
dateString=dateArray.join('');
console.log(dateString);

If your dates are already strings, you can do the following

var dates = ['1/2/12','15/5/12'];

console.log("'" + dates.join("','") + "'");

However, a cooler and more foolproof way (for the case with no dates) way would be Array.prototype.map

// Array.prototype.map returns a new array by 
// mapping each element in the existing array
dates.map(function(date){
    // Wrap each element of the dates array with quotes
    return "'" + date + "'";
}).join(","); // Putsa comma in between every element

Or in es6 lingo

dates.map(date => `'${date}'`).join(',');

http://jsfiddle.net/yMvVh/

ES6:

var dates = ['1/2/12','15/5/12'];
var result = dates.map(d => `'${d}'`).join(',');
console.log(result);

dateString = '\'' + dateArray.join('\',\'') + '\'';

demo: http://jsfiddle.net/mLRMb/