Loop through object get value using regex key matches Javascript

Question

var obj = {
 Fname1: \"John\",
 Lname1: \"Smith\",
 Age1: \"23\",
 Fname2: \"Jerry\",
 Lname2: \"Smith\",
 Age2: \"24\"
}

with an object like this.

Answer 1

Yes, sure you can. Here's how:

for(var key in obj) {
    if(/^Fname/.test(key))
        ... do something with obj[key]
}

This was the regex way, but for simple stuff, you may want to use indexOf(). How? Here's how:

for(var key in obj) {
    if(key.indexOf('Fname') == 0) // or any other index.
        ... do something with obj[key]
}

And if you want to do something with a list of attributes, i mean that you want values of all the attributes, you may use an array to store those attributes, match them using regex/indexOf - whatever convenient - and do something with those values...I'd leave this task to you.